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Add ctc-decoding to pretrained.py
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Mingshuang Luo
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d54828e73a
commit
6bc027ee8a
@ -528,10 +528,56 @@ displays the help information.
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It supports three decoding methods:
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- CTC decoding
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- HLG decoding
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- HLG + n-gram LM rescoring
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- HLG + n-gram LM rescoring + attention decoder rescoring
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CTC decoding
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^^^^^^^^^^^^
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CTC decoding uses the best path of the decoding lattice as the decoding result
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without any LM or lexicon.
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The command to run CTC decoding is:
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.. code-block:: bash
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$ cd egs/librispeech/ASR
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$ ./conformer_ctc/pretrained.py \
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--checkpoint ./tmp/icefall_asr_librispeech_conformer_ctc/exp/pretrained.pt \
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--lang-dir ./tmp/icefall_asr_librispeech_conformer_ctc/data/lang_bpe \
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./tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1089-134686-0001.flac \
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./tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1221-135766-0001.flac \
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./tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1221-135766-0002.flac
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The output is given below:
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.. code-block::
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2021-10-09 21:06:57,154 INFO [pretrained.py:253] device: cuda:0
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2021-10-09 21:06:57,154 INFO [pretrained.py:255] Creating model
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2021-10-09 21:07:04,234 INFO [pretrained.py:272] Constructing Fbank computer
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2021-10-09 21:07:04,235 INFO [pretrained.py:282] Reading sound files: ['./tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1089-134686-0001.flac', './tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1221-135766-0001.flac', './tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1221-135766-0002.flac']
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2021-10-09 21:07:04,248 INFO [pretrained.py:288] Decoding started
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2021-10-09 21:07:05,041 INFO [pretrained.py:306] Building CTC topology
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2021-10-09 21:07:05,334 INFO [lexicon.py:113] Loading pre-compiled tmp/icefall_asr_librispeech_conformer_ctc/data/lang_bpe/Linv.pt
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2021-10-09 21:07:05,380 INFO [pretrained.py:315] Loading BPE model
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2021-10-09 21:07:07,905 INFO [pretrained.py:330] Use CTC decoding
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2021-10-09 21:07:07,918 INFO [pretrained.py:407]
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./tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1089-134686-0001.flac:
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AFTER EARLY NIGHTFALL THE YELLOW LAMPS WOULD LIGHT UP HERE AND THERE THE SQUALID QUARTER OF THE BROTHELS
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./tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1221-135766-0001.flac:
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GOD AS A DIRECT CONSEQUENCE OF THE SIN WHICH MAN THUS PUNISHED HAD GIVEN HER A LOVELY CHILD WHOSE PLACE WAS ON THAT SAME DISHONOURED
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BOSOM TO CONNECT HER PARENT FOR EVER WITH THE RACE AND DESCENT OF MORTALS AND TO BE FINALLY A BLESSED SOUL IN HEAVEN
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./tmp/icefall_asr_librispeech_conformer_ctc/test_wavs/1221-135766-0002.flac:
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YET THESE THOUGHTS AFFECTED HESTER PRYNNE LESS WITH HOPE THAN APPREHENSION
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2021-10-09 21:07:07,918 INFO [pretrained.py:409] Decoding Done
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HLG decoding
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^^^^^^^^^^^^
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@ -1,5 +1,6 @@
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#!/usr/bin/env python3
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# Copyright 2021 Xiaomi Corp. (authors: Fangjun Kuang)
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# Copyright 2021 Xiaomi Corp. (authors: Fangjun Kuang,
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# Mingshuang Luo)
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#
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# See ../../../../LICENSE for clarification regarding multiple authors
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#
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@ -19,6 +20,7 @@
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import argparse
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import logging
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import math
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import sentencepiece as spm
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from typing import List
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import k2
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@ -28,6 +30,7 @@ import torchaudio
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from conformer import Conformer
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from torch.nn.utils.rnn import pad_sequence
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from icefall.lexicon import Lexicon
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from icefall.decode import (
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get_lattice,
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one_best_decoding,
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@ -54,12 +57,17 @@ def get_parser():
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parser.add_argument(
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"--words-file",
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type=str,
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required=True,
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default="./tmp/icefall_asr_librispeech_conformer_ctc/ \
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data/lang_bpe/words.txt",
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help="Path to words.txt",
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)
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parser.add_argument(
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"--HLG", type=str, required=True, help="Path to HLG.pt."
