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egs/ljspeech/TTS/matcha_tts/hifigan/LICENSE

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+MIT License
+
+Copyright (c) 2020 Jungil Kong
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

egs/ljspeech/TTS/matcha_tts/hifigan/README.md

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+# HiFi-GAN: Generative Adversarial Networks for Efficient and High Fidelity Speech Synthesis
+
+### Jungil Kong, Jaehyeon Kim, Jaekyoung Bae
+
+In our [paper](https://arxiv.org/abs/2010.05646),
+we proposed HiFi-GAN: a GAN-based model capable of generating high fidelity speech efficiently.<br/>
+We provide our implementation and pretrained models as open source in this repository.
+
+**Abstract :**
+Several recent work on speech synthesis have employed generative adversarial networks (GANs) to produce raw waveforms.
+Although such methods improve the sampling efficiency and memory usage,
+their sample quality has not yet reached that of autoregressive and flow-based generative models.
+In this work, we propose HiFi-GAN, which achieves both efficient and high-fidelity speech synthesis.
+As speech audio consists of sinusoidal signals with various periods,
+we demonstrate that modeling periodic patterns of an audio is crucial for enhancing sample quality.
+A subjective human evaluation (mean opinion score, MOS) of a single speaker dataset indicates that our proposed method
+demonstrates similarity to human quality while generating 22.05 kHz high-fidelity audio 167.9 times faster than
+real-time on a single V100 GPU. We further show the generality of HiFi-GAN to the mel-spectrogram inversion of unseen
+speakers and end-to-end speech synthesis. Finally, a small footprint version of HiFi-GAN generates samples 13.4 times
+faster than real-time on CPU with comparable quality to an autoregressive counterpart.
+
+Visit our [demo website](https://jik876.github.io/hifi-gan-demo/) for audio samples.
+
+## Pre-requisites
+
+1. Python >= 3.6
+2. Clone this repository.
+3. Install python requirements. Please refer [requirements.txt](requirements.txt)
+4. Download and extract the [LJ Speech dataset](https://keithito.com/LJ-Speech-Dataset/).
+   And move all wav files to `LJSpeech-1.1/wavs`
+
+## Training
+
+```
+python train.py --config config_v1.json
+```
+
+To train V2 or V3 Generator, replace `config_v1.json` with `config_v2.json` or `config_v3.json`.<br>
+Checkpoints and copy of the configuration file are saved in `cp_hifigan` directory by default.<br>
+You can change the path by adding `--checkpoint_path` option.
+
+Validation loss during training with V1 generator.<br>
+![validation loss](./validation_loss.png)
+
+## Pretrained Model
+
+You can also use pretrained models we provide.<br/>
+[Download pretrained models](https://drive.google.com/drive/folders/1-eEYTB5Av9jNql0WGBlRoi-WH2J7bp5Y?usp=sharing)<br/>
+Details of each folder are as in follows:
+
+| Folder Name  | Generator | Dataset   | Fine-Tuned                                             |
+| ------------ | --------- | --------- | ------------------------------------------------------ |
+| LJ_V1        | V1        | LJSpeech  | No                                                     |
+| LJ_V2        | V2        | LJSpeech  | No                                                     |
+| LJ_V3        | V3        | LJSpeech  | No                                                     |
+| LJ_FT_T2_V1  | V1        | LJSpeech  | Yes ([Tacotron2](https://github.com/NVIDIA/tacotron2)) |
+| LJ_FT_T2_V2  | V2        | LJSpeech  | Yes ([Tacotron2](https://github.com/NVIDIA/tacotron2)) |
+| LJ_FT_T2_V3  | V3        | LJSpeech  | Yes ([Tacotron2](https://github.com/NVIDIA/tacotron2)) |
+| VCTK_V1      | V1        | VCTK      | No                                                     |
+| VCTK_V2      | V2        | VCTK      | No                                                     |
+| VCTK_V3      | V3        | VCTK      | No                                                     |
+| UNIVERSAL_V1 | V1        | Universal | No                                                     |
+
+We provide the universal model with discriminator weights that can be used as a base for transfer learning to other datasets.
+
+## Fine-Tuning
+
+1. Generate mel-spectrograms in numpy format using [Tacotron2](https://github.com/NVIDIA/tacotron2) with teacher-forcing.<br/>
+   The file name of the generated mel-spectrogram should match the audio file and the extension should be `.npy`.<br/>
+   Example:
+   `   Audio File : LJ001-0001.wav
+Mel-Spectrogram File : LJ001-0001.npy`
+2. Create `ft_dataset` folder and copy the generated mel-spectrogram files into it.<br/>
+3. Run the following command.
+   ```
+   python train.py --fine_tuning True --config config_v1.json
+   ```
+   For other command line options, please refer to the training section.
+
+## Inference from wav file
+
+1. Make `test_files` directory and copy wav files into the directory.
+2. Run the following command.
+   `   python inference.py --checkpoint_file [generator checkpoint file path]`
+   Generated wav files are saved in `generated_files` by default.<br>
+   You can change the path by adding `--output_dir` option.
+
+## Inference for end-to-end speech synthesis
+
+1. Make `test_mel_files` directory and copy generated mel-spectrogram files into the directory.<br>
+   You can generate mel-spectrograms using [Tacotron2](https://github.com/NVIDIA/tacotron2),
+   [Glow-TTS](https://github.com/jaywalnut310/glow-tts) and so forth.
+2. Run the following command.
+   `   python inference_e2e.py --checkpoint_file [generator checkpoint file path]`
+   Generated wav files are saved in `generated_files_from_mel` by default.<br>
+   You can change the path by adding `--output_dir` option.
+
+## Acknowledgements
+
+We referred to [WaveGlow](https://github.com/NVIDIA/waveglow), [MelGAN](https://github.com/descriptinc/melgan-neurips)
+and [Tacotron2](https://github.com/NVIDIA/tacotron2) to implement this.

egs/ljspeech/TTS/matcha_tts/hifigan/config.py

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+v1 = {
+    "resblock": "1",
+    "num_gpus": 0,
+    "batch_size": 16,
+    "learning_rate": 0.0004,
+    "adam_b1": 0.8,
+    "adam_b2": 0.99,
+    "lr_decay": 0.999,
+    "seed": 1234,
+    "upsample_rates": [8, 8, 2, 2],
+    "upsample_kernel_sizes": [16, 16, 4, 4],
+    "upsample_initial_channel": 512,
+    "resblock_kernel_sizes": [3, 7, 11],
+    "resblock_dilation_sizes": [[1, 3, 5], [1, 3, 5], [1, 3, 5]],
+    "resblock_initial_channel": 256,
+    "segment_size": 8192,
+    "num_mels": 80,
+    "num_freq": 1025,
+    "n_fft": 1024,
+    "hop_size": 256,
+    "win_size": 1024,
+    "sampling_rate": 22050,
+    "fmin": 0,
+    "fmax": 8000,
+    "fmax_loss": None,
+    "num_workers": 4,
+    "dist_config": {"dist_backend": "nccl", "dist_url": "tcp://localhost:54321", "world_size": 1},
+}

egs/ljspeech/TTS/matcha_tts/hifigan/denoiser.py

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+# Code modified from Rafael Valle's implementation https://github.com/NVIDIA/waveglow/blob/5bc2a53e20b3b533362f974cfa1ea0267ae1c2b1/denoiser.py
+
+"""Waveglow style denoiser can be used to remove the artifacts from the HiFiGAN generated audio."""
+import torch
+
+
+class Denoiser(torch.nn.Module):
+    """Removes model bias from audio produced with waveglow"""
+
+    def __init__(self, vocoder, filter_length=1024, n_overlap=4, win_length=1024, mode="zeros"):
+        super().__init__()
+        self.filter_length = filter_length
+        self.hop_length = int(filter_length / n_overlap)
+        self.win_length = win_length
+
+        dtype, device = next(vocoder.parameters()).dtype, next(vocoder.parameters()).device
+        self.device = device
+        if mode == "zeros":
+            mel_input = torch.zeros((1, 80, 88), dtype=dtype, device=device)
+        elif mode == "normal":
+            mel_input = torch.randn((1, 80, 88), dtype=dtype, device=device)
+        else:
+            raise Exception(f"Mode {mode} if not supported")
+
+        def stft_fn(audio, n_fft, hop_length, win_length, window):
+            spec = torch.stft(
+                audio,
+                n_fft=n_fft,
+                hop_length=hop_length,
+                win_length=win_length,
+                window=window,
+                return_complex=True,
+            )
+            spec = torch.view_as_real(spec)
+            return torch.sqrt(spec.pow(2).sum(-1)), torch.atan2(spec[..., -1], spec[..., 0])
+
+        self.stft = lambda x: stft_fn(
+            audio=x,
+            n_fft=self.filter_length,
+            hop_length=self.hop_length,
+            win_length=self.win_length,
+            window=torch.hann_window(self.win_length, device=device),
+        )
+        self.istft = lambda x, y: torch.istft(
+            torch.complex(x * torch.cos(y), x * torch.sin(y)),
+            n_fft=self.filter_length,
+            hop_length=self.hop_length,
+            win_length=self.win_length,
+            window=torch.hann_window(self.win_length, device=device),
+        )
+
+        with torch.no_grad():
+            bias_audio = vocoder(mel_input).float().squeeze(0)
+            bias_spec, _ = self.stft(bias_audio)
+
+        self.register_buffer("bias_spec", bias_spec[:, :, 0][:, :, None])
+
+    @torch.inference_mode()
+    def forward(self, audio, strength=0.0005):
+        audio_spec, audio_angles = self.stft(audio)
+        audio_spec_denoised = audio_spec - self.bias_spec.to(audio.device) * strength
+        audio_spec_denoised = torch.clamp(audio_spec_denoised, 0.0)
+        audio_denoised = self.istft(audio_spec_denoised, audio_angles)
+        return audio_denoised

egs/ljspeech/TTS/matcha_tts/hifigan/env.py

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+""" from https://github.com/jik876/hifi-gan """
+
+import os
+import shutil
+
+
+class AttrDict(dict):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.__dict__ = self
+
+
+def build_env(config, config_name, path):
+    t_path = os.path.join(path, config_name)
+    if config != t_path:
+        os.makedirs(path, exist_ok=True)
+        shutil.copyfile(config, os.path.join(path, config_name))

egs/ljspeech/TTS/matcha_tts/hifigan/meldataset.py

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+""" from https://github.com/jik876/hifi-gan """
+
+import math
+import os
+import random
+
+import numpy as np
+import torch
+import torch.utils.data
+from librosa.filters import mel as librosa_mel_fn
+from librosa.util import normalize
+from scipy.io.wavfile import read
+
+MAX_WAV_VALUE = 32768.0
+
+
+def load_wav(full_path):
+    sampling_rate, data = read(full_path)
+    return data, sampling_rate
+
+
+def dynamic_range_compression(x, C=1, clip_val=1e-5):
+    return np.log(np.clip(x, a_min=clip_val, a_max=None) * C)
+
+
+def dynamic_range_decompression(x, C=1):
+    return np.exp(x) / C
+
+
+def dynamic_range_compression_torch(x, C=1, clip_val=1e-5):
+    return torch.log(torch.clamp(x, min=clip_val) * C)
+
+
+def dynamic_range_decompression_torch(x, C=1):
+    return torch.exp(x) / C
+
+
+def spectral_normalize_torch(magnitudes):
+    output = dynamic_range_compression_torch(magnitudes)
+    return output
+
+
+def spectral_de_normalize_torch(magnitudes):
+    output = dynamic_range_decompression_torch(magnitudes)
+    return output
+
+
+mel_basis = {}
+hann_window = {}
+
+
+def mel_spectrogram(y, n_fft, num_mels, sampling_rate, hop_size, win_size, fmin, fmax, center=False):
+    if torch.min(y) < -1.0:
+        print("min value is ", torch.min(y))
+    if torch.max(y) > 1.0:
+        print("max value is ", torch.max(y))
+
+    global mel_basis, hann_window  # pylint: disable=global-statement
+    if fmax not in mel_basis:
+        mel = librosa_mel_fn(sampling_rate, n_fft, num_mels, fmin, fmax)
+        mel_basis[str(fmax) + "_" + str(y.device)] = torch.from_numpy(mel).float().to(y.device)
+        hann_window[str(y.device)] = torch.hann_window(win_size).to(y.device)
+
+    y = torch.nn.functional.pad(
+        y.unsqueeze(1), (int((n_fft - hop_size) / 2), int((n_fft - hop_size) / 2)), mode="reflect"
+    )
+    y = y.squeeze(1)
+
+    spec = torch.view_as_real(
+        torch.stft(
+            y,
+            n_fft,
+            hop_length=hop_size,
+            win_length=win_size,
+            window=hann_window[str(y.device)],
+            center=center,
+            pad_mode="reflect",
+            normalized=False,
+            onesided=True,
+            return_complex=True,
+        )
+    )
+
+    spec = torch.sqrt(spec.pow(2).sum(-1) + (1e-9))
+
+    spec = torch.matmul(mel_basis[str(fmax) + "_" + str(y.device)], spec)
+    spec = spectral_normalize_torch(spec)
+
+    return spec
+
+
+def get_dataset_filelist(a):
+    with open(a.input_training_file, encoding="utf-8") as fi:
+        training_files = [
+            os.path.join(a.input_wavs_dir, x.split("|")[0] + ".wav") for x in fi.read().split("\n") if len(x) > 0
+        ]
+
+    with open(a.input_validation_file, encoding="utf-8") as fi:
+        validation_files = [
+            os.path.join(a.input_wavs_dir, x.split("|")[0] + ".wav") for x in fi.read().split("\n") if len(x) > 0
+        ]
+    return training_files, validation_files
+
+
+class MelDataset(torch.utils.data.Dataset):
+    def __init__(
+        self,
+        training_files,
+        segment_size,
+        n_fft,
+        num_mels,
+        hop_size,
+        win_size,
+        sampling_rate,
+        fmin,
+        fmax,
+        split=True,
+        shuffle=True,
+        n_cache_reuse=1,
+        device=None,
+        fmax_loss=None,
+        fine_tuning=False,
+        base_mels_path=None,
+    ):
+        self.audio_files = training_files
+        random.seed(1234)
+        if shuffle:
+            random.shuffle(self.audio_files)
+        self.segment_size = segment_size
+        self.sampling_rate = sampling_rate
+        self.split = split
+        self.n_fft = n_fft
+        self.num_mels = num_mels
+        self.hop_size = hop_size
+        self.win_size = win_size
+        self.fmin = fmin
+        self.fmax = fmax
+        self.fmax_loss = fmax_loss
+        self.cached_wav = None
+        self.n_cache_reuse = n_cache_reuse
+        self._cache_ref_count = 0
+        self.device = device
+        self.fine_tuning = fine_tuning
+        self.base_mels_path = base_mels_path
+
+    def __getitem__(self, index):
+        filename = self.audio_files[index]
+        if self._cache_ref_count == 0:
+            audio, sampling_rate = load_wav(filename)
+            audio = audio / MAX_WAV_VALUE
+            if not self.fine_tuning:
+                audio = normalize(audio) * 0.95
+            self.cached_wav = audio
+            if sampling_rate != self.sampling_rate:
+                raise ValueError(f"{sampling_rate} SR doesn't match target {self.sampling_rate} SR")
+            self._cache_ref_count = self.n_cache_reuse
+        else:
+            audio = self.cached_wav
+            self._cache_ref_count -= 1
+
+        audio = torch.FloatTensor(audio)
+        audio = audio.unsqueeze(0)
+
+        if not self.fine_tuning:
+            if self.split:
+                if audio.size(1) >= self.segment_size:
+                    max_audio_start = audio.size(1) - self.segment_size
+                    audio_start = random.randint(0, max_audio_start)
+                    audio = audio[:, audio_start : audio_start + self.segment_size]
+                else:
+                    audio = torch.nn.functional.pad(audio, (0, self.segment_size - audio.size(1)), "constant")
+
+            mel = mel_spectrogram(
+                audio,
+                self.n_fft,
+                self.num_mels,
+                self.sampling_rate,
+                self.hop_size,
+                self.win_size,
+                self.fmin,
+                self.fmax,
+                center=False,
+            )
+        else:
+            mel = np.load(os.path.join(self.base_mels_path, os.path.splitext(os.path.split(filename)[-1])[0] + ".npy"))
+            mel = torch.from_numpy(mel)
+
+            if len(mel.shape) < 3:
+                mel = mel.unsqueeze(0)
+
+            if self.split:
+                frames_per_seg = math.ceil(self.segment_size / self.hop_size)
+
+                if audio.size(1) >= self.segment_size:
+                    mel_start = random.randint(0, mel.size(2) - frames_per_seg - 1)
+                    mel = mel[:, :, mel_start : mel_start + frames_per_seg]
+                    audio = audio[:, mel_start * self.hop_size : (mel_start + frames_per_seg) * self.hop_size]
+                else:
+                    mel = torch.nn.functional.pad(mel, (0, frames_per_seg - mel.size(2)), "constant")
+                    audio = torch.nn.functional.pad(audio, (0, self.segment_size - audio.size(1)), "constant")
+
+        mel_loss = mel_spectrogram(
+            audio,
+            self.n_fft,
+            self.num_mels,
+            self.sampling_rate,
+            self.hop_size,
+            self.win_size,
+            self.fmin,
+            self.fmax_loss,
+            center=False,
+        )
+
+        return (mel.squeeze(), audio.squeeze(0), filename, mel_loss.squeeze())
+
+    def __len__(self):
+        return len(self.audio_files)

