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support torch script.

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Fangjun Kuang 2022-06-20 12:30:49 +08:00
parent 493b96e3c4
commit 2d684f11bf
8 changed files with 729 additions and 22 deletions
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1
egs/aishell/ASR/README.md
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@ -4,7 +4,6 @@
Please refer to <https://icefall.readthedocs.io/en/latest/recipes/aishell/index.html>
for how to run models in this recipe.
# Pruned transducer stateless 3
# Transducers

77
egs/aishell/ASR/RESULTS.md
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@ -1,10 +1,85 @@
## Results
### Aishell training result(Transducer-stateless)
### Aishell training result(Stateless Transducer)
#### Pruned transducer stateless 3
See <https://github.com/k2-fsa/icefall/pull/436>
[./pruned_transducer_stateless3](./pruned_transducer_stateless3)
It uses pruned RNN-T.
| | test | dev | comment |
|------------------------|------|------|---------------------------------------|
| greedy search | 5.39 | 5.09 | --epoch 29 --avg 5 --max-duration 600 |
| modified beam search | 5.05 | 4.79 | --epoch 29 --avg 5 --max-duration 600 |
| fast beam search | 5.13 | 4.91 | --epoch 29 --avg 5 --max-duration 600 |
Training command is:
```bash
export CUDA_VISIBLE_DEVICES="4,5,6,7"
./pruned_transducer_stateless3/train.py \
--exp-dir ./pruned_transducer_stateless3/exp-context-size-1 \
--world-size 4 \
--max-duration 200 \
--datatang-prob 0.5 \
--start-epoch 1 \
--num-epochs 30 \
--use-fp16 1 \
--num-encoder-layers 12 \
--dim-feedforward 2048 \
--nhead 8 \
--encoder-dim 512 \
--context-size 1 \
--decoder-dim 512 \
--joiner-dim 512 \
--master-port 12356
```
**Caution**: It uses `--context-size=1`.
The tensorboard log is available at
<https://tensorboard.dev/experiment/OKKacljwR6ik7rbDr5gMqQ>
The decoding command is:
```bash
for epoch in 29; do
for avg in 5; do
for m in greedy_search modified_beam_search fast_beam_search; do
./pruned_transducer_stateless3/decode.py \
--exp-dir ./pruned_transducer_stateless3/exp-context-size-1 \
--epoch $epoch \
--avg $avg \
--use-averaged-model 1 \
--max-duration 600 \
--decoding-method $m \
--num-encoder-layers 12 \
--dim-feedforward 2048 \
--nhead 8 \
--context-size 1 \
--encoder-dim 512 \
--decoder-dim 512 \
--joiner-dim 512
done
done
done
```
Pretrained models, training logs, decoding logs, and decoding results
are available at
<https://huggingface.co/csukuangfj/icefall-aishell-pruned-transducer-stateless3-2022-06-20>
#### 2022-03-01
[./transducer_stateless_modified-2](./transducer_stateless_modified-2)
It uses [optimized_transducer](https://github.com/csukuangfj/optimized_transducer)
for computing RNN-T loss.
Stateless transducer + modified transducer + using [aidatatang_200zh](http://www.openslr.org/62/) as extra training data.