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"--HLG",
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type=str,
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default="./tmp/icefall_asr_librispeech_conformer_ctc/ \
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data/lang_bpe/HLG.pt",
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help="Path to HLG.pt.",
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)
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parser.add_argument(
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@ -68,6 +76,10 @@ def get_parser():
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default="1best",
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help="""Decoding method.
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Possible values are:
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(0) ctc-decoding - Use CTC decoding. It uses a sentence
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piece model, i.e., lang_dir/bpe.model, to convert
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word pieces to words. It needs neither a lexicon
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nor an n-gram LM.
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(1) 1best - Use the best path as decoding output. Only
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the transformer encoder output is used for decoding.
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We call it HLG decoding.
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@ -157,6 +169,14 @@ def get_parser():
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""",
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)
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parser.add_argument(
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"--lang-dir",
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type=str,
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default="./tmp/icefall_asr_librispeech_conformer_ctc/ \
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data/lang_bpe",
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help="Path to lang bpe dir.",
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)
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parser.add_argument(
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"sound_files",
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type=str,
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@ -249,23 +269,6 @@ def main():
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model.to(device)
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model.eval()
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logging.info(f"Loading HLG from {params.HLG}")
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HLG = k2.Fsa.from_dict(torch.load(params.HLG, map_location="cpu"))
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HLG = HLG.to(device)
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if not hasattr(HLG, "lm_scores"):
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# For whole-lattice-rescoring and attention-decoder
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HLG.lm_scores = HLG.scores.clone()
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if params.method in ["whole-lattice-rescoring", "attention-decoder"]:
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logging.info(f"Loading G from {params.G}")
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G = k2.Fsa.from_dict(torch.load(params.G, map_location="cpu"))
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# Add epsilon self-loops to G as we will compose
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# it with the whole lattice later
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G = G.to(device)
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G = k2.add_epsilon_self_loops(G)
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G = k2.arc_sort(G)
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G.lm_scores = G.scores.clone()
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logging.info("Constructing Fbank computer")
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opts = kaldifeat.FbankOptions()
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opts.device = device
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@ -299,6 +302,57 @@ def main():
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dtype=torch.int32,
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)
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if params.method == "ctc-decoding":
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logging.info("Building CTC topology")
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lexicon = Lexicon(params.lang_dir)
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max_token_id = max(lexicon.tokens)
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H = k2.ctc_topo(
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max_token=max_token_id,
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modified=False,
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device=device,
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)
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logging.info("Loading BPE model")
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bpe_model = spm.SentencePieceProcessor()
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bpe_model.load(str(params.lang_dir + "/bpe.model"))
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lattice = get_lattice(
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nnet_output=nnet_output,
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decoding_graph=H,
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supervision_segments=supervision_segments,
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search_beam=params.search_beam,
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output_beam=params.output_beam,
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min_active_states=params.min_active_states,
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max_active_states=params.max_active_states,
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subsampling_factor=params.subsampling_factor,
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)
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logging.info("Use CTC decoding")
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best_path = one_best_decoding(
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lattice=lattice, use_double_scores=params.use_double_scores
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)
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token_ids = get_texts(best_path)
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hyps = bpe_model.decode(token_ids)
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hyps = [s.split() for s in hyps]
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else:
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logging.info(f"Loading HLG from {params.HLG}")
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HLG = k2.Fsa.from_dict(torch.load(params.HLG, map_location="cpu"))
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HLG = HLG.to(device)
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if not hasattr(HLG, "lm_scores"):
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# For whole-lattice-rescoring and attention-decoder
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HLG.lm_scores = HLG.scores.clone()
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if params.method in ["whole-lattice-rescoring", "attention-decoder"]:
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logging.info(f"Loading G from {params.G}")
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G = k2.Fsa.from_dict(torch.load(params.G, map_location="cpu"))
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# Add epsilon self-loops to G as we will compose
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# it with the whole lattice later
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G = G.to(device)
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G = k2.add_epsilon_self_loops(G)
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G = k2.arc_sort(G)
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G.lm_scores = G.scores.clone()
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lattice = get_lattice(
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nnet_output=nnet_output,
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decoding_graph=HLG,
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