egs/ljspeech/TTS/matcha_tts/hifigan/models.py

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+""" from https://github.com/jik876/hifi-gan """
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from torch.nn import AvgPool1d, Conv1d, Conv2d, ConvTranspose1d
+from torch.nn.utils import remove_weight_norm, spectral_norm, weight_norm
+
+from .xutils import get_padding, init_weights
+
+LRELU_SLOPE = 0.1
+
+
+class ResBlock1(torch.nn.Module):
+    def __init__(self, h, channels, kernel_size=3, dilation=(1, 3, 5)):
+        super().__init__()
+        self.h = h
+        self.convs1 = nn.ModuleList(
+            [
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=dilation[0],
+                        padding=get_padding(kernel_size, dilation[0]),
+                    )
+                ),
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=dilation[1],
+                        padding=get_padding(kernel_size, dilation[1]),
+                    )
+                ),
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=dilation[2],
+                        padding=get_padding(kernel_size, dilation[2]),
+                    )
+                ),
+            ]
+        )
+        self.convs1.apply(init_weights)
+
+        self.convs2 = nn.ModuleList(
+            [
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=1,
+                        padding=get_padding(kernel_size, 1),
+                    )
+                ),
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=1,
+                        padding=get_padding(kernel_size, 1),
+                    )
+                ),
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=1,
+                        padding=get_padding(kernel_size, 1),
+                    )
+                ),
+            ]
+        )
+        self.convs2.apply(init_weights)
+
+    def forward(self, x):
+        for c1, c2 in zip(self.convs1, self.convs2):
+            xt = F.leaky_relu(x, LRELU_SLOPE)
+            xt = c1(xt)
+            xt = F.leaky_relu(xt, LRELU_SLOPE)
+            xt = c2(xt)
+            x = xt + x
+        return x
+
+    def remove_weight_norm(self):
+        for l in self.convs1:
+            remove_weight_norm(l)
+        for l in self.convs2:
+            remove_weight_norm(l)
+
+
+class ResBlock2(torch.nn.Module):
+    def __init__(self, h, channels, kernel_size=3, dilation=(1, 3)):
+        super().__init__()
+        self.h = h
+        self.convs = nn.ModuleList(
+            [
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=dilation[0],
+                        padding=get_padding(kernel_size, dilation[0]),
+                    )
+                ),
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=dilation[1],
+                        padding=get_padding(kernel_size, dilation[1]),
+                    )
+                ),
+            ]
+        )
+        self.convs.apply(init_weights)
+
+    def forward(self, x):
+        for c in self.convs:
+            xt = F.leaky_relu(x, LRELU_SLOPE)
+            xt = c(xt)
+            x = xt + x
+        return x
+
+    def remove_weight_norm(self):
+        for l in self.convs:
+            remove_weight_norm(l)
+
+
+class Generator(torch.nn.Module):
+    def __init__(self, h):
+        super().__init__()
+        self.h = h
+        self.num_kernels = len(h.resblock_kernel_sizes)
+        self.num_upsamples = len(h.upsample_rates)
+        self.conv_pre = weight_norm(Conv1d(80, h.upsample_initial_channel, 7, 1, padding=3))
+        resblock = ResBlock1 if h.resblock == "1" else ResBlock2
+
+        self.ups = nn.ModuleList()
+        for i, (u, k) in enumerate(zip(h.upsample_rates, h.upsample_kernel_sizes)):
+            self.ups.append(
+                weight_norm(
+                    ConvTranspose1d(
+                        h.upsample_initial_channel // (2**i),
+                        h.upsample_initial_channel // (2 ** (i + 1)),
+                        k,
+                        u,
+                        padding=(k - u) // 2,
+                    )
+                )
+            )
+
+        self.resblocks = nn.ModuleList()
+        for i in range(len(self.ups)):
+            ch = h.upsample_initial_channel // (2 ** (i + 1))
+            for _, (k, d) in enumerate(zip(h.resblock_kernel_sizes, h.resblock_dilation_sizes)):
+                self.resblocks.append(resblock(h, ch, k, d))
+
+        self.conv_post = weight_norm(Conv1d(ch, 1, 7, 1, padding=3))
+        self.ups.apply(init_weights)
+        self.conv_post.apply(init_weights)
+
+    def forward(self, x):
+        x = self.conv_pre(x)
+        for i in range(self.num_upsamples):
+            x = F.leaky_relu(x, LRELU_SLOPE)
+            x = self.ups[i](x)
+            xs = None
+            for j in range(self.num_kernels):
+                if xs is None:
+                    xs = self.resblocks[i * self.num_kernels + j](x)
+                else:
+                    xs += self.resblocks[i * self.num_kernels + j](x)
+            x = xs / self.num_kernels
+        x = F.leaky_relu(x)
+        x = self.conv_post(x)
+        x = torch.tanh(x)
+
+        return x
+
+    def remove_weight_norm(self):
+        print("Removing weight norm...")
+        for l in self.ups:
+            remove_weight_norm(l)
+        for l in self.resblocks:
+            l.remove_weight_norm()
+        remove_weight_norm(self.conv_pre)
+        remove_weight_norm(self.conv_post)
+
+
+class DiscriminatorP(torch.nn.Module):
+    def __init__(self, period, kernel_size=5, stride=3, use_spectral_norm=False):
+        super().__init__()
+        self.period = period
+        norm_f = weight_norm if use_spectral_norm is False else spectral_norm
+        self.convs = nn.ModuleList(
+            [
+                norm_f(Conv2d(1, 32, (kernel_size, 1), (stride, 1), padding=(get_padding(5, 1), 0))),
+                norm_f(Conv2d(32, 128, (kernel_size, 1), (stride, 1), padding=(get_padding(5, 1), 0))),
+                norm_f(Conv2d(128, 512, (kernel_size, 1), (stride, 1), padding=(get_padding(5, 1), 0))),
+                norm_f(Conv2d(512, 1024, (kernel_size, 1), (stride, 1), padding=(get_padding(5, 1), 0))),
+                norm_f(Conv2d(1024, 1024, (kernel_size, 1), 1, padding=(2, 0))),
+            ]
+        )
+        self.conv_post = norm_f(Conv2d(1024, 1, (3, 1), 1, padding=(1, 0)))
+
+    def forward(self, x):
+        fmap = []
+
+        # 1d to 2d
+        b, c, t = x.shape
+        if t % self.period != 0:  # pad first
+            n_pad = self.period - (t % self.period)
+            x = F.pad(x, (0, n_pad), "reflect")
+            t = t + n_pad
+        x = x.view(b, c, t // self.period, self.period)
+
+        for l in self.convs:
+            x = l(x)
+            x = F.leaky_relu(x, LRELU_SLOPE)
+            fmap.append(x)
+        x = self.conv_post(x)
+        fmap.append(x)
+        x = torch.flatten(x, 1, -1)
+
+        return x, fmap
+
+
+class MultiPeriodDiscriminator(torch.nn.Module):
+    def __init__(self):
+        super().__init__()
+        self.discriminators = nn.ModuleList(
+            [
+                DiscriminatorP(2),
+                DiscriminatorP(3),
+                DiscriminatorP(5),
+                DiscriminatorP(7),
+                DiscriminatorP(11),
+            ]
+        )
+
+    def forward(self, y, y_hat):
+        y_d_rs = []
+        y_d_gs = []
+        fmap_rs = []
+        fmap_gs = []
+        for _, d in enumerate(self.discriminators):
+            y_d_r, fmap_r = d(y)
+            y_d_g, fmap_g = d(y_hat)
+            y_d_rs.append(y_d_r)
+            fmap_rs.append(fmap_r)
+            y_d_gs.append(y_d_g)
+            fmap_gs.append(fmap_g)
+
+        return y_d_rs, y_d_gs, fmap_rs, fmap_gs
+
+
+class DiscriminatorS(torch.nn.Module):
+    def __init__(self, use_spectral_norm=False):
+        super().__init__()
+        norm_f = weight_norm if use_spectral_norm is False else spectral_norm
+        self.convs = nn.ModuleList(
+            [
+                norm_f(Conv1d(1, 128, 15, 1, padding=7)),
+                norm_f(Conv1d(128, 128, 41, 2, groups=4, padding=20)),
+                norm_f(Conv1d(128, 256, 41, 2, groups=16, padding=20)),
+                norm_f(Conv1d(256, 512, 41, 4, groups=16, padding=20)),
+                norm_f(Conv1d(512, 1024, 41, 4, groups=16, padding=20)),
+                norm_f(Conv1d(1024, 1024, 41, 1, groups=16, padding=20)),
+                norm_f(Conv1d(1024, 1024, 5, 1, padding=2)),
+            ]
+        )
+        self.conv_post = norm_f(Conv1d(1024, 1, 3, 1, padding=1))
+
+    def forward(self, x):
+        fmap = []
+        for l in self.convs:
+            x = l(x)
+            x = F.leaky_relu(x, LRELU_SLOPE)
+            fmap.append(x)
+        x = self.conv_post(x)
+        fmap.append(x)
+        x = torch.flatten(x, 1, -1)
+
+        return x, fmap
+
+
+class MultiScaleDiscriminator(torch.nn.Module):
+    def __init__(self):
+        super().__init__()
+        self.discriminators = nn.ModuleList(
+            [
+                DiscriminatorS(use_spectral_norm=True),
+                DiscriminatorS(),
+                DiscriminatorS(),
+            ]
+        )
+        self.meanpools = nn.ModuleList([AvgPool1d(4, 2, padding=2), AvgPool1d(4, 2, padding=2)])
+
+    def forward(self, y, y_hat):
+        y_d_rs = []
+        y_d_gs = []
+        fmap_rs = []
+        fmap_gs = []
+        for i, d in enumerate(self.discriminators):
+            if i != 0:
+                y = self.meanpools[i - 1](y)
+                y_hat = self.meanpools[i - 1](y_hat)
+            y_d_r, fmap_r = d(y)
+            y_d_g, fmap_g = d(y_hat)
+            y_d_rs.append(y_d_r)
+            fmap_rs.append(fmap_r)
+            y_d_gs.append(y_d_g)
+            fmap_gs.append(fmap_g)
+
+        return y_d_rs, y_d_gs, fmap_rs, fmap_gs
+
+
+def feature_loss(fmap_r, fmap_g):
+    loss = 0
+    for dr, dg in zip(fmap_r, fmap_g):
+        for rl, gl in zip(dr, dg):
+            loss += torch.mean(torch.abs(rl - gl))
+
+    return loss * 2
+
+
+def discriminator_loss(disc_real_outputs, disc_generated_outputs):
+    loss = 0
+    r_losses = []
+    g_losses = []
+    for dr, dg in zip(disc_real_outputs, disc_generated_outputs):
+        r_loss = torch.mean((1 - dr) ** 2)
+        g_loss = torch.mean(dg**2)
+        loss += r_loss + g_loss
+        r_losses.append(r_loss.item())
+        g_losses.append(g_loss.item())
+
+    return loss, r_losses, g_losses
+
+
+def generator_loss(disc_outputs):
+    loss = 0
+    gen_losses = []
+    for dg in disc_outputs:
+        l = torch.mean((1 - dg) ** 2)
+        gen_losses.append(l)
+        loss += l
+
+    return loss, gen_losses

egs/ljspeech/TTS/matcha_tts/hifigan/xutils.py

@@ -0,0 +1,60 @@
+""" from https://github.com/jik876/hifi-gan """
+
+import glob
+import os
+
+import matplotlib
+import torch
+from torch.nn.utils import weight_norm
+
+matplotlib.use("Agg")
+import matplotlib.pylab as plt
+
+
+def plot_spectrogram(spectrogram):
+    fig, ax = plt.subplots(figsize=(10, 2))
+    im = ax.imshow(spectrogram, aspect="auto", origin="lower", interpolation="none")
+    plt.colorbar(im, ax=ax)
+
+    fig.canvas.draw()
+    plt.close()
+
+    return fig
+
+
+def init_weights(m, mean=0.0, std=0.01):
+    classname = m.__class__.__name__
+    if classname.find("Conv") != -1:
+        m.weight.data.normal_(mean, std)
+
+
+def apply_weight_norm(m):
+    classname = m.__class__.__name__
+    if classname.find("Conv") != -1:
+        weight_norm(m)
+
+
+def get_padding(kernel_size, dilation=1):
+    return int((kernel_size * dilation - dilation) / 2)
+
+
+def load_checkpoint(filepath, device):
+    assert os.path.isfile(filepath)
+    print(f"Loading '{filepath}'")
+    checkpoint_dict = torch.load(filepath, map_location=device)
+    print("Complete.")
+    return checkpoint_dict
+
+
+def save_checkpoint(filepath, obj):
+    print(f"Saving checkpoint to {filepath}")
+    torch.save(obj, filepath)
+    print("Complete.")
+
+
+def scan_checkpoint(cp_dir, prefix):
+    pattern = os.path.join(cp_dir, prefix + "????????")
+    cp_list = glob.glob(pattern)
+    if len(cp_list) == 0:
+        return None
+    return sorted(cp_list)[-1]

egs/ljspeech/TTS/matcha_tts/models/baselightningmodule.py

@@ -0,0 +1,210 @@
+"""
+This is a base lightning module that can be used to train a model.
+The benefit of this abstraction is that all the logic outside of model definition can be reused for different models.
+"""
+import inspect
+from abc import ABC
+from typing import Any, Dict
+
+import torch
+from lightning import LightningModule
+from lightning.pytorch.utilities import grad_norm
+
+from matcha import utils
+from matcha.utils.utils import plot_tensor
+
+log = utils.get_pylogger(__name__)
+
+
+class BaseLightningClass(LightningModule, ABC):
+    def update_data_statistics(self, data_statistics):
+        if data_statistics is None:
+            data_statistics = {
+                "mel_mean": 0.0,
+                "mel_std": 1.0,
+            }
+
+        self.register_buffer("mel_mean", torch.tensor(data_statistics["mel_mean"]))
+        self.register_buffer("mel_std", torch.tensor(data_statistics["mel_std"]))
+
+    def configure_optimizers(self) -> Any:
+        optimizer = self.hparams.optimizer(params=self.parameters())
+        if self.hparams.scheduler not in (None, {}):
+            scheduler_args = {}
+            # Manage last epoch for exponential schedulers
+            if "last_epoch" in inspect.signature(self.hparams.scheduler.scheduler).parameters:
+                if hasattr(self, "ckpt_loaded_epoch"):
+                    current_epoch = self.ckpt_loaded_epoch - 1
+                else:
+                    current_epoch = -1
+
+            scheduler_args.update({"optimizer": optimizer})
+            scheduler = self.hparams.scheduler.scheduler(**scheduler_args)
+            scheduler.last_epoch = current_epoch
+            return {
+                "optimizer": optimizer,
+                "lr_scheduler": {
+                    "scheduler": scheduler,
+                    "interval": self.hparams.scheduler.lightning_args.interval,
+                    "frequency": self.hparams.scheduler.lightning_args.frequency,
+                    "name": "learning_rate",
+                },
+            }
+
+        return {"optimizer": optimizer}
+
+    def get_losses(self, batch):
+        x, x_lengths = batch["x"], batch["x_lengths"]
+        y, y_lengths = batch["y"], batch["y_lengths"]
+        spks = batch["spks"]
+
+        dur_loss, prior_loss, diff_loss, *_ = self(
+            x=x,
+            x_lengths=x_lengths,
+            y=y,
+            y_lengths=y_lengths,
+            spks=spks,
+            out_size=self.out_size,
+            durations=batch["durations"],
+        )
+        return {
+            "dur_loss": dur_loss,
+            "prior_loss": prior_loss,
+            "diff_loss": diff_loss,
+        }
+
+    def on_load_checkpoint(self, checkpoint: Dict[str, Any]) -> None:
+        self.ckpt_loaded_epoch = checkpoint["epoch"]  # pylint: disable=attribute-defined-outside-init
+
+    def training_step(self, batch: Any, batch_idx: int):
+        loss_dict = self.get_losses(batch)
+        self.log(
+            "step",
+            float(self.global_step),
+            on_step=True,
+            prog_bar=True,
+            logger=True,
+            sync_dist=True,
+        )
+
+        self.log(
+            "sub_loss/train_dur_loss",
+            loss_dict["dur_loss"],
+            on_step=True,
+            on_epoch=True,
+            logger=True,
+            sync_dist=True,
+        )
+        self.log(
+            "sub_loss/train_prior_loss",
+            loss_dict["prior_loss"],
+            on_step=True,
+            on_epoch=True,
+            logger=True,
+            sync_dist=True,
+        )
+        self.log(
+            "sub_loss/train_diff_loss",
+            loss_dict["diff_loss"],
+            on_step=True,
+            on_epoch=True,
+            logger=True,
+            sync_dist=True,
+        )
+
+        total_loss = sum(loss_dict.values())
+        self.log(
+            "loss/train",
+            total_loss,
+            on_step=True,
+            on_epoch=True,
+            logger=True,
+            prog_bar=True,
+            sync_dist=True,
+        )
+
+        return {"loss": total_loss, "log": loss_dict}
+
+    def validation_step(self, batch: Any, batch_idx: int):
+        loss_dict = self.get_losses(batch)
+        self.log(
+            "sub_loss/val_dur_loss",
+            loss_dict["dur_loss"],
+            on_step=True,
+            on_epoch=True,
+            logger=True,
+            sync_dist=True,
+        )
+        self.log(
+            "sub_loss/val_prior_loss",
+            loss_dict["prior_loss"],
+            on_step=True,
+            on_epoch=True,
+            logger=True,
+            sync_dist=True,
+        )
+        self.log(
+            "sub_loss/val_diff_loss",
+            loss_dict["diff_loss"],
+            on_step=True,
+            on_epoch=True,
+            logger=True,
+            sync_dist=True,
+        )
+
+        total_loss = sum(loss_dict.values())
+        self.log(
+            "loss/val",
+            total_loss,
+            on_step=True,
+            on_epoch=True,
+            logger=True,
+            prog_bar=True,
+            sync_dist=True,
+        )
+
+        return total_loss
+
+    def on_validation_end(self) -> None:
+        if self.trainer.is_global_zero:
+            one_batch = next(iter(self.trainer.val_dataloaders))
+            if self.current_epoch == 0:
+                log.debug("Plotting original samples")
+                for i in range(2):
+                    y = one_batch["y"][i].unsqueeze(0).to(self.device)
+                    self.logger.experiment.add_image(
+                        f"original/{i}",
+                        plot_tensor(y.squeeze().cpu()),
+                        self.current_epoch,
+                        dataformats="HWC",
+                    )
+
+            log.debug("Synthesising...")
+            for i in range(2):
+                x = one_batch["x"][i].unsqueeze(0).to(self.device)
+                x_lengths = one_batch["x_lengths"][i].unsqueeze(0).to(self.device)
+                spks = one_batch["spks"][i].unsqueeze(0).to(self.device) if one_batch["spks"] is not None else None
+                output = self.synthesise(x[:, :x_lengths], x_lengths, n_timesteps=10, spks=spks)
+                y_enc, y_dec = output["encoder_outputs"], output["decoder_outputs"]
+                attn = output["attn"]
+                self.logger.experiment.add_image(
+                    f"generated_enc/{i}",
+                    plot_tensor(y_enc.squeeze().cpu()),
+                    self.current_epoch,
+                    dataformats="HWC",
+                )
+                self.logger.experiment.add_image(
+                    f"generated_dec/{i}",
+                    plot_tensor(y_dec.squeeze().cpu()),
+                    self.current_epoch,
+                    dataformats="HWC",
+                )
+                self.logger.experiment.add_image(
+                    f"alignment/{i}",
+                    plot_tensor(attn.squeeze().cpu()),
+                    self.current_epoch,
+                    dataformats="HWC",
+                )
+
+    def on_before_optimizer_step(self, optimizer):
+        self.log_dict({f"grad_norm/{k}": v for k, v in grad_norm(self, norm_type=2).items()})