277
egs/aishell/ASR/pruned_transducer_stateless3/export.py Executable file
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@ -0,0 +1,277 @@
#!/usr/bin/env python3
#
# Copyright 2021 Xiaomi Corporation (Author: Fangjun Kuang)
#
# See ../../../../LICENSE for clarification regarding multiple authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This script converts several saved checkpoints
# to a single one using model averaging.
"""
Usage:
./pruned_transducer_stateless3/export.py \
--exp-dir ./pruned_transducer_stateless3/exp \
--jit 0 \
--epoch 29 \
--avg 5
It will generate a file exp_dir/pretrained-epoch-29-avg-5.pt
To use the generated file with `pruned_transducer_stateless3/decode.py`,
you can do::
cd /path/to/exp_dir
ln -s pretrained-epoch-29-avg-5.pt epoch-9999.pt
cd /path/to/egs/aishell/ASR
./pruned_transducer_stateless3/decode.py \
--exp-dir ./pruned_transducer_stateless3/exp \
--epoch 9999 \
--avg 1 \
--max-duration 100 \
--lang-dir data/lang_char
"""
import argparse
import logging
from pathlib import Path
import torch
from train import add_model_arguments, get_params, get_transducer_model
from icefall.checkpoint import (
average_checkpoints,
average_checkpoints_with_averaged_model,
find_checkpoints,
load_checkpoint,
)
from icefall.lexicon import Lexicon
from icefall.utils import str2bool
def get_parser():
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter
)
parser.add_argument(
"--epoch",
type=int,
default=29,
help="""It specifies the checkpoint to use for averaging.
Note: Epoch counts from 1.
You can specify --avg to use more checkpoints for model averaging.""",
)
parser.add_argument(
"--iter",
type=int,
default=0,
help="""If positive, --epoch is ignored and it
will use the checkpoint exp_dir/checkpoint-iter.pt.
You can specify --avg to use more checkpoints for model averaging.
""",
)
parser.add_argument(
"--avg",
type=int,
default=15,
help="Number of checkpoints to average. Automatically select "
"consecutive checkpoints before the checkpoint specified by "
"'--epoch' and '--iter'",
)
parser.add_argument(
"--use-averaged-model",
type=str2bool,
default=True,
help="Whether to load averaged model. Currently it only supports "
"using --epoch. If True, it would decode with the averaged model "
"over the epoch range from `epoch-avg` (excluded) to `epoch`."
"Actually only the models with epoch number of `epoch-avg` and "
"`epoch` are loaded for averaging. ",
)
parser.add_argument(
"--exp-dir",
type=Path,
default=Path("pruned_transducer_stateless3/exp"),
help="""It specifies the directory where all training related
files, e.g., checkpoints, log, etc, are saved
""",
)
parser.add_argument(
"--jit",
type=str2bool,
default=False,
help="""True to save a model after applying torch.jit.script.
""",
)
parser.add_argument(
"--lang-dir",
type=Path,
default=Path("data/lang_char"),
help="The lang dir",
)
parser.add_argument(
"--context-size",
type=int,
default=1,
help="The context size in the decoder. 1 means bigram; "
"2 means tri-gram",
)
add_model_arguments(parser)
return parser
def main():
args = get_parser().parse_args()
params = get_params()
params.update(vars(args))
device = torch.device("cpu")
if torch.cuda.is_available():
device = torch.device("cuda", 0)
logging.info(f"device: {device}")
lexicon = Lexicon(params.lang_dir)