egs/ljspeech/TTS/matcha_tts/models/components/decoder.py

@@ -0,0 +1,443 @@
+import math
+from typing import Optional
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from conformer import ConformerBlock
+from diffusers.models.activations import get_activation
+from einops import pack, rearrange, repeat
+
+from matcha.models.components.transformer import BasicTransformerBlock
+
+
+class SinusoidalPosEmb(torch.nn.Module):
+    def __init__(self, dim):
+        super().__init__()
+        self.dim = dim
+        assert self.dim % 2 == 0, "SinusoidalPosEmb requires dim to be even"
+
+    def forward(self, x, scale=1000):
+        if x.ndim < 1:
+            x = x.unsqueeze(0)
+        device = x.device
+        half_dim = self.dim // 2
+        emb = math.log(10000) / (half_dim - 1)
+        emb = torch.exp(torch.arange(half_dim, device=device).float() * -emb)
+        emb = scale * x.unsqueeze(1) * emb.unsqueeze(0)
+        emb = torch.cat((emb.sin(), emb.cos()), dim=-1)
+        return emb
+
+
+class Block1D(torch.nn.Module):
+    def __init__(self, dim, dim_out, groups=8):
+        super().__init__()
+        self.block = torch.nn.Sequential(
+            torch.nn.Conv1d(dim, dim_out, 3, padding=1),
+            torch.nn.GroupNorm(groups, dim_out),
+            nn.Mish(),
+        )
+
+    def forward(self, x, mask):
+        output = self.block(x * mask)
+        return output * mask
+
+
+class ResnetBlock1D(torch.nn.Module):
+    def __init__(self, dim, dim_out, time_emb_dim, groups=8):
+        super().__init__()
+        self.mlp = torch.nn.Sequential(nn.Mish(), torch.nn.Linear(time_emb_dim, dim_out))
+
+        self.block1 = Block1D(dim, dim_out, groups=groups)
+        self.block2 = Block1D(dim_out, dim_out, groups=groups)
+
+        self.res_conv = torch.nn.Conv1d(dim, dim_out, 1)
+
+    def forward(self, x, mask, time_emb):
+        h = self.block1(x, mask)
+        h += self.mlp(time_emb).unsqueeze(-1)
+        h = self.block2(h, mask)
+        output = h + self.res_conv(x * mask)
+        return output
+
+
+class Downsample1D(nn.Module):
+    def __init__(self, dim):
+        super().__init__()
+        self.conv = torch.nn.Conv1d(dim, dim, 3, 2, 1)
+
+    def forward(self, x):
+        return self.conv(x)
+
+
+class TimestepEmbedding(nn.Module):
+    def __init__(
+        self,
+        in_channels: int,
+        time_embed_dim: int,
+        act_fn: str = "silu",
+        out_dim: int = None,
+        post_act_fn: Optional[str] = None,
+        cond_proj_dim=None,
+    ):
+        super().__init__()
+
+        self.linear_1 = nn.Linear(in_channels, time_embed_dim)
+
+        if cond_proj_dim is not None:
+            self.cond_proj = nn.Linear(cond_proj_dim, in_channels, bias=False)
+        else:
+            self.cond_proj = None
+
+        self.act = get_activation(act_fn)
+
+        if out_dim is not None:
+            time_embed_dim_out = out_dim
+        else:
+            time_embed_dim_out = time_embed_dim
+        self.linear_2 = nn.Linear(time_embed_dim, time_embed_dim_out)
+
+        if post_act_fn is None:
+            self.post_act = None
+        else:
+            self.post_act = get_activation(post_act_fn)
+
+    def forward(self, sample, condition=None):
+        if condition is not None:
+            sample = sample + self.cond_proj(condition)
+        sample = self.linear_1(sample)
+
+        if self.act is not None:
+            sample = self.act(sample)
+
+        sample = self.linear_2(sample)
+
+        if self.post_act is not None:
+            sample = self.post_act(sample)
+        return sample
+
+
+class Upsample1D(nn.Module):
+    """A 1D upsampling layer with an optional convolution.
+
+    Parameters:
+        channels (`int`):
+            number of channels in the inputs and outputs.
+        use_conv (`bool`, default `False`):
+            option to use a convolution.
+        use_conv_transpose (`bool`, default `False`):
+            option to use a convolution transpose.
+        out_channels (`int`, optional):
+            number of output channels. Defaults to `channels`.
+    """
+
+    def __init__(self, channels, use_conv=False, use_conv_transpose=True, out_channels=None, name="conv"):
+        super().__init__()
+        self.channels = channels
+        self.out_channels = out_channels or channels
+        self.use_conv = use_conv
+        self.use_conv_transpose = use_conv_transpose
+        self.name = name
+
+        self.conv = None
+        if use_conv_transpose:
+            self.conv = nn.ConvTranspose1d(channels, self.out_channels, 4, 2, 1)
+        elif use_conv:
+            self.conv = nn.Conv1d(self.channels, self.out_channels, 3, padding=1)
+
+    def forward(self, inputs):
+        assert inputs.shape[1] == self.channels
+        if self.use_conv_transpose:
+            return self.conv(inputs)
+
+        outputs = F.interpolate(inputs, scale_factor=2.0, mode="nearest")
+
+        if self.use_conv:
+            outputs = self.conv(outputs)
+
+        return outputs
+
+
+class ConformerWrapper(ConformerBlock):
+    def __init__(  # pylint: disable=useless-super-delegation
+        self,
+        *,
+        dim,
+        dim_head=64,
+        heads=8,
+        ff_mult=4,
+        conv_expansion_factor=2,
+        conv_kernel_size=31,
+        attn_dropout=0,
+        ff_dropout=0,
+        conv_dropout=0,
+        conv_causal=False,
+    ):
+        super().__init__(
+            dim=dim,
+            dim_head=dim_head,
+            heads=heads,
+            ff_mult=ff_mult,
+            conv_expansion_factor=conv_expansion_factor,
+            conv_kernel_size=conv_kernel_size,
+            attn_dropout=attn_dropout,
+            ff_dropout=ff_dropout,
+            conv_dropout=conv_dropout,
+            conv_causal=conv_causal,
+        )
+
+    def forward(
+        self,
+        hidden_states,
+        attention_mask,
+        encoder_hidden_states=None,
+        encoder_attention_mask=None,
+        timestep=None,
+    ):
+        return super().forward(x=hidden_states, mask=attention_mask.bool())
+
+
+class Decoder(nn.Module):
+    def __init__(
+        self,
+        in_channels,
+        out_channels,
+        channels=(256, 256),
+        dropout=0.05,
+        attention_head_dim=64,
+        n_blocks=1,
+        num_mid_blocks=2,
+        num_heads=4,
+        act_fn="snake",
+        down_block_type="transformer",
+        mid_block_type="transformer",
+        up_block_type="transformer",
+    ):
+        super().__init__()
+        channels = tuple(channels)
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+
+        self.time_embeddings = SinusoidalPosEmb(in_channels)
+        time_embed_dim = channels[0] * 4
+        self.time_mlp = TimestepEmbedding(
+            in_channels=in_channels,
+            time_embed_dim=time_embed_dim,
+            act_fn="silu",
+        )
+
+        self.down_blocks = nn.ModuleList([])
+        self.mid_blocks = nn.ModuleList([])
+        self.up_blocks = nn.ModuleList([])
+
+        output_channel = in_channels
+        for i in range(len(channels)):  # pylint: disable=consider-using-enumerate
+            input_channel = output_channel
+            output_channel = channels[i]
+            is_last = i == len(channels) - 1
+            resnet = ResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim)
+            transformer_blocks = nn.ModuleList(
+                [
+                    self.get_block(
+                        down_block_type,
+                        output_channel,
+                        attention_head_dim,
+                        num_heads,
+                        dropout,
+                        act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+            downsample = (
+                Downsample1D(output_channel) if not is_last else nn.Conv1d(output_channel, output_channel, 3, padding=1)
+            )
+
+            self.down_blocks.append(nn.ModuleList([resnet, transformer_blocks, downsample]))
+
+        for i in range(num_mid_blocks):
+            input_channel = channels[-1]
+            out_channels = channels[-1]
+
+            resnet = ResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim)
+
+            transformer_blocks = nn.ModuleList(
+                [
+                    self.get_block(
+                        mid_block_type,
+                        output_channel,
+                        attention_head_dim,
+                        num_heads,
+                        dropout,
+                        act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+
+            self.mid_blocks.append(nn.ModuleList([resnet, transformer_blocks]))
+
+        channels = channels[::-1] + (channels[0],)
+        for i in range(len(channels) - 1):
+            input_channel = channels[i]
+            output_channel = channels[i + 1]
+            is_last = i == len(channels) - 2
+
+            resnet = ResnetBlock1D(
+                dim=2 * input_channel,
+                dim_out=output_channel,
+                time_emb_dim=time_embed_dim,
+            )
+            transformer_blocks = nn.ModuleList(
+                [
+                    self.get_block(
+                        up_block_type,
+                        output_channel,
+                        attention_head_dim,
+                        num_heads,
+                        dropout,
+                        act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+            upsample = (
+                Upsample1D(output_channel, use_conv_transpose=True)
+                if not is_last
+                else nn.Conv1d(output_channel, output_channel, 3, padding=1)
+            )
+
+            self.up_blocks.append(nn.ModuleList([resnet, transformer_blocks, upsample]))
+
+        self.final_block = Block1D(channels[-1], channels[-1])
+        self.final_proj = nn.Conv1d(channels[-1], self.out_channels, 1)
+
+        self.initialize_weights()
+        # nn.init.normal_(self.final_proj.weight)
+
+    @staticmethod
+    def get_block(block_type, dim, attention_head_dim, num_heads, dropout, act_fn):
+        if block_type == "conformer":
+            block = ConformerWrapper(
+                dim=dim,
+                dim_head=attention_head_dim,
+                heads=num_heads,
+                ff_mult=1,
+                conv_expansion_factor=2,
+                ff_dropout=dropout,
+                attn_dropout=dropout,
+                conv_dropout=dropout,
+                conv_kernel_size=31,
+            )
+        elif block_type == "transformer":
+            block = BasicTransformerBlock(
+                dim=dim,
+                num_attention_heads=num_heads,
+                attention_head_dim=attention_head_dim,
+                dropout=dropout,
+                activation_fn=act_fn,
+            )
+        else:
+            raise ValueError(f"Unknown block type {block_type}")
+
+        return block
+
+    def initialize_weights(self):
+        for m in self.modules():
+            if isinstance(m, nn.Conv1d):
+                nn.init.kaiming_normal_(m.weight, nonlinearity="relu")
+
+                if m.bias is not None:
+                    nn.init.constant_(m.bias, 0)
+
+            elif isinstance(m, nn.GroupNorm):
+                nn.init.constant_(m.weight, 1)
+                nn.init.constant_(m.bias, 0)
+
+            elif isinstance(m, nn.Linear):
+                nn.init.kaiming_normal_(m.weight, nonlinearity="relu")
+
+                if m.bias is not None:
+                    nn.init.constant_(m.bias, 0)
+
+    def forward(self, x, mask, mu, t, spks=None, cond=None):
+        """Forward pass of the UNet1DConditional model.
+
+        Args:
+            x (torch.Tensor): shape (batch_size, in_channels, time)
+            mask (_type_): shape (batch_size, 1, time)
+            t (_type_): shape (batch_size)
+            spks (_type_, optional): shape: (batch_size, condition_channels). Defaults to None.
+            cond (_type_, optional): placeholder for future use. Defaults to None.
+
+        Raises:
+            ValueError: _description_
+            ValueError: _description_
+
+        Returns:
+            _type_: _description_
+        """
+
+        t = self.time_embeddings(t)
+        t = self.time_mlp(t)
+
+        x = pack([x, mu], "b * t")[0]
+
+        if spks is not None:
+            spks = repeat(spks, "b c -> b c t", t=x.shape[-1])
+            x = pack([x, spks], "b * t")[0]
+
+        hiddens = []
+        masks = [mask]
+        for resnet, transformer_blocks, downsample in self.down_blocks:
+            mask_down = masks[-1]
+            x = resnet(x, mask_down, t)
+            x = rearrange(x, "b c t -> b t c")
+            mask_down = rearrange(mask_down, "b 1 t -> b t")
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=mask_down,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t")
+            mask_down = rearrange(mask_down, "b t -> b 1 t")
+            hiddens.append(x)  # Save hidden states for skip connections
+            x = downsample(x * mask_down)
+            masks.append(mask_down[:, :, ::2])
+
+        masks = masks[:-1]
+        mask_mid = masks[-1]
+
+        for resnet, transformer_blocks in self.mid_blocks:
+            x = resnet(x, mask_mid, t)
+            x = rearrange(x, "b c t -> b t c")
+            mask_mid = rearrange(mask_mid, "b 1 t -> b t")
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=mask_mid,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t")
+            mask_mid = rearrange(mask_mid, "b t -> b 1 t")
+
+        for resnet, transformer_blocks, upsample in self.up_blocks:
+            mask_up = masks.pop()
+            x = resnet(pack([x, hiddens.pop()], "b * t")[0], mask_up, t)
+            x = rearrange(x, "b c t -> b t c")
+            mask_up = rearrange(mask_up, "b 1 t -> b t")
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=mask_up,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t")
+            mask_up = rearrange(mask_up, "b t -> b 1 t")
+            x = upsample(x * mask_up)
+
+        x = self.final_block(x, mask_up)
+        output = self.final_proj(x * mask_up)
+
+        return output * mask

egs/ljspeech/TTS/matcha_tts/models/components/flow_matching.py

@@ -0,0 +1,132 @@
+from abc import ABC
+
+import torch
+import torch.nn.functional as F
+
+from matcha.models.components.decoder import Decoder
+from matcha.utils.pylogger import get_pylogger
+
+log = get_pylogger(__name__)
+
+
+class BASECFM(torch.nn.Module, ABC):
+    def __init__(
+        self,
+        n_feats,
+        cfm_params,
+        n_spks=1,
+        spk_emb_dim=128,
+    ):
+        super().__init__()
+        self.n_feats = n_feats
+        self.n_spks = n_spks
+        self.spk_emb_dim = spk_emb_dim
+        self.solver = cfm_params.solver
+        if hasattr(cfm_params, "sigma_min"):
+            self.sigma_min = cfm_params.sigma_min
+        else:
+            self.sigma_min = 1e-4
+
+        self.estimator = None
+
+    @torch.inference_mode()
+    def forward(self, mu, mask, n_timesteps, temperature=1.0, spks=None, cond=None):
+        """Forward diffusion
+
+        Args:
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): output_mask
+                shape: (batch_size, 1, mel_timesteps)
+            n_timesteps (int): number of diffusion steps
+            temperature (float, optional): temperature for scaling noise. Defaults to 1.0.
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+            cond: Not used but kept for future purposes
+
+        Returns:
+            sample: generated mel-spectrogram
+                shape: (batch_size, n_feats, mel_timesteps)
+        """
+        z = torch.randn_like(mu) * temperature
+        t_span = torch.linspace(0, 1, n_timesteps + 1, device=mu.device)
+        return self.solve_euler(z, t_span=t_span, mu=mu, mask=mask, spks=spks, cond=cond)
+
+    def solve_euler(self, x, t_span, mu, mask, spks, cond):
+        """
+        Fixed euler solver for ODEs.
+        Args:
+            x (torch.Tensor): random noise
+            t_span (torch.Tensor): n_timesteps interpolated
+                shape: (n_timesteps + 1,)
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): output_mask
+                shape: (batch_size, 1, mel_timesteps)
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+            cond: Not used but kept for future purposes
+        """
+        t, _, dt = t_span[0], t_span[-1], t_span[1] - t_span[0]
+
+        # I am storing this because I can later plot it by putting a debugger here and saving it to a file
+        # Or in future might add like a return_all_steps flag
+        sol = []
+
+        for step in range(1, len(t_span)):
+            dphi_dt = self.estimator(x, mask, mu, t, spks, cond)
+
+            x = x + dt * dphi_dt
+            t = t + dt
+            sol.append(x)
+            if step < len(t_span) - 1:
+                dt = t_span[step + 1] - t
+
+        return sol[-1]
+
+    def compute_loss(self, x1, mask, mu, spks=None, cond=None):
+        """Computes diffusion loss
+
+        Args:
+            x1 (torch.Tensor): Target
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): target mask
+                shape: (batch_size, 1, mel_timesteps)
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            spks (torch.Tensor, optional): speaker embedding. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+
+        Returns:
+            loss: conditional flow matching loss
+            y: conditional flow
+                shape: (batch_size, n_feats, mel_timesteps)
+        """
+        b, _, t = mu.shape
+
+        # random timestep
+        t = torch.rand([b, 1, 1], device=mu.device, dtype=mu.dtype)
+        # sample noise p(x_0)
+        z = torch.randn_like(x1)
+
+        y = (1 - (1 - self.sigma_min) * t) * z + t * x1
+        u = x1 - (1 - self.sigma_min) * z
+
+        loss = F.mse_loss(self.estimator(y, mask, mu, t.squeeze(), spks), u, reduction="sum") / (
+            torch.sum(mask) * u.shape[1]
+        )
+        return loss, y
+
+
+class CFM(BASECFM):
+    def __init__(self, in_channels, out_channel, cfm_params, decoder_params, n_spks=1, spk_emb_dim=64):
+        super().__init__(
+            n_feats=in_channels,
+            cfm_params=cfm_params,
+            n_spks=n_spks,
+            spk_emb_dim=spk_emb_dim,
+        )
+
+        in_channels = in_channels + (spk_emb_dim if n_spks > 1 else 0)
+        # Just change the architecture of the estimator here
+        self.estimator = Decoder(in_channels=in_channels, out_channels=out_channel, **decoder_params)