params.blank_id = 0
params.vocab_size = max(lexicon.tokens) + 1
logging.info(params)
logging.info("About to create model")
model = get_transducer_model(params)
if not params.use_averaged_model:
if params.iter > 0:
filenames = find_checkpoints(
params.exp_dir, iteration=-params.iter
)[: params.avg]
if len(filenames) == 0:
raise ValueError(
f"No checkpoints found for"
f" --iter {params.iter}, --avg {params.avg}"
)
elif len(filenames) < params.avg:
raise ValueError(
f"Not enough checkpoints ({len(filenames)}) found for"
f" --iter {params.iter}, --avg {params.avg}"
)
logging.info(f"averaging {filenames}")
model.to(device)
model.load_state_dict(average_checkpoints(filenames, device=device))
elif params.avg == 1:
load_checkpoint(f"{params.exp_dir}/epoch-{params.epoch}.pt", model)
else:
start = params.epoch - params.avg + 1
filenames = []
for i in range(start, params.epoch + 1):
if i >= 1:
filenames.append(f"{params.exp_dir}/epoch-{i}.pt")
logging.info(f"averaging {filenames}")
model.to(device)
model.load_state_dict(average_checkpoints(filenames, device=device))
else:
if params.iter > 0:
filenames = find_checkpoints(
params.exp_dir, iteration=-params.iter
)[: params.avg + 1]
if len(filenames) == 0:
raise ValueError(
f"No checkpoints found for"
f" --iter {params.iter}, --avg {params.avg}"
)
elif len(filenames) < params.avg + 1:
raise ValueError(
f"Not enough checkpoints ({len(filenames)}) found for"
f" --iter {params.iter}, --avg {params.avg}"
)
filename_start = filenames[-1]
filename_end = filenames[0]
logging.info(
"Calculating the averaged model over iteration checkpoints"
f" from {filename_start} (excluded) to {filename_end}"
)
model.to(device)
model.load_state_dict(
average_checkpoints_with_averaged_model(
filename_start=filename_start,
filename_end=filename_end,
device=device,
)
)
else:
assert params.avg > 0, params.avg
start = params.epoch - params.avg
assert start >= 1, start
filename_start = f"{params.exp_dir}/epoch-{start}.pt"
filename_end = f"{params.exp_dir}/epoch-{params.epoch}.pt"
logging.info(
f"Calculating the averaged model over epoch range from "
f"{start} (excluded) to {params.epoch}"
)
model.to(device)
model.load_state_dict(
average_checkpoints_with_averaged_model(
filename_start=filename_start,
filename_end=filename_end,
device=device,
)
)
model.to("cpu")
model.eval()
if params.jit:
# We won't use the forward() method of the model in C++, so just ignore
# it here.
# Otherwise, one of its arguments is a ragged tensor and is not
# torch scriptabe.
model.__class__.forward = torch.jit.ignore(model.__class__.forward)
logging.info("Using torch.jit.script")
model = torch.jit.script(model)
filename = (
params.exp_dir / f"cpu_jit-epoch-{params.epoch}-avg-{params.avg}.pt"
)
model.save(str(filename))
logging.info(f"Saved to {filename}")
else:
logging.info("Not using torch.jit.script")
# Save it using a format so that it can be loaded
# by :func:`load_checkpoint`
filename = (
params.exp_dir
/ f"pretrained-epoch-{params.epoch}-avg-{params.avg}.pt"
)
torch.save({"model": model.state_dict()}, str(filename))
logging.info(f"Saved to {filename}")
if __name__ == "__main__":
formatter = (
"%(asctime)s %(levelname)s [%(filename)s:%(lineno)d] %(message)s"
)
logging.basicConfig(format=formatter, level=logging.INFO)
main()