egs/ljspeech/TTS/matcha_tts/models/components/text_encoder.py

@@ -0,0 +1,410 @@
+""" from https://github.com/jaywalnut310/glow-tts """
+
+import math
+
+import torch
+import torch.nn as nn
+from einops import rearrange
+
+import matcha.utils as utils
+from matcha.utils.model import sequence_mask
+
+log = utils.get_pylogger(__name__)
+
+
+class LayerNorm(nn.Module):
+    def __init__(self, channels, eps=1e-4):
+        super().__init__()
+        self.channels = channels
+        self.eps = eps
+
+        self.gamma = torch.nn.Parameter(torch.ones(channels))
+        self.beta = torch.nn.Parameter(torch.zeros(channels))
+
+    def forward(self, x):
+        n_dims = len(x.shape)
+        mean = torch.mean(x, 1, keepdim=True)
+        variance = torch.mean((x - mean) ** 2, 1, keepdim=True)
+
+        x = (x - mean) * torch.rsqrt(variance + self.eps)
+
+        shape = [1, -1] + [1] * (n_dims - 2)
+        x = x * self.gamma.view(*shape) + self.beta.view(*shape)
+        return x
+
+
+class ConvReluNorm(nn.Module):
+    def __init__(self, in_channels, hidden_channels, out_channels, kernel_size, n_layers, p_dropout):
+        super().__init__()
+        self.in_channels = in_channels
+        self.hidden_channels = hidden_channels
+        self.out_channels = out_channels
+        self.kernel_size = kernel_size
+        self.n_layers = n_layers
+        self.p_dropout = p_dropout
+
+        self.conv_layers = torch.nn.ModuleList()
+        self.norm_layers = torch.nn.ModuleList()
+        self.conv_layers.append(torch.nn.Conv1d(in_channels, hidden_channels, kernel_size, padding=kernel_size // 2))
+        self.norm_layers.append(LayerNorm(hidden_channels))
+        self.relu_drop = torch.nn.Sequential(torch.nn.ReLU(), torch.nn.Dropout(p_dropout))
+        for _ in range(n_layers - 1):
+            self.conv_layers.append(
+                torch.nn.Conv1d(hidden_channels, hidden_channels, kernel_size, padding=kernel_size // 2)
+            )
+            self.norm_layers.append(LayerNorm(hidden_channels))
+        self.proj = torch.nn.Conv1d(hidden_channels, out_channels, 1)
+        self.proj.weight.data.zero_()
+        self.proj.bias.data.zero_()
+
+    def forward(self, x, x_mask):
+        x_org = x
+        for i in range(self.n_layers):
+            x = self.conv_layers[i](x * x_mask)
+            x = self.norm_layers[i](x)
+            x = self.relu_drop(x)
+        x = x_org + self.proj(x)
+        return x * x_mask
+
+
+class DurationPredictor(nn.Module):
+    def __init__(self, in_channels, filter_channels, kernel_size, p_dropout):
+        super().__init__()
+        self.in_channels = in_channels
+        self.filter_channels = filter_channels
+        self.p_dropout = p_dropout
+
+        self.drop = torch.nn.Dropout(p_dropout)
+        self.conv_1 = torch.nn.Conv1d(in_channels, filter_channels, kernel_size, padding=kernel_size // 2)
+        self.norm_1 = LayerNorm(filter_channels)
+        self.conv_2 = torch.nn.Conv1d(filter_channels, filter_channels, kernel_size, padding=kernel_size // 2)
+        self.norm_2 = LayerNorm(filter_channels)
+        self.proj = torch.nn.Conv1d(filter_channels, 1, 1)
+
+    def forward(self, x, x_mask):
+        x = self.conv_1(x * x_mask)
+        x = torch.relu(x)
+        x = self.norm_1(x)
+        x = self.drop(x)
+        x = self.conv_2(x * x_mask)
+        x = torch.relu(x)
+        x = self.norm_2(x)
+        x = self.drop(x)
+        x = self.proj(x * x_mask)
+        return x * x_mask
+
+
+class RotaryPositionalEmbeddings(nn.Module):
+    """
+    ## RoPE module
+
+    Rotary encoding transforms pairs of features by rotating in the 2D plane.
+    That is, it organizes the $d$ features as $\frac{d}{2}$ pairs.
+    Each pair can be considered a coordinate in a 2D plane, and the encoding will rotate it
+    by an angle depending on the position of the token.
+    """
+
+    def __init__(self, d: int, base: int = 10_000):
+        r"""
+        * `d` is the number of features $d$
+        * `base` is the constant used for calculating $\Theta$
+        """
+        super().__init__()
+
+        self.base = base
+        self.d = int(d)
+        self.cos_cached = None
+        self.sin_cached = None
+
+    def _build_cache(self, x: torch.Tensor):
+        r"""
+        Cache $\cos$ and $\sin$ values
+        """
+        # Return if cache is already built
+        if self.cos_cached is not None and x.shape[0] <= self.cos_cached.shape[0]:
+            return
+
+        # Get sequence length
+        seq_len = x.shape[0]
+
+        # $\Theta = {\theta_i = 10000^{-\frac{2(i-1)}{d}}, i \in [1, 2, ..., \frac{d}{2}]}$
+        theta = 1.0 / (self.base ** (torch.arange(0, self.d, 2).float() / self.d)).to(x.device)
+
+        # Create position indexes `[0, 1, ..., seq_len - 1]`
+        seq_idx = torch.arange(seq_len, device=x.device).float().to(x.device)
+
+        # Calculate the product of position index and $\theta_i$
+        idx_theta = torch.einsum("n,d->nd", seq_idx, theta)
+
+        # Concatenate so that for row $m$ we have
+        # $[m \theta_0, m \theta_1, ..., m \theta_{\frac{d}{2}}, m \theta_0, m \theta_1, ..., m \theta_{\frac{d}{2}}]$
+        idx_theta2 = torch.cat([idx_theta, idx_theta], dim=1)
+
+        # Cache them
+        self.cos_cached = idx_theta2.cos()[:, None, None, :]
+        self.sin_cached = idx_theta2.sin()[:, None, None, :]
+
+    def _neg_half(self, x: torch.Tensor):
+        # $\frac{d}{2}$
+        d_2 = self.d // 2
+
+        # Calculate $[-x^{(\frac{d}{2} + 1)}, -x^{(\frac{d}{2} + 2)}, ..., -x^{(d)}, x^{(1)}, x^{(2)}, ..., x^{(\frac{d}{2})}]$
+        return torch.cat([-x[:, :, :, d_2:], x[:, :, :, :d_2]], dim=-1)
+
+    def forward(self, x: torch.Tensor):
+        """
+        * `x` is the Tensor at the head of a key or a query with shape `[seq_len, batch_size, n_heads, d]`
+        """
+        # Cache $\cos$ and $\sin$ values
+        x = rearrange(x, "b h t d -> t b h d")
+
+        self._build_cache(x)
+
+        # Split the features, we can choose to apply rotary embeddings only to a partial set of features.
+        x_rope, x_pass = x[..., : self.d], x[..., self.d :]
+
+        # Calculate
+        # $[-x^{(\frac{d}{2} + 1)}, -x^{(\frac{d}{2} + 2)}, ..., -x^{(d)}, x^{(1)}, x^{(2)}, ..., x^{(\frac{d}{2})}]$
+        neg_half_x = self._neg_half(x_rope)
+
+        x_rope = (x_rope * self.cos_cached[: x.shape[0]]) + (neg_half_x * self.sin_cached[: x.shape[0]])
+
+        return rearrange(torch.cat((x_rope, x_pass), dim=-1), "t b h d -> b h t d")
+
+
+class MultiHeadAttention(nn.Module):
+    def __init__(
+        self,
+        channels,
+        out_channels,
+        n_heads,
+        heads_share=True,
+        p_dropout=0.0,
+        proximal_bias=False,
+        proximal_init=False,
+    ):
+        super().__init__()
+        assert channels % n_heads == 0
+
+        self.channels = channels
+        self.out_channels = out_channels
+        self.n_heads = n_heads
+        self.heads_share = heads_share
+        self.proximal_bias = proximal_bias
+        self.p_dropout = p_dropout
+        self.attn = None
+
+        self.k_channels = channels // n_heads
+        self.conv_q = torch.nn.Conv1d(channels, channels, 1)
+        self.conv_k = torch.nn.Conv1d(channels, channels, 1)
+        self.conv_v = torch.nn.Conv1d(channels, channels, 1)
+
+        # from https://nn.labml.ai/transformers/rope/index.html
+        self.query_rotary_pe = RotaryPositionalEmbeddings(self.k_channels * 0.5)
+        self.key_rotary_pe = RotaryPositionalEmbeddings(self.k_channels * 0.5)
+
+        self.conv_o = torch.nn.Conv1d(channels, out_channels, 1)
+        self.drop = torch.nn.Dropout(p_dropout)
+
+        torch.nn.init.xavier_uniform_(self.conv_q.weight)
+        torch.nn.init.xavier_uniform_(self.conv_k.weight)
+        if proximal_init:
+            self.conv_k.weight.data.copy_(self.conv_q.weight.data)
+            self.conv_k.bias.data.copy_(self.conv_q.bias.data)
+        torch.nn.init.xavier_uniform_(self.conv_v.weight)
+
+    def forward(self, x, c, attn_mask=None):
+        q = self.conv_q(x)
+        k = self.conv_k(c)
+        v = self.conv_v(c)
+
+        x, self.attn = self.attention(q, k, v, mask=attn_mask)
+
+        x = self.conv_o(x)
+        return x
+
+    def attention(self, query, key, value, mask=None):
+        b, d, t_s, t_t = (*key.size(), query.size(2))
+        query = rearrange(query, "b (h c) t-> b h t c", h=self.n_heads)
+        key = rearrange(key, "b (h c) t-> b h t c", h=self.n_heads)
+        value = rearrange(value, "b (h c) t-> b h t c", h=self.n_heads)
+
+        query = self.query_rotary_pe(query)
+        key = self.key_rotary_pe(key)
+
+        scores = torch.matmul(query, key.transpose(-2, -1)) / math.sqrt(self.k_channels)
+
+        if self.proximal_bias:
+            assert t_s == t_t, "Proximal bias is only available for self-attention."
+            scores = scores + self._attention_bias_proximal(t_s).to(device=scores.device, dtype=scores.dtype)
+        if mask is not None:
+            scores = scores.masked_fill(mask == 0, -1e4)
+        p_attn = torch.nn.functional.softmax(scores, dim=-1)
+        p_attn = self.drop(p_attn)
+        output = torch.matmul(p_attn, value)
+        output = output.transpose(2, 3).contiguous().view(b, d, t_t)
+        return output, p_attn
+
+    @staticmethod
+    def _attention_bias_proximal(length):
+        r = torch.arange(length, dtype=torch.float32)
+        diff = torch.unsqueeze(r, 0) - torch.unsqueeze(r, 1)
+        return torch.unsqueeze(torch.unsqueeze(-torch.log1p(torch.abs(diff)), 0), 0)
+
+
+class FFN(nn.Module):
+    def __init__(self, in_channels, out_channels, filter_channels, kernel_size, p_dropout=0.0):
+        super().__init__()
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        self.filter_channels = filter_channels
+        self.kernel_size = kernel_size
+        self.p_dropout = p_dropout
+
+        self.conv_1 = torch.nn.Conv1d(in_channels, filter_channels, kernel_size, padding=kernel_size // 2)
+        self.conv_2 = torch.nn.Conv1d(filter_channels, out_channels, kernel_size, padding=kernel_size // 2)
+        self.drop = torch.nn.Dropout(p_dropout)
+
+    def forward(self, x, x_mask):
+        x = self.conv_1(x * x_mask)
+        x = torch.relu(x)
+        x = self.drop(x)
+        x = self.conv_2(x * x_mask)
+        return x * x_mask
+
+
+class Encoder(nn.Module):
+    def __init__(
+        self,
+        hidden_channels,
+        filter_channels,
+        n_heads,
+        n_layers,
+        kernel_size=1,
+        p_dropout=0.0,
+        **kwargs,
+    ):
+        super().__init__()
+        self.hidden_channels = hidden_channels
+        self.filter_channels = filter_channels
+        self.n_heads = n_heads
+        self.n_layers = n_layers
+        self.kernel_size = kernel_size
+        self.p_dropout = p_dropout
+
+        self.drop = torch.nn.Dropout(p_dropout)
+        self.attn_layers = torch.nn.ModuleList()
+        self.norm_layers_1 = torch.nn.ModuleList()
+        self.ffn_layers = torch.nn.ModuleList()
+        self.norm_layers_2 = torch.nn.ModuleList()
+        for _ in range(self.n_layers):
+            self.attn_layers.append(MultiHeadAttention(hidden_channels, hidden_channels, n_heads, p_dropout=p_dropout))
+            self.norm_layers_1.append(LayerNorm(hidden_channels))
+            self.ffn_layers.append(
+                FFN(
+                    hidden_channels,
+                    hidden_channels,
+                    filter_channels,
+                    kernel_size,
+                    p_dropout=p_dropout,
+                )
+            )
+            self.norm_layers_2.append(LayerNorm(hidden_channels))
+
+    def forward(self, x, x_mask):
+        attn_mask = x_mask.unsqueeze(2) * x_mask.unsqueeze(-1)
+        for i in range(self.n_layers):
+            x = x * x_mask
+            y = self.attn_layers[i](x, x, attn_mask)
+            y = self.drop(y)
+            x = self.norm_layers_1[i](x + y)
+            y = self.ffn_layers[i](x, x_mask)
+            y = self.drop(y)
+            x = self.norm_layers_2[i](x + y)
+        x = x * x_mask
+        return x
+
+
+class TextEncoder(nn.Module):
+    def __init__(
+        self,
+        encoder_type,
+        encoder_params,
+        duration_predictor_params,
+        n_vocab,
+        n_spks=1,
+        spk_emb_dim=128,
+    ):
+        super().__init__()
+        self.encoder_type = encoder_type
+        self.n_vocab = n_vocab
+        self.n_feats = encoder_params.n_feats
+        self.n_channels = encoder_params.n_channels
+        self.spk_emb_dim = spk_emb_dim
+        self.n_spks = n_spks
+
+        self.emb = torch.nn.Embedding(n_vocab, self.n_channels)
+        torch.nn.init.normal_(self.emb.weight, 0.0, self.n_channels**-0.5)
+
+        if encoder_params.prenet:
+            self.prenet = ConvReluNorm(
+                self.n_channels,
+                self.n_channels,
+                self.n_channels,
+                kernel_size=5,
+                n_layers=3,
+                p_dropout=0.5,
+            )
+        else:
+            self.prenet = lambda x, x_mask: x
+
+        self.encoder = Encoder(
+            encoder_params.n_channels + (spk_emb_dim if n_spks > 1 else 0),
+            encoder_params.filter_channels,
+            encoder_params.n_heads,
+            encoder_params.n_layers,
+            encoder_params.kernel_size,
+            encoder_params.p_dropout,
+        )
+
+        self.proj_m = torch.nn.Conv1d(self.n_channels + (spk_emb_dim if n_spks > 1 else 0), self.n_feats, 1)
+        self.proj_w = DurationPredictor(
+            self.n_channels + (spk_emb_dim if n_spks > 1 else 0),
+            duration_predictor_params.filter_channels_dp,
+            duration_predictor_params.kernel_size,
+            duration_predictor_params.p_dropout,
+        )
+
+    def forward(self, x, x_lengths, spks=None):
+        """Run forward pass to the transformer based encoder and duration predictor
+
+        Args:
+            x (torch.Tensor): text input
+                shape: (batch_size, max_text_length)
+            x_lengths (torch.Tensor): text input lengths
+                shape: (batch_size,)
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size,)
+
+        Returns:
+            mu (torch.Tensor): average output of the encoder
+                shape: (batch_size, n_feats, max_text_length)
+            logw (torch.Tensor): log duration predicted by the duration predictor
+                shape: (batch_size, 1, max_text_length)
+            x_mask (torch.Tensor): mask for the text input
+                shape: (batch_size, 1, max_text_length)
+        """
+        x = self.emb(x) * math.sqrt(self.n_channels)
+        x = torch.transpose(x, 1, -1)
+        x_mask = torch.unsqueeze(sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)
+
+        x = self.prenet(x, x_mask)
+        if self.n_spks > 1:
+            x = torch.cat([x, spks.unsqueeze(-1).repeat(1, 1, x.shape[-1])], dim=1)
+        x = self.encoder(x, x_mask)
+        mu = self.proj_m(x) * x_mask
+
+        x_dp = torch.detach(x)
+        logw = self.proj_w(x_dp, x_mask)
+
+        return mu, logw, x_mask

egs/ljspeech/TTS/matcha_tts/models/components/transformer.py

@@ -0,0 +1,316 @@
+from typing import Any, Dict, Optional
+
+import torch
+import torch.nn as nn
+from diffusers.models.attention import (
+    GEGLU,
+    GELU,
+    AdaLayerNorm,
+    AdaLayerNormZero,
+    ApproximateGELU,
+)
+from diffusers.models.attention_processor import Attention
+from diffusers.models.lora import LoRACompatibleLinear
+from diffusers.utils.torch_utils import maybe_allow_in_graph
+
+
+class SnakeBeta(nn.Module):
+    """
+    A modified Snake function which uses separate parameters for the magnitude of the periodic components
+    Shape:
+        - Input: (B, C, T)
+        - Output: (B, C, T), same shape as the input
+    Parameters:
+        - alpha - trainable parameter that controls frequency
+        - beta - trainable parameter that controls magnitude
+    References:
+        - This activation function is a modified version based on this paper by Liu Ziyin, Tilman Hartwig, Masahito Ueda:
+        https://arxiv.org/abs/2006.08195
+    Examples:
+        >>> a1 = snakebeta(256)
+        >>> x = torch.randn(256)
+        >>> x = a1(x)
+    """
+
+    def __init__(self, in_features, out_features, alpha=1.0, alpha_trainable=True, alpha_logscale=True):
+        """
+        Initialization.
+        INPUT:
+            - in_features: shape of the input
+            - alpha - trainable parameter that controls frequency
+            - beta - trainable parameter that controls magnitude
+            alpha is initialized to 1 by default, higher values = higher-frequency.
+            beta is initialized to 1 by default, higher values = higher-magnitude.
+            alpha will be trained along with the rest of your model.
+        """
+        super().__init__()
+        self.in_features = out_features if isinstance(out_features, list) else [out_features]
+        self.proj = LoRACompatibleLinear(in_features, out_features)
+
+        # initialize alpha
+        self.alpha_logscale = alpha_logscale
+        if self.alpha_logscale:  # log scale alphas initialized to zeros
+            self.alpha = nn.Parameter(torch.zeros(self.in_features) * alpha)
+            self.beta = nn.Parameter(torch.zeros(self.in_features) * alpha)
+        else:  # linear scale alphas initialized to ones
+            self.alpha = nn.Parameter(torch.ones(self.in_features) * alpha)
+            self.beta = nn.Parameter(torch.ones(self.in_features) * alpha)
+
+        self.alpha.requires_grad = alpha_trainable
+        self.beta.requires_grad = alpha_trainable
+
+        self.no_div_by_zero = 0.000000001
+
+    def forward(self, x):
+        """
+        Forward pass of the function.
+        Applies the function to the input elementwise.
+        SnakeBeta ∶= x + 1/b * sin^2 (xa)
+        """
+        x = self.proj(x)
+        if self.alpha_logscale:
+            alpha = torch.exp(self.alpha)
+            beta = torch.exp(self.beta)
+        else:
+            alpha = self.alpha
+            beta = self.beta
+
+        x = x + (1.0 / (beta + self.no_div_by_zero)) * torch.pow(torch.sin(x * alpha), 2)
+
+        return x
+
+
+class FeedForward(nn.Module):
+    r"""
+    A feed-forward layer.
+
+    Parameters:
+        dim (`int`): The number of channels in the input.
+        dim_out (`int`, *optional*): The number of channels in the output. If not given, defaults to `dim`.
+        mult (`int`, *optional*, defaults to 4): The multiplier to use for the hidden dimension.
+        dropout (`float`, *optional*, defaults to 0.0): The dropout probability to use.
+        activation_fn (`str`, *optional*, defaults to `"geglu"`): Activation function to be used in feed-forward.
+        final_dropout (`bool` *optional*, defaults to False): Apply a final dropout.
+    """
+
+    def __init__(
+        self,
+        dim: int,
+        dim_out: Optional[int] = None,
+        mult: int = 4,
+        dropout: float = 0.0,
+        activation_fn: str = "geglu",
+        final_dropout: bool = False,
+    ):
+        super().__init__()
+        inner_dim = int(dim * mult)
+        dim_out = dim_out if dim_out is not None else dim
+
+        if activation_fn == "gelu":
+            act_fn = GELU(dim, inner_dim)
+        if activation_fn == "gelu-approximate":
+            act_fn = GELU(dim, inner_dim, approximate="tanh")
+        elif activation_fn == "geglu":
+            act_fn = GEGLU(dim, inner_dim)
+        elif activation_fn == "geglu-approximate":
+            act_fn = ApproximateGELU(dim, inner_dim)
+        elif activation_fn == "snakebeta":
+            act_fn = SnakeBeta(dim, inner_dim)
+
+        self.net = nn.ModuleList([])
+        # project in
+        self.net.append(act_fn)
+        # project dropout
+        self.net.append(nn.Dropout(dropout))
+        # project out
+        self.net.append(LoRACompatibleLinear(inner_dim, dim_out))
+        # FF as used in Vision Transformer, MLP-Mixer, etc. have a final dropout
+        if final_dropout:
+            self.net.append(nn.Dropout(dropout))
+
+    def forward(self, hidden_states):
+        for module in self.net:
+            hidden_states = module(hidden_states)
+        return hidden_states
+
+
+@maybe_allow_in_graph
+class BasicTransformerBlock(nn.Module):
+    r"""
+    A basic Transformer block.
+
+    Parameters:
+        dim (`int`): The number of channels in the input and output.
+        num_attention_heads (`int`): The number of heads to use for multi-head attention.
+        attention_head_dim (`int`): The number of channels in each head.
+        dropout (`float`, *optional*, defaults to 0.0): The dropout probability to use.
+        cross_attention_dim (`int`, *optional*): The size of the encoder_hidden_states vector for cross attention.
+        only_cross_attention (`bool`, *optional*):
+            Whether to use only cross-attention layers. In this case two cross attention layers are used.
+        double_self_attention (`bool`, *optional*):
+            Whether to use two self-attention layers. In this case no cross attention layers are used.
+        activation_fn (`str`, *optional*, defaults to `"geglu"`): Activation function to be used in feed-forward.
+        num_embeds_ada_norm (:
+            obj: `int`, *optional*): The number of diffusion steps used during training. See `Transformer2DModel`.
+        attention_bias (:
+            obj: `bool`, *optional*, defaults to `False`): Configure if the attentions should contain a bias parameter.
+    """
+
+    def __init__(
+        self,
+        dim: int,
+        num_attention_heads: int,
+        attention_head_dim: int,
+        dropout=0.0,
+        cross_attention_dim: Optional[int] = None,
+        activation_fn: str = "geglu",
+        num_embeds_ada_norm: Optional[int] = None,
+        attention_bias: bool = False,
+        only_cross_attention: bool = False,
+        double_self_attention: bool = False,
+        upcast_attention: bool = False,
+        norm_elementwise_affine: bool = True,
+        norm_type: str = "layer_norm",
+        final_dropout: bool = False,
+    ):
+        super().__init__()
+        self.only_cross_attention = only_cross_attention
+
+        self.use_ada_layer_norm_zero = (num_embeds_ada_norm is not None) and norm_type == "ada_norm_zero"
+        self.use_ada_layer_norm = (num_embeds_ada_norm is not None) and norm_type == "ada_norm"
+
+        if norm_type in ("ada_norm", "ada_norm_zero") and num_embeds_ada_norm is None:
+            raise ValueError(
+                f"`norm_type` is set to {norm_type}, but `num_embeds_ada_norm` is not defined. Please make sure to"
+                f" define `num_embeds_ada_norm` if setting `norm_type` to {norm_type}."
+            )
+
+        # Define 3 blocks. Each block has its own normalization layer.
+        # 1. Self-Attn
+        if self.use_ada_layer_norm:
+            self.norm1 = AdaLayerNorm(dim, num_embeds_ada_norm)
+        elif self.use_ada_layer_norm_zero:
+            self.norm1 = AdaLayerNormZero(dim, num_embeds_ada_norm)
+        else:
+            self.norm1 = nn.LayerNorm(dim, elementwise_affine=norm_elementwise_affine)
+        self.attn1 = Attention(
+            query_dim=dim,
+            heads=num_attention_heads,
+            dim_head=attention_head_dim,
+            dropout=dropout,
+            bias=attention_bias,
+            cross_attention_dim=cross_attention_dim if only_cross_attention else None,
+            upcast_attention=upcast_attention,
+        )
+
+        # 2. Cross-Attn
+        if cross_attention_dim is not None or double_self_attention:
+            # We currently only use AdaLayerNormZero for self attention where there will only be one attention block.
+            # I.e. the number of returned modulation chunks from AdaLayerZero would not make sense if returned during
+            # the second cross attention block.
+            self.norm2 = (
+                AdaLayerNorm(dim, num_embeds_ada_norm)
+                if self.use_ada_layer_norm
+                else nn.LayerNorm(dim, elementwise_affine=norm_elementwise_affine)
+            )
+            self.attn2 = Attention(
+                query_dim=dim,
+                cross_attention_dim=cross_attention_dim if not double_self_attention else None,
+                heads=num_attention_heads,
+                dim_head=attention_head_dim,
+                dropout=dropout,
+                bias=attention_bias,
+                upcast_attention=upcast_attention,
+                # scale_qk=False, # uncomment this to not to use flash attention
+            )  # is self-attn if encoder_hidden_states is none
+        else:
+            self.norm2 = None
+            self.attn2 = None
+
+        # 3. Feed-forward
+        self.norm3 = nn.LayerNorm(dim, elementwise_affine=norm_elementwise_affine)
+        self.ff = FeedForward(dim, dropout=dropout, activation_fn=activation_fn, final_dropout=final_dropout)
+
+        # let chunk size default to None
+        self._chunk_size = None
+        self._chunk_dim = 0
+
+    def set_chunk_feed_forward(self, chunk_size: Optional[int], dim: int):
+        # Sets chunk feed-forward
+        self._chunk_size = chunk_size
+        self._chunk_dim = dim
+
+    def forward(
+        self,
+        hidden_states: torch.FloatTensor,
+        attention_mask: Optional[torch.FloatTensor] = None,
+        encoder_hidden_states: Optional[torch.FloatTensor] = None,
+        encoder_attention_mask: Optional[torch.FloatTensor] = None,
+        timestep: Optional[torch.LongTensor] = None,
+        cross_attention_kwargs: Dict[str, Any] = None,
+        class_labels: Optional[torch.LongTensor] = None,
+    ):
+        # Notice that normalization is always applied before the real computation in the following blocks.
+        # 1. Self-Attention
+        if self.use_ada_layer_norm:
+            norm_hidden_states = self.norm1(hidden_states, timestep)
+        elif self.use_ada_layer_norm_zero:
+            norm_hidden_states, gate_msa, shift_mlp, scale_mlp, gate_mlp = self.norm1(
+                hidden_states, timestep, class_labels, hidden_dtype=hidden_states.dtype
+            )
+        else:
+            norm_hidden_states = self.norm1(hidden_states)
+
+        cross_attention_kwargs = cross_attention_kwargs if cross_attention_kwargs is not None else {}
+
+        attn_output = self.attn1(
+            norm_hidden_states,
+            encoder_hidden_states=encoder_hidden_states if self.only_cross_attention else None,
+            attention_mask=encoder_attention_mask if self.only_cross_attention else attention_mask,
+            **cross_attention_kwargs,
+        )
+        if self.use_ada_layer_norm_zero:
+            attn_output = gate_msa.unsqueeze(1) * attn_output
+        hidden_states = attn_output + hidden_states
+
+        # 2. Cross-Attention
+        if self.attn2 is not None:
+            norm_hidden_states = (
+                self.norm2(hidden_states, timestep) if self.use_ada_layer_norm else self.norm2(hidden_states)
+            )
+
+            attn_output = self.attn2(
+                norm_hidden_states,
+                encoder_hidden_states=encoder_hidden_states,
+                attention_mask=encoder_attention_mask,
+                **cross_attention_kwargs,
+            )
+            hidden_states = attn_output + hidden_states
+
+        # 3. Feed-forward
+        norm_hidden_states = self.norm3(hidden_states)
+
+        if self.use_ada_layer_norm_zero:
+            norm_hidden_states = norm_hidden_states * (1 + scale_mlp[:, None]) + shift_mlp[:, None]
+
+        if self._chunk_size is not None:
+            # "feed_forward_chunk_size" can be used to save memory
+            if norm_hidden_states.shape[self._chunk_dim] % self._chunk_size != 0:
+                raise ValueError(
+                    f"`hidden_states` dimension to be chunked: {norm_hidden_states.shape[self._chunk_dim]} has to be divisible by chunk size: {self._chunk_size}. Make sure to set an appropriate `chunk_size` when calling `unet.enable_forward_chunking`."
+                )
+
+            num_chunks = norm_hidden_states.shape[self._chunk_dim] // self._chunk_size
+            ff_output = torch.cat(
+                [self.ff(hid_slice) for hid_slice in norm_hidden_states.chunk(num_chunks, dim=self._chunk_dim)],
+                dim=self._chunk_dim,
+            )
+        else:
+            ff_output = self.ff(norm_hidden_states)
+
+        if self.use_ada_layer_norm_zero:
+            ff_output = gate_mlp.unsqueeze(1) * ff_output
+
+        hidden_states = ff_output + hidden_states
+
+        return hidden_states

egs/ljspeech/TTS/matcha_tts/models/matcha_tts.py

@@ -0,0 +1,244 @@
+import datetime as dt
+import math
+import random
+
+import torch
+
+import matcha.utils.monotonic_align as monotonic_align
+from matcha import utils
+from matcha.models.baselightningmodule import BaseLightningClass
+from matcha.models.components.flow_matching import CFM
+from matcha.models.components.text_encoder import TextEncoder
+from matcha.utils.model import (
+    denormalize,
+    duration_loss,
+    fix_len_compatibility,
+    generate_path,
+    sequence_mask,
+)
+
+log = utils.get_pylogger(__name__)
+
+
+class MatchaTTS(BaseLightningClass):  # 🍵
+    def __init__(
+        self,
+        n_vocab,
+        n_spks,
+        spk_emb_dim,
+        n_feats,
+        encoder,
+        decoder,
+        cfm,
+        data_statistics,
+        out_size,
+        optimizer=None,
+        scheduler=None,
+        prior_loss=True,
+        use_precomputed_durations=False,
+    ):
+        super().__init__()
+
+        self.save_hyperparameters(logger=False)
+
+        self.n_vocab = n_vocab
+        self.n_spks = n_spks
+        self.spk_emb_dim = spk_emb_dim
+        self.n_feats = n_feats
+        self.out_size = out_size
+        self.prior_loss = prior_loss
+        self.use_precomputed_durations = use_precomputed_durations
+
+        if n_spks > 1:
+            self.spk_emb = torch.nn.Embedding(n_spks, spk_emb_dim)
+
+        self.encoder = TextEncoder(
+            encoder.encoder_type,
+            encoder.encoder_params,
+            encoder.duration_predictor_params,
+            n_vocab,
+            n_spks,
+            spk_emb_dim,
+        )
+
+        self.decoder = CFM(
+            in_channels=2 * encoder.encoder_params.n_feats,
+            out_channel=encoder.encoder_params.n_feats,
+            cfm_params=cfm,
+            decoder_params=decoder,
+            n_spks=n_spks,
+            spk_emb_dim=spk_emb_dim,
+        )
+
+        self.update_data_statistics(data_statistics)
+
+    @torch.inference_mode()
+    def synthesise(self, x, x_lengths, n_timesteps, temperature=1.0, spks=None, length_scale=1.0):
+        """
+        Generates mel-spectrogram from text. Returns:
+            1. encoder outputs
+            2. decoder outputs
+            3. generated alignment
+
+        Args:
+            x (torch.Tensor): batch of texts, converted to a tensor with phoneme embedding ids.
+                shape: (batch_size, max_text_length)
+            x_lengths (torch.Tensor): lengths of texts in batch.
+                shape: (batch_size,)
+            n_timesteps (int): number of steps to use for reverse diffusion in decoder.
+            temperature (float, optional): controls variance of terminal distribution.
+            spks (bool, optional): speaker ids.
+                shape: (batch_size,)
+            length_scale (float, optional): controls speech pace.
+                Increase value to slow down generated speech and vice versa.
+
+        Returns:
+            dict: {
+                "encoder_outputs": torch.Tensor, shape: (batch_size, n_feats, max_mel_length),
+                # Average mel spectrogram generated by the encoder
+                "decoder_outputs": torch.Tensor, shape: (batch_size, n_feats, max_mel_length),
+                # Refined mel spectrogram improved by the CFM
+                "attn": torch.Tensor, shape: (batch_size, max_text_length, max_mel_length),
+                # Alignment map between text and mel spectrogram
+                "mel": torch.Tensor, shape: (batch_size, n_feats, max_mel_length),
+                # Denormalized mel spectrogram
+                "mel_lengths": torch.Tensor, shape: (batch_size,),
+                # Lengths of mel spectrograms
+                "rtf": float,
+                # Real-time factor
+        """
+        # For RTF computation
+        t = dt.datetime.now()
+
+        if self.n_spks > 1:
+            # Get speaker embedding
+            spks = self.spk_emb(spks.long())
+
+        # Get encoder_outputs `mu_x` and log-scaled token durations `logw`
+        mu_x, logw, x_mask = self.encoder(x, x_lengths, spks)
+
+        w = torch.exp(logw) * x_mask
+        w_ceil = torch.ceil(w) * length_scale
+        y_lengths = torch.clamp_min(torch.sum(w_ceil, [1, 2]), 1).long()
+        y_max_length = y_lengths.max()
+        y_max_length_ = fix_len_compatibility(y_max_length)
+
+        # Using obtained durations `w` construct alignment map `attn`
+        y_mask = sequence_mask(y_lengths, y_max_length_).unsqueeze(1).to(x_mask.dtype)
+        attn_mask = x_mask.unsqueeze(-1) * y_mask.unsqueeze(2)
+        attn = generate_path(w_ceil.squeeze(1), attn_mask.squeeze(1)).unsqueeze(1)
+
+        # Align encoded text and get mu_y
+        mu_y = torch.matmul(attn.squeeze(1).transpose(1, 2), mu_x.transpose(1, 2))
+        mu_y = mu_y.transpose(1, 2)
+        encoder_outputs = mu_y[:, :, :y_max_length]
+
+        # Generate sample tracing the probability flow
+        decoder_outputs = self.decoder(mu_y, y_mask, n_timesteps, temperature, spks)
+        decoder_outputs = decoder_outputs[:, :, :y_max_length]
+
+        t = (dt.datetime.now() - t).total_seconds()
+        rtf = t * 22050 / (decoder_outputs.shape[-1] * 256)
+
+        return {
+            "encoder_outputs": encoder_outputs,
+            "decoder_outputs": decoder_outputs,
+            "attn": attn[:, :, :y_max_length],
+            "mel": denormalize(decoder_outputs, self.mel_mean, self.mel_std),
+            "mel_lengths": y_lengths,
+            "rtf": rtf,
+        }
+
+    def forward(self, x, x_lengths, y, y_lengths, spks=None, out_size=None, cond=None, durations=None):
+        """
+        Computes 3 losses:
+            1. duration loss: loss between predicted token durations and those extracted by Monotinic Alignment Search (MAS).
+            2. prior loss: loss between mel-spectrogram and encoder outputs.
+            3. flow matching loss: loss between mel-spectrogram and decoder outputs.
+
+        Args:
+            x (torch.Tensor): batch of texts, converted to a tensor with phoneme embedding ids.
+                shape: (batch_size, max_text_length)
+            x_lengths (torch.Tensor): lengths of texts in batch.
+                shape: (batch_size,)
+            y (torch.Tensor): batch of corresponding mel-spectrograms.
+                shape: (batch_size, n_feats, max_mel_length)
+            y_lengths (torch.Tensor): lengths of mel-spectrograms in batch.
+                shape: (batch_size,)
+            out_size (int, optional): length (in mel's sampling rate) of segment to cut, on which decoder will be trained.
+                Should be divisible by 2^{num of UNet downsamplings}. Needed to increase batch size.
+            spks (torch.Tensor, optional): speaker ids.
+                shape: (batch_size,)
+        """
+        if self.n_spks > 1:
+            # Get speaker embedding
+            spks = self.spk_emb(spks)
+
+        # Get encoder_outputs `mu_x` and log-scaled token durations `logw`
+        mu_x, logw, x_mask = self.encoder(x, x_lengths, spks)
+        y_max_length = y.shape[-1]
+
+        y_mask = sequence_mask(y_lengths, y_max_length).unsqueeze(1).to(x_mask)
+        attn_mask = x_mask.unsqueeze(-1) * y_mask.unsqueeze(2)
+
+        if self.use_precomputed_durations:
+            attn = generate_path(durations.squeeze(1), attn_mask.squeeze(1))
+        else:
+            # Use MAS to find most likely alignment `attn` between text and mel-spectrogram
+            with torch.no_grad():
+                const = -0.5 * math.log(2 * math.pi) * self.n_feats
+                factor = -0.5 * torch.ones(mu_x.shape, dtype=mu_x.dtype, device=mu_x.device)
+                y_square = torch.matmul(factor.transpose(1, 2), y**2)
+                y_mu_double = torch.matmul(2.0 * (factor * mu_x).transpose(1, 2), y)
+                mu_square = torch.sum(factor * (mu_x**2), 1).unsqueeze(-1)
+                log_prior = y_square - y_mu_double + mu_square + const
+
+                attn = monotonic_align.maximum_path(log_prior, attn_mask.squeeze(1))
+                attn = attn.detach()  # b, t_text, T_mel
+
+        # Compute loss between predicted log-scaled durations and those obtained from MAS
+        # refered to as prior loss in the paper
+        logw_ = torch.log(1e-8 + torch.sum(attn.unsqueeze(1), -1)) * x_mask
+        dur_loss = duration_loss(logw, logw_, x_lengths)
+
+        # Cut a small segment of mel-spectrogram in order to increase batch size
+        #   - "Hack" taken from Grad-TTS, in case of Grad-TTS, we cannot train batch size 32 on a 24GB GPU without it
+        #   - Do not need this hack for Matcha-TTS, but it works with it as well
+        if not isinstance(out_size, type(None)):
+            max_offset = (y_lengths - out_size).clamp(0)
+            offset_ranges = list(zip([0] * max_offset.shape[0], max_offset.cpu().numpy()))
+            out_offset = torch.LongTensor(
+                [torch.tensor(random.choice(range(start, end)) if end > start else 0) for start, end in offset_ranges]
+            ).to(y_lengths)
+            attn_cut = torch.zeros(attn.shape[0], attn.shape[1], out_size, dtype=attn.dtype, device=attn.device)
+            y_cut = torch.zeros(y.shape[0], self.n_feats, out_size, dtype=y.dtype, device=y.device)
+
+            y_cut_lengths = []
+            for i, (y_, out_offset_) in enumerate(zip(y, out_offset)):
+                y_cut_length = out_size + (y_lengths[i] - out_size).clamp(None, 0)
+                y_cut_lengths.append(y_cut_length)
+                cut_lower, cut_upper = out_offset_, out_offset_ + y_cut_length
+                y_cut[i, :, :y_cut_length] = y_[:, cut_lower:cut_upper]
+                attn_cut[i, :, :y_cut_length] = attn[i, :, cut_lower:cut_upper]
+
+            y_cut_lengths = torch.LongTensor(y_cut_lengths)
+            y_cut_mask = sequence_mask(y_cut_lengths).unsqueeze(1).to(y_mask)
+
+            attn = attn_cut
+            y = y_cut
+            y_mask = y_cut_mask
+
+        # Align encoded text with mel-spectrogram and get mu_y segment
+        mu_y = torch.matmul(attn.squeeze(1).transpose(1, 2), mu_x.transpose(1, 2))
+        mu_y = mu_y.transpose(1, 2)
+
+        # Compute loss of the decoder
+        diff_loss, _ = self.decoder.compute_loss(x1=y, mask=y_mask, mu=mu_y, spks=spks, cond=cond)
+
+        if self.prior_loss:
+            prior_loss = torch.sum(0.5 * ((y - mu_y) ** 2 + math.log(2 * math.pi)) * y_mask)
+            prior_loss = prior_loss / (torch.sum(y_mask) * self.n_feats)
+        else:
+            prior_loss = 0
+
+        return dur_loss, prior_loss, diff_loss, attn