337
egs/aishell/ASR/pruned_transducer_stateless3/pretrained.py Executable file
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@ -0,0 +1,337 @@
#!/usr/bin/env python3
# Copyright 2021 Xiaomi Corp. (authors: Fangjun Kuang,
# Wei Kang)
#
# See ../../../../LICENSE for clarification regarding multiple authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Usage:
(1) greedy search
./pruned_transducer_stateless3/pretrained.py \
--checkpoint /path/to/pretrained.pt \
--lang-dir /path/to/lang_char \
--method greedy_search \
/path/to/foo.wav \
/path/to/bar.wav
(2) beam search
./pruned_transducer_stateless3/pretrained.py \
--checkpoint /path/to/pretrained.pt \
--lang-dir /path/to/lang_char \
--method beam_search \
--beam-size 4 \
/path/to/foo.wav \
/path/to/bar.wav
(3) modified beam search
./pruned_transducer_stateless3/pretrained.py \
--checkpoint /path/to/pretrained.pt \
--lang-dir /path/to/lang_char \
--method modified_beam_search \
--beam-size 4 \
/path/to/foo.wav \
/path/to/bar.wav
(4) fast beam search
./pruned_transducer_stateless3/pretrained.py \
--checkpoint /path/to/pretrained.pt \
--lang-dir /path/to/lang_char \
--method fast_beam_search \
--beam-size 4 \
/path/to/foo.wav \
/path/to/bar.wav
"""
import argparse
import logging
import math
from pathlib import Path
from typing import List
import k2
import kaldifeat
import torch
import torchaudio
from beam_search import (
beam_search,
fast_beam_search_one_best,
greedy_search,
greedy_search_batch,
modified_beam_search,
)
from torch.nn.utils.rnn import pad_sequence
from train import add_model_arguments, get_params, get_transducer_model
from icefall.lexicon import Lexicon
def get_parser():
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter
)
parser.add_argument(
"--checkpoint",
type=str,
required=True,
help="Path to the checkpoint. "
"The checkpoint is assumed to be saved by "
"icefall.checkpoint.save_checkpoint().",
)
parser.add_argument(
"--lang-dir",
type=Path,
default=Path("data/lang_char"),
help="The lang dir",
)
parser.add_argument(
"--method",
type=str,
default="greedy_search",
help="""Possible values are:
- greedy_search
- beam_search
- modified_beam_search
- fast_beam_search
""",
)
parser.add_argument(
"sound_files",
type=str,
nargs="+",
help="The input sound file(s) to transcribe. "
"Supported formats are those supported by torchaudio.load(). "
"For example, wav and flac are supported. "
"The sample rate has to be 16kHz.",
)
parser.add_argument(
"--sample-rate",
type=int,
default=16000,
help="The sample rate of the input sound file",
)
parser.add_argument(
"--beam-size",
type=int,
default=4,
help="""An integer indicating how many candidates we will keep for each
frame. Used only when --method is beam_search or
modified_beam_search.""",
)
parser.add_argument(
"--beam",
type=float,
default=4,
help="""A floating point value to calculate the cutoff score during beam
search (i.e., `cutoff = max-score - beam`), which is the same as the
`beam` in Kaldi.
Used only when --method is fast_beam_search""",
)
parser.add_argument(
"--max-contexts",
type=int,
default=4,
help="""Used only when --method is fast_beam_search""",
)
parser.add_argument(
"--max-states",
type=int,
default=8,
help="""Used only when --method is fast_beam_search""",
)
parser.add_argument(
"--context-size",
type=int,
default=1,
help="The context size in the decoder. 1 means bigram; "
"2 means tri-gram",
)
parser.add_argument(
"--max-sym-per-frame",
type=int,
default=1,
help="Maximum number of symbols per frame. "
"Use only when --method is greedy_search",
)
add_model_arguments(parser)
return parser
def read_sound_files(