egs/ljspeech/TTS/matcha_tts/text/__init__.py

@@ -0,0 +1,60 @@
+""" from https://github.com/keithito/tacotron """
+from matcha.text import cleaners
+from matcha.text.symbols import symbols
+
+# Mappings from symbol to numeric ID and vice versa:
+_symbol_to_id = {s: i for i, s in enumerate(symbols)}
+_id_to_symbol = {i: s for i, s in enumerate(symbols)}  # pylint: disable=unnecessary-comprehension
+
+
+def text_to_sequence(text, cleaner_names):
+    """Converts a string of text to a sequence of IDs corresponding to the symbols in the text.
+    Args:
+      text: string to convert to a sequence
+      cleaner_names: names of the cleaner functions to run the text through
+    Returns:
+      List of integers corresponding to the symbols in the text
+    """
+    sequence = []
+
+    clean_text = _clean_text(text, cleaner_names)
+    for symbol in clean_text:
+        try:
+            if symbol in '_()[]# ̃':
+                continue
+            symbol_id = _symbol_to_id[symbol]
+        except Exception as ex:
+            print(text)
+            print(clean_text)
+            raise RuntimeError(f'text: {text}, clean_text: {clean_text}, ex: {ex}, symbol: {symbol}')
+        sequence += [symbol_id]
+    return sequence, clean_text
+
+
+def cleaned_text_to_sequence(cleaned_text):
+    """Converts a string of text to a sequence of IDs corresponding to the symbols in the text.
+    Args:
+      text: string to convert to a sequence
+    Returns:
+      List of integers corresponding to the symbols in the text
+    """
+    sequence = [_symbol_to_id[symbol] for symbol in cleaned_text]
+    return sequence
+
+
+def sequence_to_text(sequence):
+    """Converts a sequence of IDs back to a string"""
+    result = ""
+    for symbol_id in sequence:
+        s = _id_to_symbol[symbol_id]
+        result += s
+    return result
+
+
+def _clean_text(text, cleaner_names):
+    for name in cleaner_names:
+        cleaner = getattr(cleaners, name)
+        if not cleaner:
+            raise Exception("Unknown cleaner: %s" % name)
+        text = cleaner(text)
+    return text

egs/ljspeech/TTS/matcha_tts/text/cleaners.py

@@ -0,0 +1,129 @@
+""" from https://github.com/keithito/tacotron
+
+Cleaners are transformations that run over the input text at both training and eval time.
+
+Cleaners can be selected by passing a comma-delimited list of cleaner names as the "cleaners"
+hyperparameter. Some cleaners are English-specific. You'll typically want to use:
+  1. "english_cleaners" for English text
+  2. "transliteration_cleaners" for non-English text that can be transliterated to ASCII using
+     the Unidecode library (https://pypi.python.org/pypi/Unidecode)
+  3. "basic_cleaners" if you do not want to transliterate (in this case, you should also update
+     the symbols in symbols.py to match your data).
+"""
+
+import logging
+import re
+
+import phonemizer
+from unidecode import unidecode
+
+# To avoid excessive logging we set the log level of the phonemizer package to Critical
+critical_logger = logging.getLogger("phonemizer")
+critical_logger.setLevel(logging.CRITICAL)
+
+# Intializing the phonemizer globally significantly reduces the speed
+# now the phonemizer is not initialising at every call
+# Might be less flexible, but it is much-much faster
+global_phonemizer = phonemizer.backend.EspeakBackend(
+    language="en-us",
+    preserve_punctuation=True,
+    with_stress=True,
+    language_switch="remove-flags",
+    logger=critical_logger,
+)
+
+
+# Regular expression matching whitespace:
+_whitespace_re = re.compile(r"\s+")
+
+# List of (regular expression, replacement) pairs for abbreviations:
+_abbreviations = [
+    (re.compile("\\b%s\\." % x[0], re.IGNORECASE), x[1])
+    for x in [
+        ("mrs", "misess"),
+        ("mr", "mister"),
+        ("dr", "doctor"),
+        ("st", "saint"),
+        ("co", "company"),
+        ("jr", "junior"),
+        ("maj", "major"),
+        ("gen", "general"),
+        ("drs", "doctors"),
+        ("rev", "reverend"),
+        ("lt", "lieutenant"),
+        ("hon", "honorable"),
+        ("sgt", "sergeant"),
+        ("capt", "captain"),
+        ("esq", "esquire"),
+        ("ltd", "limited"),
+        ("col", "colonel"),
+        ("ft", "fort"),
+    ]
+]
+
+
+def expand_abbreviations(text):
+    for regex, replacement in _abbreviations:
+        text = re.sub(regex, replacement, text)
+    return text
+
+
+def lowercase(text):
+    return text.lower()
+
+
+def collapse_whitespace(text):
+    return re.sub(_whitespace_re, " ", text)
+
+def remove_parentheses(text):
+    text =  text.replace("(", "")
+    text =  text.replace(")", "")
+    text =  text.replace("[", "")
+    text =  text.replace("]", "")
+    return text
+
+
+def convert_to_ascii(text):
+    return unidecode(text)
+
+
+def basic_cleaners(text):
+    """Basic pipeline that lowercases and collapses whitespace without transliteration."""
+    text = lowercase(text)
+    text = collapse_whitespace(text)
+    return text
+
+
+def transliteration_cleaners(text):
+    """Pipeline for non-English text that transliterates to ASCII."""
+    text = convert_to_ascii(text)
+    text = lowercase(text)
+    text = collapse_whitespace(text)
+    return text
+
+
+def english_cleaners2(text):
+    """Pipeline for English text, including abbreviation expansion. + punctuation + stress"""
+    text = convert_to_ascii(text)
+    text = lowercase(text)
+    text = expand_abbreviations(text)
+    text = remove_parentheses(text)
+    phonemes = global_phonemizer.phonemize([text], strip=True, njobs=1)[0]
+    phonemes = collapse_whitespace(phonemes)
+    return phonemes
+
+
+# I am removing this due to incompatibility with several version of python
+# However, if you want to use it, you can uncomment it
+# and install piper-phonemize with the following command:
+# pip install piper-phonemize
+
+# import piper_phonemize
+# def english_cleaners_piper(text):
+#     """Pipeline for English text, including abbreviation expansion. + punctuation + stress"""
+#     text = convert_to_ascii(text)
+#     text = lowercase(text)
+#     text = expand_abbreviations(text)
+#     phonemes = "".join(piper_phonemize.phonemize_espeak(text=text, voice="en-US")[0])
+#     phonemes = collapse_whitespace(phonemes)
+#     return phonemes

egs/ljspeech/TTS/matcha_tts/text/numbers.py

@@ -0,0 +1,71 @@
+""" from https://github.com/keithito/tacotron """
+
+import re
+
+import inflect
+
+_inflect = inflect.engine()
+_comma_number_re = re.compile(r"([0-9][0-9\,]+[0-9])")
+_decimal_number_re = re.compile(r"([0-9]+\.[0-9]+)")
+_pounds_re = re.compile(r"£([0-9\,]*[0-9]+)")
+_dollars_re = re.compile(r"\$([0-9\.\,]*[0-9]+)")
+_ordinal_re = re.compile(r"[0-9]+(st|nd|rd|th)")
+_number_re = re.compile(r"[0-9]+")
+
+
+def _remove_commas(m):
+    return m.group(1).replace(",", "")
+
+
+def _expand_decimal_point(m):
+    return m.group(1).replace(".", " point ")
+
+
+def _expand_dollars(m):
+    match = m.group(1)
+    parts = match.split(".")
+    if len(parts) > 2:
+        return match + " dollars"
+    dollars = int(parts[0]) if parts[0] else 0
+    cents = int(parts[1]) if len(parts) > 1 and parts[1] else 0
+    if dollars and cents:
+        dollar_unit = "dollar" if dollars == 1 else "dollars"
+        cent_unit = "cent" if cents == 1 else "cents"
+        return f"{dollars} {dollar_unit}, {cents} {cent_unit}"
+    elif dollars:
+        dollar_unit = "dollar" if dollars == 1 else "dollars"
+        return f"{dollars} {dollar_unit}"
+    elif cents:
+        cent_unit = "cent" if cents == 1 else "cents"
+        return f"{cents} {cent_unit}"
+    else:
+        return "zero dollars"
+
+
+def _expand_ordinal(m):
+    return _inflect.number_to_words(m.group(0))
+
+
+def _expand_number(m):
+    num = int(m.group(0))
+    if num > 1000 and num < 3000:
+        if num == 2000:
+            return "two thousand"
+        elif num > 2000 and num < 2010:
+            return "two thousand " + _inflect.number_to_words(num % 100)
+        elif num % 100 == 0:
+            return _inflect.number_to_words(num // 100) + " hundred"
+        else:
+            return _inflect.number_to_words(num, andword="", zero="oh", group=2).replace(", ", " ")
+    else:
+        return _inflect.number_to_words(num, andword="")
+
+
+def normalize_numbers(text):
+    text = re.sub(_comma_number_re, _remove_commas, text)
+    text = re.sub(_pounds_re, r"\1 pounds", text)
+    text = re.sub(_dollars_re, _expand_dollars, text)
+    text = re.sub(_decimal_number_re, _expand_decimal_point, text)
+    text = re.sub(_ordinal_re, _expand_ordinal, text)
+    text = re.sub(_number_re, _expand_number, text)
+    return text

egs/ljspeech/TTS/matcha_tts/text/symbols.py

@@ -0,0 +1,17 @@
+""" from https://github.com/keithito/tacotron
+
+Defines the set of symbols used in text input to the model.
+"""
+_pad = "_"
+_punctuation = ';:,.!?¡¿—…"«»“” '
+_letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+_letters_ipa = (
+    "ɑɐɒæɓʙβɔɕçɗɖðʤəɘɚɛɜɝɞɟʄɡɠɢʛɦɧħɥʜɨɪʝɭɬɫɮʟɱɯɰŋɳɲɴøɵɸθœɶʘɹɺɾɻʀʁɽʂʃʈʧʉʊʋⱱʌɣɤʍχʎʏʑʐʒʔʡʕʢǀǁǂǃˈˌːˑʼʴʰʱʲʷˠˤ˞↓↑→↗↘'̩'ᵻ"
+)
+
+
+# Export all symbols:
+symbols = [_pad] + list(_punctuation) + list(_letters) + list(_letters_ipa)
+
+# Special symbol ids
+SPACE_ID = symbols.index(" ")

egs/ljspeech/TTS/matcha_tts/train.py

@@ -0,0 +1,122 @@
+from typing import Any, Dict, List, Optional, Tuple
+
+import hydra
+import lightning as L
+import rootutils
+from lightning import Callback, LightningDataModule, LightningModule, Trainer
+from lightning.pytorch.loggers import Logger
+from omegaconf import DictConfig
+
+from matcha import utils
+
+rootutils.setup_root(__file__, indicator=".project-root", pythonpath=True)
+# ------------------------------------------------------------------------------------ #
+# the setup_root above is equivalent to:
+# - adding project root dir to PYTHONPATH
+#       (so you don't need to force user to install project as a package)
+#       (necessary before importing any local modules e.g. `from src import utils`)
+# - setting up PROJECT_ROOT environment variable
+#       (which is used as a base for paths in "configs/paths/default.yaml")
+#       (this way all filepaths are the same no matter where you run the code)
+# - loading environment variables from ".env" in root dir
+#
+# you can remove it if you:
+# 1. either install project as a package or move entry files to project root dir
+# 2. set `root_dir` to "." in "configs/paths/default.yaml"
+#
+# more info: https://github.com/ashleve/rootutils
+# ------------------------------------------------------------------------------------ #
+
+
+log = utils.get_pylogger(__name__)
+
+
+@utils.task_wrapper
+def train(cfg: DictConfig) -> Tuple[Dict[str, Any], Dict[str, Any]]:
+    """Trains the model. Can additionally evaluate on a testset, using best weights obtained during
+    training.
+
+    This method is wrapped in optional @task_wrapper decorator, that controls the behavior during
+    failure. Useful for multiruns, saving info about the crash, etc.
+
+    :param cfg: A DictConfig configuration composed by Hydra.
+    :return: A tuple with metrics and dict with all instantiated objects.
+    """
+    # set seed for random number generators in pytorch, numpy and python.random
+    if cfg.get("seed"):
+        L.seed_everything(cfg.seed, workers=True)
+
+    log.info(f"Instantiating datamodule <{cfg.data._target_}>")  # pylint: disable=protected-access
+    datamodule: LightningDataModule = hydra.utils.instantiate(cfg.data)
+
+    log.info(f"Instantiating model <{cfg.model._target_}>")  # pylint: disable=protected-access
+    model: LightningModule = hydra.utils.instantiate(cfg.model)
+
+    log.info("Instantiating callbacks...")
+    callbacks: List[Callback] = utils.instantiate_callbacks(cfg.get("callbacks"))
+
+    log.info("Instantiating loggers...")
+    logger: List[Logger] = utils.instantiate_loggers(cfg.get("logger"))
+
+    log.info(f"Instantiating trainer <{cfg.trainer._target_}>")  # pylint: disable=protected-access
+    trainer: Trainer = hydra.utils.instantiate(cfg.trainer, callbacks=callbacks, logger=logger)
+
+    object_dict = {
+        "cfg": cfg,
+        "datamodule": datamodule,
+        "model": model,
+        "callbacks": callbacks,
+        "logger": logger,
+        "trainer": trainer,
+    }
+
+    if logger:
+        log.info("Logging hyperparameters!")
+        utils.log_hyperparameters(object_dict)
+
+    if cfg.get("train"):
+        log.info("Starting training!")
+        trainer.fit(model=model, datamodule=datamodule, ckpt_path=cfg.get("ckpt_path"))
+
+    train_metrics = trainer.callback_metrics
+
+    if cfg.get("test"):
+        log.info("Starting testing!")
+        ckpt_path = trainer.checkpoint_callback.best_model_path
+        if ckpt_path == "":
+            log.warning("Best ckpt not found! Using current weights for testing...")
+            ckpt_path = None
+        trainer.test(model=model, datamodule=datamodule, ckpt_path=ckpt_path)
+        log.info(f"Best ckpt path: {ckpt_path}")
+
+    test_metrics = trainer.callback_metrics
+
+    # merge train and test metrics
+    metric_dict = {**train_metrics, **test_metrics}
+
+    return metric_dict, object_dict
+
+
+@hydra.main(version_base="1.3", config_path="../configs", config_name="train.yaml")
+def main(cfg: DictConfig) -> Optional[float]:
+    """Main entry point for training.
+
+    :param cfg: DictConfig configuration composed by Hydra.
+    :return: Optional[float] with optimized metric value.
+    """
+    # apply extra utilities
+    # (e.g. ask for tags if none are provided in cfg, print cfg tree, etc.)
+    utils.extras(cfg)
+
+    # train the model
+    metric_dict, _ = train(cfg)
+
+    # safely retrieve metric value for hydra-based hyperparameter optimization
+    metric_value = utils.get_metric_value(metric_dict=metric_dict, metric_name=cfg.get("optimized_metric"))
+
+    # return optimized metric
+    return metric_value
+
+
+if __name__ == "__main__":
+    main()  # pylint: disable=no-value-for-parameter