filenames: List[str], expected_sample_rate: float
) -> List[torch.Tensor]:
"""Read a list of sound files into a list 1-D float32 torch tensors.
Args:
filenames:
A list of sound filenames.
expected_sample_rate:
The expected sample rate of the sound files.
Returns:
Return a list of 1-D float32 torch tensors.
"""
ans = []
for f in filenames:
wave, sample_rate = torchaudio.load(f)
assert sample_rate == expected_sample_rate, (
f"expected sample rate: {expected_sample_rate}. "
f"Given: {sample_rate}"
)
# We use only the first channel
ans.append(wave[0])
return ans
@torch.no_grad()
def main():
parser = get_parser()
args = parser.parse_args()
params = get_params()
params.update(vars(args))
device = torch.device("cpu")
if torch.cuda.is_available():
device = torch.device("cuda", 0)
logging.info(f"device: {device}")
lexicon = Lexicon(params.lang_dir)
params.blank_id = 0
params.vocab_size = max(lexicon.tokens) + 1
logging.info(params)
logging.info("About to create model")
model = get_transducer_model(params)
checkpoint = torch.load(args.checkpoint, map_location="cpu")
model.load_state_dict(checkpoint["model"], strict=False)
model.to(device)
model.eval()
model.device = device
logging.info("Constructing Fbank computer")
opts = kaldifeat.FbankOptions()
opts.device = device
opts.frame_opts.dither = 0
opts.frame_opts.snip_edges = False
opts.frame_opts.samp_freq = params.sample_rate
opts.mel_opts.num_bins = params.feature_dim
fbank = kaldifeat.Fbank(opts)
logging.info(f"Reading sound files: {params.sound_files}")
waves = read_sound_files(
filenames=params.sound_files, expected_sample_rate=params.sample_rate
)
waves = [w.to(device) for w in waves]
logging.info("Decoding started")
features = fbank(waves)
feature_lens = [f.size(0) for f in features]
feature_lens = torch.tensor(feature_lens, device=device)
features = pad_sequence(
features, batch_first=True, padding_value=math.log(1e-10)
)
encoder_out, encoder_out_lens = model.encoder(
x=features, x_lens=feature_lens
)
num_waves = encoder_out.size(0)
hyp_list = []
logging.info(f"Using {params.method}")
if params.method == "fast_beam_search":
decoding_graph = k2.trivial_graph(params.vocab_size - 1, device=device)
hyp_list = fast_beam_search_one_best(
model=model,
decoding_graph=decoding_graph,
encoder_out=encoder_out,
encoder_out_lens=encoder_out_lens,
beam=params.beam,
max_contexts=params.max_contexts,
max_states=params.max_states,
)
elif params.method == "greedy_search" and params.max_sym_per_frame == 1:
hyp_list = greedy_search_batch(
model=model,
encoder_out=encoder_out,
encoder_out_lens=encoder_out_lens,
)
elif params.method == "modified_beam_search":
hyp_list = modified_beam_search(
model=model,
encoder_out=encoder_out,
encoder_out_lens=encoder_out_lens,
beam=params.beam_size,
)
else:
for i in range(num_waves):
# fmt: off
encoder_out_i = encoder_out[i:i+1, :encoder_out_lens[i]]
# fmt: on
if params.method == "greedy_search":
hyp = greedy_search(
model=model,
encoder_out=encoder_out_i,
max_sym_per_frame=params.max_sym_per_frame,
)
elif params.method == "beam_search":
hyp = beam_search(
model=model,
encoder_out=encoder_out_i,
beam=params.beam_size,
)
else:
raise ValueError(
f"Unsupported decoding method: {params.method}"
)
hyp_list.append(hyp)
hyps = []
for hyp in hyp_list:
hyps.append([lexicon.token_table[i] for i in hyp])
s = "\n"
for filename, hyp in zip(params.sound_files, hyps):
words = " ".join(hyp)
s += f"{filename}:\n{words}\n\n"
logging.info(s)
logging.info("Decoding Done")
if __name__ == "__main__":
formatter = (
"%(asctime)s %(levelname)s [%(filename)s:%(lineno)d] %(message)s"
)
logging.basicConfig(format=formatter, level=logging.INFO)
main()

8
egs/aishell/ASR/pruned_transducer_stateless3/train.py
View File

@ -101,14 +101,14 @@ def add_model_arguments(parser: argparse.ArgumentParser):
parser.add_argument(
"--num-encoder-layers",
type=int,
default=36,
default=12,
help="Number of conformer encoder layers..",
)
parser.add_argument(
"--dim-feedforward",
type=int,
default=1024,
default=2048,
help="Feedforward dimension of the conformer encoder layer.",
)
@ -122,7 +122,7 @@ def add_model_arguments(parser: argparse.ArgumentParser):
parser.add_argument(
"--encoder-dim",
type=int,
default=256,
default=512,
help="Attention dimension in the conformer encoder layer.",
)
@ -1185,7 +1185,7 @@ def scan_pessimistic_batches_for_oom(
graph_compiler=graph_compiler,
batch=batch,
is_training=True,
warmup=0.0,
warmup=0.0 if params.start_epoch == 1 else 1.0,
)
loss.backward()
optimizer.step()

3
egs/librispeech/ASR/pruned_transducer_stateless2/decoder.py
View File

@ -73,6 +73,9 @@ class Decoder(nn.Module):
groups=decoder_dim,
bias=False,
)
else:
# It is to support torch script
self.conv = nn.Identity()
def forward(self, y: torch.Tensor, need_pad: bool = True) -> torch.Tensor:
"""

39
egs/librispeech/ASR/pruned_transducer_stateless5/conformer.py
View File

@ -117,10 +117,7 @@ class Conformer(EncoderInterface):
x, pos_emb = self.encoder_pos(x)
x = x.permute(1, 0, 2) # (N, T, C) -> (T, N, C)
with warnings.catch_warnings():
warnings.simplefilter("ignore")
# Caution: We assume the subsampling factor is 4!
lengths = ((x_lens - 1) // 2 - 1) // 2
lengths = (((x_lens - 1) >> 1) - 1) >> 1
assert x.size(0) == lengths.max().item()
mask = make_pad_mask(lengths)
@ -293,8 +290,10 @@ class ConformerEncoder(nn.Module):
)
self.num_layers = num_layers
assert len(set(aux_layers)) == len(aux_layers)
assert num_layers - 1 not in aux_layers
self.aux_layers = set(aux_layers + [num_layers - 1])
self.aux_layers = aux_layers + [num_layers - 1]
num_channels = encoder_layer.norm_final.num_channels
self.combiner = RandomCombine(
@ -1154,7 +1153,7 @@ class RandomCombine(nn.Module):
"""
num_inputs = self.num_inputs
assert len(inputs) == num_inputs
if not self.training:
if not self.training or torch.jit.is_scripting():
return inputs[-1]
# Shape of weights: (*, num_inputs)
@ -1162,8 +1161,22 @@ class RandomCombine(nn.Module):
num_frames = inputs[0].numel() // num_channels
mod_inputs = []
for i in range(num_inputs - 1):
mod_inputs.append(self.linear[i](inputs[i]))
if False:
# It throws the following error for torch 1.6.0 when using
# torch script.
#
# Expected integer literal for index. ModuleList/Sequential
# indexing is only supported with integer literals. Enumeration is
# supported, e.g. 'for index, v in enumerate(self): ...':
# for i in range(num_inputs - 1):
# mod_inputs.append(self.linear[i](inputs[i]))
assert False
else:
for i, linear in enumerate(self.linear):
if i < num_inputs - 1:
mod_inputs.append(linear(inputs[i]))
mod_inputs.append(inputs[num_inputs - 1])
ndim = inputs[0].ndim
@ -1181,11 +1194,13 @@ class RandomCombine(nn.Module):
# ans: (num_frames, num_channels, 1)
ans = torch.matmul(stacked_inputs, weights)
# ans: (*, num_channels)
ans = ans.reshape(*tuple(inputs[0].shape[:-1]), num_channels)
if __name__ == "__main__":
# for testing only...
print("Weights = ", weights.reshape(num_frames, num_inputs))
ans = ans.reshape(inputs[0].shape[:-1] + [num_channels])
# The following if causes errors for torch script in torch 1.6.0
# if __name__ == "__main__":
# # for testing only...
# print("Weights = ", weights.reshape(num_frames, num_inputs))
return ans
def _get_random_weights(

9
egs/librispeech/ASR/pruned_transducer_stateless5/export.py
View File

@ -146,8 +146,6 @@ def main():
args = get_parser().parse_args()
args.exp_dir = Path(args.exp_dir)
assert args.jit is False, "Support torchscript will be added later"
params = get_params()
params.update(vars(args))
@ -246,12 +244,15 @@ def main():
)
)
model.eval()
model.to("cpu")
model.eval()
if params.jit:
# We won't use the forward() method of the model in C++, so just ignore
# it here.
# Otherwise, one of its arguments is a ragged tensor and is not
# torch scriptabe.
model.__class__.forward = torch.jit.ignore(model.__class__.forward)
logging.info("Using torch.jit.script")
model = torch.jit.script(model)
filename = params.exp_dir / "cpu_jit.pt"