egs/ljspeech/TTS/matcha_tts/utils/__init__.py

@@ -0,0 +1,5 @@
+from matcha.utils.instantiators import instantiate_callbacks, instantiate_loggers
+from matcha.utils.logging_utils import log_hyperparameters
+from matcha.utils.pylogger import get_pylogger
+from matcha.utils.rich_utils import enforce_tags, print_config_tree
+from matcha.utils.utils import extras, get_metric_value, task_wrapper

egs/ljspeech/TTS/matcha_tts/utils/audio.py

@@ -0,0 +1,82 @@
+import numpy as np
+import torch
+import torch.utils.data
+from librosa.filters import mel as librosa_mel_fn
+from scipy.io.wavfile import read
+
+MAX_WAV_VALUE = 32768.0
+
+
+def load_wav(full_path):
+    sampling_rate, data = read(full_path)
+    return data, sampling_rate
+
+
+def dynamic_range_compression(x, C=1, clip_val=1e-5):
+    return np.log(np.clip(x, a_min=clip_val, a_max=None) * C)
+
+
+def dynamic_range_decompression(x, C=1):
+    return np.exp(x) / C
+
+
+def dynamic_range_compression_torch(x, C=1, clip_val=1e-5):
+    return torch.log(torch.clamp(x, min=clip_val) * C)
+
+
+def dynamic_range_decompression_torch(x, C=1):
+    return torch.exp(x) / C
+
+
+def spectral_normalize_torch(magnitudes):
+    output = dynamic_range_compression_torch(magnitudes)
+    return output
+
+
+def spectral_de_normalize_torch(magnitudes):
+    output = dynamic_range_decompression_torch(magnitudes)
+    return output
+
+
+mel_basis = {}
+hann_window = {}
+
+
+def mel_spectrogram(y, n_fft, num_mels, sampling_rate, hop_size, win_size, fmin, fmax, center=False):
+    if torch.min(y) < -1.0:
+        print("min value is ", torch.min(y))
+    if torch.max(y) > 1.0:
+        print("max value is ", torch.max(y))
+
+    global mel_basis, hann_window  # pylint: disable=global-statement
+    if f"{str(fmax)}_{str(y.device)}" not in mel_basis:
+        mel = librosa_mel_fn(sr=sampling_rate, n_fft=n_fft, n_mels=num_mels, fmin=fmin, fmax=fmax)
+        mel_basis[str(fmax) + "_" + str(y.device)] = torch.from_numpy(mel).float().to(y.device)
+        hann_window[str(y.device)] = torch.hann_window(win_size).to(y.device)
+
+    y = torch.nn.functional.pad(
+        y.unsqueeze(1), (int((n_fft - hop_size) / 2), int((n_fft - hop_size) / 2)), mode="reflect"
+    )
+    y = y.squeeze(1)
+
+    spec = torch.view_as_real(
+        torch.stft(
+            y,
+            n_fft,
+            hop_length=hop_size,
+            win_length=win_size,
+            window=hann_window[str(y.device)],
+            center=center,
+            pad_mode="reflect",
+            normalized=False,
+            onesided=True,
+            return_complex=True,
+        )
+    )
+
+    spec = torch.sqrt(spec.pow(2).sum(-1) + (1e-9))
+
+    spec = torch.matmul(mel_basis[str(fmax) + "_" + str(y.device)], spec)
+    spec = spectral_normalize_torch(spec)
+
+    return spec

egs/ljspeech/TTS/matcha_tts/utils/generate_data_statistics.py

@@ -0,0 +1,113 @@
+r"""
+The file creates a pickle file where the values needed for loading of dataset is stored and the model can load it
+when needed.
+
+Parameters from hparam.py will be used
+"""
+import argparse
+import json
+import os
+import sys
+from pathlib import Path
+
+import rootutils
+import torch
+from hydra import compose, initialize
+from omegaconf import open_dict
+from tqdm.auto import tqdm
+
+from matcha.data.text_mel_datamodule import TextMelDataModule
+from matcha.utils.logging_utils import pylogger
+
+log = pylogger.get_pylogger(__name__)
+
+
+def compute_data_statistics(data_loader: torch.utils.data.DataLoader, out_channels: int):
+    """Generate data mean and standard deviation helpful in data normalisation
+
+    Args:
+        data_loader (torch.utils.data.Dataloader): _description_
+        out_channels (int): mel spectrogram channels
+    """
+    total_mel_sum = 0
+    total_mel_sq_sum = 0
+    total_mel_len = 0
+
+    for batch in tqdm(data_loader, leave=False):
+        mels = batch["y"]
+        mel_lengths = batch["y_lengths"]
+
+        total_mel_len += torch.sum(mel_lengths)
+        total_mel_sum += torch.sum(mels)
+        total_mel_sq_sum += torch.sum(torch.pow(mels, 2))
+
+    data_mean = total_mel_sum / (total_mel_len * out_channels)
+    data_std = torch.sqrt((total_mel_sq_sum / (total_mel_len * out_channels)) - torch.pow(data_mean, 2))
+
+    return {"mel_mean": data_mean.item(), "mel_std": data_std.item()}
+
+
+def main():
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        "-i",
+        "--input-config",
+        type=str,
+        default="vctk.yaml",
+        help="The name of the yaml config file under configs/data",
+    )
+
+    parser.add_argument(
+        "-b",
+        "--batch-size",
+        type=int,
+        default="256",
+        help="Can have increased batch size for faster computation",
+    )
+
+    parser.add_argument(
+        "-f",
+        "--force",
+        action="store_true",
+        default=False,
+        required=False,
+        help="force overwrite the file",
+    )
+    args = parser.parse_args()
+    output_file = Path(args.input_config).with_suffix(".json")
+
+    if os.path.exists(output_file) and not args.force:
+        print("File already exists. Use -f to force overwrite")
+        sys.exit(1)
+
+    with initialize(version_base="1.3", config_path="../../configs/data"):
+        cfg = compose(config_name=args.input_config, return_hydra_config=True, overrides=[])
+
+    root_path = rootutils.find_root(search_from=__file__, indicator=".project-root")
+
+    with open_dict(cfg):
+        print(cfg)
+        del cfg["hydra"]
+        del cfg["_target_"]
+        cfg["data_statistics"] = None
+        cfg["seed"] = 1234
+        cfg["batch_size"] = args.batch_size
+        cfg["train_filelist_path"] = str(os.path.join(root_path, cfg["train_filelist_path"]))
+        cfg["valid_filelist_path"] = str(os.path.join(root_path, cfg["valid_filelist_path"]))
+        cfg["load_durations"] = False
+
+    text_mel_datamodule = TextMelDataModule(**cfg)
+    text_mel_datamodule.setup()
+    data_loader = text_mel_datamodule.train_dataloader()
+    log.info("Dataloader loaded! Now computing stats...")
+    params = compute_data_statistics(data_loader, cfg["n_feats"])
+    print(params)
+    json.dump(
+        params,
+        open(output_file, "w"),
+    )
+
+
+if __name__ == "__main__":
+    main()

egs/ljspeech/TTS/matcha_tts/utils/get_durations_from_trained_model.py

@@ -0,0 +1,195 @@
+r"""
+The file creates a pickle file where the values needed for loading of dataset is stored and the model can load it
+when needed.
+
+Parameters from hparam.py will be used
+"""
+import argparse
+import json
+import os
+import sys
+from pathlib import Path
+
+import lightning
+import numpy as np
+import rootutils
+import torch
+from hydra import compose, initialize
+from omegaconf import open_dict
+from torch import nn
+from tqdm.auto import tqdm
+
+from matcha.cli import get_device
+from matcha.data.text_mel_datamodule import TextMelDataModule
+from matcha.models.matcha_tts import MatchaTTS
+from matcha.utils.logging_utils import pylogger
+from matcha.utils.utils import get_phoneme_durations
+
+log = pylogger.get_pylogger(__name__)
+
+
+def save_durations_to_folder(
+    attn: torch.Tensor, x_length: int, y_length: int, filepath: str, output_folder: Path, text: str
+):
+    durations = attn.squeeze().sum(1)[:x_length].numpy()
+    durations_json = get_phoneme_durations(durations, text)
+    output = output_folder / Path(filepath).name.replace(".wav", ".npy")
+    with open(output.with_suffix(".json"), "w", encoding="utf-8") as f:
+        json.dump(durations_json, f, indent=4, ensure_ascii=False)
+
+    np.save(output, durations)
+
+
+@torch.inference_mode()
+def compute_durations(data_loader: torch.utils.data.DataLoader, model: nn.Module, device: torch.device, output_folder):
+    """Generate durations from the model for each datapoint and save it in a folder
+
+    Args:
+        data_loader (torch.utils.data.DataLoader): Dataloader
+        model (nn.Module): MatchaTTS model
+        device (torch.device): GPU or CPU
+    """
+
+    for batch in tqdm(data_loader, desc="🍵 Computing durations 🍵:"):
+        x, x_lengths = batch["x"], batch["x_lengths"]
+        y, y_lengths = batch["y"], batch["y_lengths"]
+        spks = batch["spks"]
+        x = x.to(device)
+        y = y.to(device)
+        x_lengths = x_lengths.to(device)
+        y_lengths = y_lengths.to(device)
+        spks = spks.to(device) if spks is not None else None
+
+        _, _, _, attn = model(
+            x=x,
+            x_lengths=x_lengths,
+            y=y,
+            y_lengths=y_lengths,
+            spks=spks,
+        )
+        attn = attn.cpu()
+        for i in range(attn.shape[0]):
+            save_durations_to_folder(
+                attn[i],
+                x_lengths[i].item(),
+                y_lengths[i].item(),
+                batch["filepaths"][i],
+                output_folder,
+                batch["x_texts"][i],
+            )
+
+
+def main():
+    parser = argparse.ArgumentParser()
+
+    parser.add_argument(
+        "-i",
+        "--input-config",
+        type=str,
+        default="ljspeech.yaml",
+        help="The name of the yaml config file under configs/data",
+    )
+
+    parser.add_argument(
+        "-b",
+        "--batch-size",
+        type=int,
+        default="32",
+        help="Can have increased batch size for faster computation",
+    )
+
+    parser.add_argument(
+        "-f",
+        "--force",
+        action="store_true",
+        default=False,
+        required=False,
+        help="force overwrite the file",
+    )
+    parser.add_argument(
+        "-c",
+        "--checkpoint_path",
+        type=str,
+        required=True,
+        help="Path to the checkpoint file to load the model from",
+    )
+
+    parser.add_argument(
+        "-o",
+        "--output-folder",
+        type=str,
+        default=None,
+        help="Output folder to save the data statistics",
+    )
+
+    parser.add_argument(
+        "--cpu", action="store_true", help="Use CPU for inference, not recommended (default: use GPU if available)"
+    )
+
+    args = parser.parse_args()
+
+    with initialize(version_base="1.3", config_path="../../configs/data"):
+        cfg = compose(config_name=args.input_config, return_hydra_config=True, overrides=[])
+
+    root_path = rootutils.find_root(search_from=__file__, indicator=".project-root")
+
+    with open_dict(cfg):
+        del cfg["hydra"]
+        del cfg["_target_"]
+        cfg["seed"] = 1234
+        cfg["batch_size"] = args.batch_size
+        cfg["train_filelist_path"] = str(os.path.join(root_path, cfg["train_filelist_path"]))
+        cfg["valid_filelist_path"] = str(os.path.join(root_path, cfg["valid_filelist_path"]))
+        cfg["load_durations"] = False
+
+    if args.output_folder is not None:
+        output_folder = Path(args.output_folder)
+    else:
+        output_folder = Path(cfg["train_filelist_path"]).parent / "durations"
+
+    print(f"Output folder set to: {output_folder}")
+
+    if os.path.exists(output_folder) and not args.force:
+        print("Folder already exists. Use -f to force overwrite")
+        sys.exit(1)
+
+    output_folder.mkdir(parents=True, exist_ok=True)
+
+    print(f"Preprocessing: {cfg['name']} from training filelist: {cfg['train_filelist_path']}")
+    print("Loading model...")
+    device = get_device(args)
+    model = MatchaTTS.load_from_checkpoint(args.checkpoint_path, map_location=device)
+
+    text_mel_datamodule = TextMelDataModule(**cfg)
+    text_mel_datamodule.setup()
+    try:
+        print("Computing stats for training set if exists...")
+        train_dataloader = text_mel_datamodule.train_dataloader()
+        compute_durations(train_dataloader, model, device, output_folder)
+    except lightning.fabric.utilities.exceptions.MisconfigurationException:
+        print("No training set found")
+
+    try:
+        print("Computing stats for validation set if exists...")
+        val_dataloader = text_mel_datamodule.val_dataloader()
+        compute_durations(val_dataloader, model, device, output_folder)
+    except lightning.fabric.utilities.exceptions.MisconfigurationException:
+        print("No validation set found")
+
+    try:
+        print("Computing stats for test set if exists...")
+        test_dataloader = text_mel_datamodule.test_dataloader()
+        compute_durations(test_dataloader, model, device, output_folder)
+    except lightning.fabric.utilities.exceptions.MisconfigurationException:
+        print("No test set found")
+
+    print(f"[+] Done! Data statistics saved to: {output_folder}")
+
+
+if __name__ == "__main__":
+    # Helps with generating durations for the dataset to train other architectures
+    # that cannot learn to align due to limited size of dataset
+    # Example usage:
+    # python python matcha/utils/get_durations_from_trained_model.py -i ljspeech.yaml -c pretrained_model
+    # This will create a folder in data/processed_data/durations/ljspeech with the durations
+    main()

egs/ljspeech/TTS/matcha_tts/utils/instantiators.py

@@ -0,0 +1,56 @@
+from typing import List
+
+import hydra
+from lightning import Callback
+from lightning.pytorch.loggers import Logger
+from omegaconf import DictConfig
+
+from matcha.utils import pylogger
+
+log = pylogger.get_pylogger(__name__)
+
+
+def instantiate_callbacks(callbacks_cfg: DictConfig) -> List[Callback]:
+    """Instantiates callbacks from config.
+
+    :param callbacks_cfg: A DictConfig object containing callback configurations.
+    :return: A list of instantiated callbacks.
+    """
+    callbacks: List[Callback] = []
+
+    if not callbacks_cfg:
+        log.warning("No callback configs found! Skipping..")
+        return callbacks
+
+    if not isinstance(callbacks_cfg, DictConfig):
+        raise TypeError("Callbacks config must be a DictConfig!")
+
+    for _, cb_conf in callbacks_cfg.items():
+        if isinstance(cb_conf, DictConfig) and "_target_" in cb_conf:
+            log.info(f"Instantiating callback <{cb_conf._target_}>")  # pylint: disable=protected-access
+            callbacks.append(hydra.utils.instantiate(cb_conf))
+
+    return callbacks
+
+
+def instantiate_loggers(logger_cfg: DictConfig) -> List[Logger]:
+    """Instantiates loggers from config.
+
+    :param logger_cfg: A DictConfig object containing logger configurations.
+    :return: A list of instantiated loggers.
+    """
+    logger: List[Logger] = []
+
+    if not logger_cfg:
+        log.warning("No logger configs found! Skipping...")
+        return logger
+
+    if not isinstance(logger_cfg, DictConfig):
+        raise TypeError("Logger config must be a DictConfig!")
+
+    for _, lg_conf in logger_cfg.items():
+        if isinstance(lg_conf, DictConfig) and "_target_" in lg_conf:
+            log.info(f"Instantiating logger <{lg_conf._target_}>")  # pylint: disable=protected-access
+            logger.append(hydra.utils.instantiate(lg_conf))
+
+    return logger

egs/ljspeech/TTS/matcha_tts/utils/logging_utils.py

@@ -0,0 +1,53 @@
+from typing import Any, Dict
+
+from lightning.pytorch.utilities import rank_zero_only
+from omegaconf import OmegaConf
+
+from matcha.utils import pylogger
+
+log = pylogger.get_pylogger(__name__)
+
+
+@rank_zero_only
+def log_hyperparameters(object_dict: Dict[str, Any]) -> None:
+    """Controls which config parts are saved by Lightning loggers.
+
+    Additionally saves:
+        - Number of model parameters
+
+    :param object_dict: A dictionary containing the following objects:
+        - `"cfg"`: A DictConfig object containing the main config.
+        - `"model"`: The Lightning model.
+        - `"trainer"`: The Lightning trainer.
+    """
+    hparams = {}
+
+    cfg = OmegaConf.to_container(object_dict["cfg"])
+    model = object_dict["model"]
+    trainer = object_dict["trainer"]
+
+    if not trainer.logger:
+        log.warning("Logger not found! Skipping hyperparameter logging...")
+        return
+
+    hparams["model"] = cfg["model"]
+
+    # save number of model parameters
+    hparams["model/params/total"] = sum(p.numel() for p in model.parameters())
+    hparams["model/params/trainable"] = sum(p.numel() for p in model.parameters() if p.requires_grad)
+    hparams["model/params/non_trainable"] = sum(p.numel() for p in model.parameters() if not p.requires_grad)
+
+    hparams["data"] = cfg["data"]
+    hparams["trainer"] = cfg["trainer"]
+
+    hparams["callbacks"] = cfg.get("callbacks")
+    hparams["extras"] = cfg.get("extras")
+
+    hparams["task_name"] = cfg.get("task_name")
+    hparams["tags"] = cfg.get("tags")
+    hparams["ckpt_path"] = cfg.get("ckpt_path")
+    hparams["seed"] = cfg.get("seed")
+
+    # send hparams to all loggers
+    for logger in trainer.loggers:
+        logger.log_hyperparams(hparams)

egs/ljspeech/TTS/matcha_tts/utils/model.py

@@ -0,0 +1,90 @@
+""" from https://github.com/jaywalnut310/glow-tts """
+
+import numpy as np
+import torch
+
+
+def sequence_mask(length, max_length=None):
+    if max_length is None:
+        max_length = length.max()
+    x = torch.arange(max_length, dtype=length.dtype, device=length.device)
+    return x.unsqueeze(0) < length.unsqueeze(1)
+
+
+def fix_len_compatibility(length, num_downsamplings_in_unet=2):
+    factor = torch.scalar_tensor(2).pow(num_downsamplings_in_unet)
+    length = (length / factor).ceil() * factor
+    if not torch.onnx.is_in_onnx_export():
+        return length.int().item()
+    else:
+        return length
+
+
+def convert_pad_shape(pad_shape):
+    inverted_shape = pad_shape[::-1]
+    pad_shape = [item for sublist in inverted_shape for item in sublist]
+    return pad_shape
+
+
+def generate_path(duration, mask):
+    device = duration.device
+
+    b, t_x, t_y = mask.shape
+    cum_duration = torch.cumsum(duration, 1)
+    path = torch.zeros(b, t_x, t_y, dtype=mask.dtype).to(device=device)
+
+    cum_duration_flat = cum_duration.view(b * t_x)
+    path = sequence_mask(cum_duration_flat, t_y).to(mask.dtype)
+    path = path.view(b, t_x, t_y)
+    path = path - torch.nn.functional.pad(path, convert_pad_shape([[0, 0], [1, 0], [0, 0]]))[:, :-1]
+    path = path * mask
+    return path
+
+
+def duration_loss(logw, logw_, lengths):
+    loss = torch.sum((logw - logw_) ** 2) / torch.sum(lengths)
+    return loss
+
+
+def normalize(data, mu, std):
+    if not isinstance(mu, (float, int)):
+        if isinstance(mu, list):
+            mu = torch.tensor(mu, dtype=data.dtype, device=data.device)
+        elif isinstance(mu, torch.Tensor):
+            mu = mu.to(data.device)
+        elif isinstance(mu, np.ndarray):
+            mu = torch.from_numpy(mu).to(data.device)
+        mu = mu.unsqueeze(-1)
+
+    if not isinstance(std, (float, int)):
+        if isinstance(std, list):
+            std = torch.tensor(std, dtype=data.dtype, device=data.device)
+        elif isinstance(std, torch.Tensor):
+            std = std.to(data.device)
+        elif isinstance(std, np.ndarray):
+            std = torch.from_numpy(std).to(data.device)
+        std = std.unsqueeze(-1)
+
+    return (data - mu) / std
+
+
+def denormalize(data, mu, std):
+    if not isinstance(mu, float):
+        if isinstance(mu, list):
+            mu = torch.tensor(mu, dtype=data.dtype, device=data.device)
+        elif isinstance(mu, torch.Tensor):
+            mu = mu.to(data.device)
+        elif isinstance(mu, np.ndarray):
+            mu = torch.from_numpy(mu).to(data.device)
+        mu = mu.unsqueeze(-1)
+
+    if not isinstance(std, float):
+        if isinstance(std, list):
+            std = torch.tensor(std, dtype=data.dtype, device=data.device)
+        elif isinstance(std, torch.Tensor):
+            std = std.to(data.device)
+        elif isinstance(std, np.ndarray):
+            std = torch.from_numpy(std).to(data.device)
+        std = std.unsqueeze(-1)
+
+    return data * std + mu

egs/ljspeech/TTS/matcha_tts/utils/monotonic_align/__init__.py

@@ -0,0 +1,22 @@
+import numpy as np
+import torch
+
+from matcha.utils.monotonic_align.core import maximum_path_c
+
+
+def maximum_path(value, mask):
+    """Cython optimised version.
+    value: [b, t_x, t_y]
+    mask: [b, t_x, t_y]
+    """
+    value = value * mask
+    device = value.device
+    dtype = value.dtype
+    value = value.data.cpu().numpy().astype(np.float32)
+    path = np.zeros_like(value).astype(np.int32)
+    mask = mask.data.cpu().numpy()
+
+    t_x_max = mask.sum(1)[:, 0].astype(np.int32)
+    t_y_max = mask.sum(2)[:, 0].astype(np.int32)
+    maximum_path_c(path, value, t_x_max, t_y_max)
+    return torch.from_numpy(path).to(device=device, dtype=dtype)

egs/ljspeech/TTS/matcha_tts/utils/monotonic_align/core.pyx

@@ -0,0 +1,47 @@
+import numpy as np
+
+cimport cython
+cimport numpy as np
+
+from cython.parallel import prange
+
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
+cdef void maximum_path_each(int[:,::1] path, float[:,::1] value, int t_x, int t_y, float max_neg_val) nogil:
+  cdef int x
+  cdef int y
+  cdef float v_prev
+  cdef float v_cur
+  cdef float tmp
+  cdef int index = t_x - 1
+
+  for y in range(t_y):
+    for x in range(max(0, t_x + y - t_y), min(t_x, y + 1)):
+      if x == y:
+        v_cur = max_neg_val
+      else:
+        v_cur = value[x, y-1]
+      if x == 0:
+        if y == 0:
+          v_prev = 0.
+        else:
+          v_prev = max_neg_val
+      else:
+        v_prev = value[x-1, y-1]
+      value[x, y] = max(v_cur, v_prev) + value[x, y]
+
+  for y in range(t_y - 1, -1, -1):
+    path[index, y] = 1
+    if index != 0 and (index == y or value[index, y-1] < value[index-1, y-1]):
+      index = index - 1
+
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
+cpdef void maximum_path_c(int[:,:,::1] paths, float[:,:,::1] values, int[::1] t_xs, int[::1] t_ys, float max_neg_val=-1e9) nogil:
+  cdef int b = values.shape[0]
+
+  cdef int i
+  for i in prange(b, nogil=True):
+    maximum_path_each(paths[i], values[i], t_xs[i], t_ys[i], max_neg_val)

egs/ljspeech/TTS/matcha_tts/utils/monotonic_align/setup.py

@@ -0,0 +1,9 @@
+from distutils.core import setup
+from Cython.Build import cythonize
+import numpy
+
+setup(
+    name="monotonic_align",
+    ext_modules=cythonize("core.pyx"),
+    include_dirs=[numpy.get_include()],
+)

egs/ljspeech/TTS/matcha_tts/utils/pylogger.py

@@ -0,0 +1,21 @@
+import logging
+
+from lightning.pytorch.utilities import rank_zero_only
+
+
+def get_pylogger(name: str = __name__) -> logging.Logger:
+    """Initializes a multi-GPU-friendly python command line logger.
+
+    :param name: The name of the logger, defaults to ``__name__``.
+
+    :return: A logger object.
+    """
+    logger = logging.getLogger(name)
+
+    # this ensures all logging levels get marked with the rank zero decorator
+    # otherwise logs would get multiplied for each GPU process in multi-GPU setup
+    logging_levels = ("debug", "info", "warning", "error", "exception", "fatal", "critical")
+    for level in logging_levels:
+        setattr(logger, level, rank_zero_only(getattr(logger, level)))
+
+    return logger

egs/ljspeech/TTS/matcha_tts/utils/rich_utils.py

@@ -0,0 +1,101 @@
+from pathlib import Path
+from typing import Sequence
+
+import rich
+import rich.syntax
+import rich.tree
+from hydra.core.hydra_config import HydraConfig
+from lightning.pytorch.utilities import rank_zero_only
+from omegaconf import DictConfig, OmegaConf, open_dict
+from rich.prompt import Prompt
+
+from matcha.utils import pylogger
+
+log = pylogger.get_pylogger(__name__)
+
+
+@rank_zero_only
+def print_config_tree(
+    cfg: DictConfig,
+    print_order: Sequence[str] = (
+        "data",
+        "model",
+        "callbacks",
+        "logger",
+        "trainer",
+        "paths",
+        "extras",
+    ),
+    resolve: bool = False,
+    save_to_file: bool = False,
+) -> None:
+    """Prints the contents of a DictConfig as a tree structure using the Rich library.
+
+    :param cfg: A DictConfig composed by Hydra.
+    :param print_order: Determines in what order config components are printed. Default is ``("data", "model",
+    "callbacks", "logger", "trainer", "paths", "extras")``.
+    :param resolve: Whether to resolve reference fields of DictConfig. Default is ``False``.
+    :param save_to_file: Whether to export config to the hydra output folder. Default is ``False``.
+    """
+    style = "dim"
+    tree = rich.tree.Tree("CONFIG", style=style, guide_style=style)
+
+    queue = []
+
+    # add fields from `print_order` to queue
+    for field in print_order:
+        _ = (
+            queue.append(field)
+            if field in cfg
+            else log.warning(f"Field '{field}' not found in config. Skipping '{field}' config printing...")
+        )
+
+    # add all the other fields to queue (not specified in `print_order`)
+    for field in cfg:
+        if field not in queue:
+            queue.append(field)
+
+    # generate config tree from queue
+    for field in queue:
+        branch = tree.add(field, style=style, guide_style=style)
+
+        config_group = cfg[field]
+        if isinstance(config_group, DictConfig):
+            branch_content = OmegaConf.to_yaml(config_group, resolve=resolve)
+        else:
+            branch_content = str(config_group)
+
+        branch.add(rich.syntax.Syntax(branch_content, "yaml"))
+
+    # print config tree
+    rich.print(tree)
+
+    # save config tree to file
+    if save_to_file:
+        with open(Path(cfg.paths.output_dir, "config_tree.log"), "w") as file:
+            rich.print(tree, file=file)
+
+
+@rank_zero_only
+def enforce_tags(cfg: DictConfig, save_to_file: bool = False) -> None:
+    """Prompts user to input tags from command line if no tags are provided in config.
+
+    :param cfg: A DictConfig composed by Hydra.
+    :param save_to_file: Whether to export tags to the hydra output folder. Default is ``False``.
+    """
+    if not cfg.get("tags"):
+        if "id" in HydraConfig().cfg.hydra.job:
+            raise ValueError("Specify tags before launching a multirun!")
+
+        log.warning("No tags provided in config. Prompting user to input tags...")
+        tags = Prompt.ask("Enter a list of comma separated tags", default="dev")
+        tags = [t.strip() for t in tags.split(",") if t != ""]
+
+        with open_dict(cfg):
+            cfg.tags = tags
+
+        log.info(f"Tags: {cfg.tags}")
+
+    if save_to_file:
+        with open(Path(cfg.paths.output_dir, "tags.log"), "w") as file:
+            rich.print(cfg.tags, file=file)

egs/ljspeech/TTS/matcha_tts/utils/utils.py

@@ -0,0 +1,259 @@
+import os
+import sys
+import warnings
+from importlib.util import find_spec
+from math import ceil
+from pathlib import Path
+from typing import Any, Callable, Dict, Tuple
+
+import gdown
+import matplotlib.pyplot as plt
+import numpy as np
+import torch
+import wget
+from omegaconf import DictConfig
+
+from matcha.utils import pylogger, rich_utils
+
+log = pylogger.get_pylogger(__name__)
+
+
+def extras(cfg: DictConfig) -> None:
+    """Applies optional utilities before the task is started.
+
+    Utilities:
+        - Ignoring python warnings
+        - Setting tags from command line
+        - Rich config printing
+
+    :param cfg: A DictConfig object containing the config tree.
+    """
+    # return if no `extras` config
+    if not cfg.get("extras"):
+        log.warning("Extras config not found! <cfg.extras=null>")
+        return
+
+    # disable python warnings
+    if cfg.extras.get("ignore_warnings"):
+        log.info("Disabling python warnings! <cfg.extras.ignore_warnings=True>")
+        warnings.filterwarnings("ignore")
+
+    # prompt user to input tags from command line if none are provided in the config
+    if cfg.extras.get("enforce_tags"):
+        log.info("Enforcing tags! <cfg.extras.enforce_tags=True>")
+        rich_utils.enforce_tags(cfg, save_to_file=True)
+
+    # pretty print config tree using Rich library
+    if cfg.extras.get("print_config"):
+        log.info("Printing config tree with Rich! <cfg.extras.print_config=True>")
+        rich_utils.print_config_tree(cfg, resolve=True, save_to_file=True)
+
+
+def task_wrapper(task_func: Callable) -> Callable:
+    """Optional decorator that controls the failure behavior when executing the task function.
+
+    This wrapper can be used to:
+        - make sure loggers are closed even if the task function raises an exception (prevents multirun failure)
+        - save the exception to a `.log` file
+        - mark the run as failed with a dedicated file in the `logs/` folder (so we can find and rerun it later)
+        - etc. (adjust depending on your needs)
+
+    Example:
+    ```
+    @utils.task_wrapper
+    def train(cfg: DictConfig) -> Tuple[Dict[str, Any], Dict[str, Any]]:
+        ...
+        return metric_dict, object_dict
+    ```
+
+    :param task_func: The task function to be wrapped.
+
+    :return: The wrapped task function.
+    """
+
+    def wrap(cfg: DictConfig) -> Tuple[Dict[str, Any], Dict[str, Any]]:
+        # execute the task
+        try:
+            metric_dict, object_dict = task_func(cfg=cfg)
+
+        # things to do if exception occurs
+        except Exception as ex:
+            # save exception to `.log` file
+            log.exception("")
+
+            # some hyperparameter combinations might be invalid or cause out-of-memory errors
+            # so when using hparam search plugins like Optuna, you might want to disable
+            # raising the below exception to avoid multirun failure
+            raise ex
+
+        # things to always do after either success or exception
+        finally:
+            # display output dir path in terminal
+            log.info(f"Output dir: {cfg.paths.output_dir}")
+
+            # always close wandb run (even if exception occurs so multirun won't fail)
+            if find_spec("wandb"):  # check if wandb is installed
+                import wandb
+
+                if wandb.run:
+                    log.info("Closing wandb!")
+                    wandb.finish()
+
+        return metric_dict, object_dict
+
+    return wrap
+
+
+def get_metric_value(metric_dict: Dict[str, Any], metric_name: str) -> float:
+    """Safely retrieves value of the metric logged in LightningModule.
+
+    :param metric_dict: A dict containing metric values.
+    :param metric_name: The name of the metric to retrieve.
+    :return: The value of the metric.
+    """
+    if not metric_name:
+        log.info("Metric name is None! Skipping metric value retrieval...")
+        return None
+
+    if metric_name not in metric_dict:
+        raise ValueError(
+            f"Metric value not found! <metric_name={metric_name}>\n"
+            "Make sure metric name logged in LightningModule is correct!\n"
+            "Make sure `optimized_metric` name in `hparams_search` config is correct!"
+        )
+
+    metric_value = metric_dict[metric_name].item()
+    log.info(f"Retrieved metric value! <{metric_name}={metric_value}>")
+
+    return metric_value
+
+
+def intersperse(lst, item):
+    # Adds blank symbol
+    result = [item] * (len(lst) * 2 + 1)
+    result[1::2] = lst
+    return result
+
+
+def save_figure_to_numpy(fig):
+    data = np.fromstring(fig.canvas.tostring_rgb(), dtype=np.uint8, sep="")
+    data = data.reshape(fig.canvas.get_width_height()[::-1] + (3,))
+    return data
+
+
+def plot_tensor(tensor):
+    plt.style.use("default")
+    fig, ax = plt.subplots(figsize=(12, 3))
+    im = ax.imshow(tensor, aspect="auto", origin="lower", interpolation="none")
+    plt.colorbar(im, ax=ax)
+    plt.tight_layout()
+    fig.canvas.draw()
+    data = save_figure_to_numpy(fig)
+    plt.close()
+    return data
+
+
+def save_plot(tensor, savepath):
+    plt.style.use("default")
+    fig, ax = plt.subplots(figsize=(12, 3))
+    im = ax.imshow(tensor, aspect="auto", origin="lower", interpolation="none")
+    plt.colorbar(im, ax=ax)
+    plt.tight_layout()
+    fig.canvas.draw()
+    plt.savefig(savepath)
+    plt.close()
+
+
+def to_numpy(tensor):
+    if isinstance(tensor, np.ndarray):
+        return tensor
+    elif isinstance(tensor, torch.Tensor):
+        return tensor.detach().cpu().numpy()
+    elif isinstance(tensor, list):
+        return np.array(tensor)
+    else:
+        raise TypeError("Unsupported type for conversion to numpy array")
+
+
+def get_user_data_dir(appname="matcha_tts"):
+    """
+    Args:
+        appname (str): Name of application
+
+    Returns:
+        Path: path to user data directory
+    """
+
+    MATCHA_HOME = os.environ.get("MATCHA_HOME")
+    if MATCHA_HOME is not None:
+        ans = Path(MATCHA_HOME).expanduser().resolve(strict=False)
+    elif sys.platform == "win32":
+        import winreg  # pylint: disable=import-outside-toplevel
+
+        key = winreg.OpenKey(
+            winreg.HKEY_CURRENT_USER,
+            r"Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders",
+        )
+        dir_, _ = winreg.QueryValueEx(key, "Local AppData")
+        ans = Path(dir_).resolve(strict=False)
+    elif sys.platform == "darwin":
+        ans = Path("~/Library/Application Support/").expanduser()
+    else:
+        ans = Path.home().joinpath(".local/share")
+
+    final_path = ans.joinpath(appname)
+    final_path.mkdir(parents=True, exist_ok=True)
+    return final_path
+
+
+def assert_model_downloaded(checkpoint_path, url, use_wget=True):
+    if Path(checkpoint_path).exists():
+        log.debug(f"[+] Model already present at {checkpoint_path}!")
+        print(f"[+] Model already present at {checkpoint_path}!")
+        return
+    log.info(f"[-] Model not found at {checkpoint_path}! Will download it")
+    print(f"[-] Model not found at {checkpoint_path}! Will download it")
+    checkpoint_path = str(checkpoint_path)
+    if not use_wget:
+        gdown.download(url=url, output=checkpoint_path, quiet=False, fuzzy=True)
+    else:
+        wget.download(url=url, out=checkpoint_path)
+
+
+def get_phoneme_durations(durations, phones):
+    prev = durations[0]
+    merged_durations = []
+    # Convolve with stride 2
+    for i in range(1, len(durations), 2):
+        if i == len(durations) - 2:
+            # if it is last take full value
+            next_half = durations[i + 1]
+        else:
+            next_half = ceil(durations[i + 1] / 2)
+
+        curr = prev + durations[i] + next_half
+        prev = durations[i + 1] - next_half
+        merged_durations.append(curr)
+
+    assert len(phones) == len(merged_durations)
+    assert len(merged_durations) == (len(durations) - 1) // 2
+
+    merged_durations = torch.cumsum(torch.tensor(merged_durations), 0, dtype=torch.long)
+    start = torch.tensor(0)
+    duration_json = []
+    for i, duration in enumerate(merged_durations):
+        duration_json.append(
+            {
+                phones[i]: {
+                    "starttime": start.item(),
+                    "endtime": duration.item(),
+                    "duration": duration.item() - start.item(),
+                }
+            }
+        )
+        start = duration
+
+    assert list(duration_json[-1].values())[0]["endtime"] == sum(
+        durations
+    ), f"{list(duration_json[-1].values())[0]['endtime'],  sum(durations)}"
+    return duration_json