mirror of
https://github.com/k2-fsa/icefall.git
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690 lines
22 KiB
Python
Executable File
690 lines
22 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright 2021 Xiaomi Corporation (Author: Fangjun Kuang)
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# Copyright 2022 Xiaomi Corporation (Author: 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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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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When training with the L subset, usage:
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(1) greedy search
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./pruned_transducer_stateless2/decode.py \
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--epoch 10 \
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--avg 2 \
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--exp-dir ./pruned_transducer_stateless2/exp \
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--lang-dir data/lang_char \
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--max-duration 100 \
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--decoding-method greedy_search
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(2) modified beam search
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./pruned_transducer_stateless2/decode.py \
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--epoch 10 \
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--avg 2 \
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--exp-dir ./pruned_transducer_stateless2/exp \
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--lang-dir data/lang_char \
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--max-duration 100 \
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--decoding-method modified_beam_search \
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--beam-size 4
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(3) fast beam search (1best)
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./pruned_transducer_stateless2/decode.py \
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--epoch 10 \
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--avg 2 \
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--exp-dir ./pruned_transducer_stateless2/exp \
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--lang-dir data/lang_char \
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--max-duration 1500 \
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--decoding-method fast_beam_search \
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--beam 4 \
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--max-contexts 4 \
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--max-states 8
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(4) fast beam search (nbest)
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./pruned_transducer_stateless2/decode.py \
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--epoch 10 \
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--avg 2 \
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--exp-dir ./pruned_transducer_stateless2/exp \
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--lang-dir data/lang_char \
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--max-duration 600 \
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--decoding-method fast_beam_search_nbest \
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--beam 20.0 \
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--max-contexts 8 \
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--max-states 64 \
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--num-paths 200 \
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--nbest-scale 0.5
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(5) fast beam search (nbest oracle WER)
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./pruned_transducer_stateless2/decode.py \
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--epoch 10 \
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--avg 2 \
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--exp-dir ./pruned_transducer_stateless2/exp \
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--lang-dir data/lang_char \
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--max-duration 600 \
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--decoding-method fast_beam_search_nbest_oracle \
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--beam 20.0 \
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--max-contexts 8 \
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--max-states 64 \
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--num-paths 200 \
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--nbest-scale 0.5
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(6) fast beam search (with LG)
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./pruned_transducer_stateless2/decode.py \
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--epoch 10 \
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--avg 2 \
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--exp-dir ./pruned_transducer_stateless2/exp \
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--lang-dir data/lang_char \
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--max-duration 600 \
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--decoding-method fast_beam_search_nbest_LG \
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--beam 20.0 \
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--max-contexts 8 \
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--max-states 64
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"""
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import argparse
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import logging
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from collections import defaultdict
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from pathlib import Path
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from typing import Dict, List, Optional, Tuple
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import k2
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import torch
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import torch.nn as nn
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from asr_datamodule import WenetSpeechAsrDataModule
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from beam_search import (
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beam_search,
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fast_beam_search_nbest,
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fast_beam_search_nbest_LG,
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fast_beam_search_nbest_oracle,
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fast_beam_search_one_best,
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greedy_search,
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greedy_search_batch,
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modified_beam_search,
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)
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from train import get_params, get_transducer_model
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from icefall.char_graph_compiler import CharCtcTrainingGraphCompiler
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from icefall.checkpoint import average_checkpoints, find_checkpoints, load_checkpoint
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from icefall.lexicon import Lexicon
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from icefall.utils import (
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AttributeDict,
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setup_logger,
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store_transcripts,
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write_error_stats,
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)
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def get_parser():
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parser = argparse.ArgumentParser(
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formatter_class=argparse.ArgumentDefaultsHelpFormatter
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)
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parser.add_argument(
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"--epoch",
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type=int,
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default=28,
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help="It specifies the checkpoint to use for decoding."
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"Note: Epoch counts from 0.",
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)
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parser.add_argument(
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"--batch",
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type=int,
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default=None,
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help="It specifies the batch checkpoint to use for decoding."
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"Note: Epoch counts from 0.",
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)
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parser.add_argument(
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"--avg",
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type=int,
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default=15,
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help="Number of checkpoints to average. Automatically select "
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"consecutive checkpoints before the checkpoint specified by "
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"'--epoch'. ",
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)
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parser.add_argument(
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"--avg-last-n",
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type=int,
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default=0,
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help="""If positive, --epoch and --avg are ignored and it
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will use the last n checkpoints exp_dir/checkpoint-xxx.pt
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where xxx is the number of processed batches while
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saving that checkpoint.
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""",
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)
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parser.add_argument(
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"--exp-dir",
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type=str,
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default="pruned_transducer_stateless2/exp",
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help="The experiment dir",
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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="data/lang_char",
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help="""The lang dir
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It contains language related input files such as
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"lexicon.txt"
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""",
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)
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parser.add_argument(
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"--decoding-method",
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type=str,
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default="greedy_search",
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help="""Possible values are:
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- greedy_search
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- beam_search
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- modified_beam_search
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- fast_beam_search
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- fast_beam_search_nbest
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- fast_beam_search_nbest_oracle
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- fast_beam_search_nbest_LG
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If you use fast_beam_search_nbest_LG, you have to
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specify `--lang-dir`, which should contain `LG.pt`.
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""",
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)
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parser.add_argument(
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"--beam-size",
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type=int,
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default=4,
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help="""An integer indicating how many candidates we will keep for each
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frame. Used only when --decoding-method is beam_search or
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modified_beam_search.""",
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)
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parser.add_argument(
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"--beam",
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type=float,
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default=4,
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help="""A floating point value to calculate the cutoff score during beam
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search (i.e., `cutoff = max-score - beam`), which is the same as the
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`beam` in Kaldi.
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Used only when --decoding-method is fast_beam_search""",
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)
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parser.add_argument(
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"--ngram-lm-scale",
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type=float,
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default=0.35,
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help="""
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Used only when --decoding_method is fast_beam_search_nbest_LG.
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It specifies the scale for n-gram LM scores.
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""",
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)
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parser.add_argument(
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"--max-contexts",
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type=int,
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default=4,
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help="""Used only when --decoding-method is
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fast_beam_search""",
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)
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parser.add_argument(
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"--max-states",
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type=int,
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default=8,
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help="""Used only when --decoding-method is
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fast_beam_search""",
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)
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parser.add_argument(
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"--context-size",
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type=int,
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default=2,
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help="The context size in the decoder. 1 means bigram; 2 means tri-gram",
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)
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parser.add_argument(
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"--max-sym-per-frame",
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type=int,
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default=1,
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help="""Maximum number of symbols per frame.
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Used only when --decoding_method is greedy_search""",
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)
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parser.add_argument(
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"--num-paths",
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type=int,
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default=200,
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help="""Number of paths for nbest decoding.
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Used only when the decoding method is fast_beam_search_nbest,
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fast_beam_search_nbest_LG, and fast_beam_search_nbest_oracle""",
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)
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parser.add_argument(
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"--nbest-scale",
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type=float,
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default=0.5,
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help="""Scale applied to lattice scores when computing nbest paths.
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Used only when the decoding method is fast_beam_search_nbest,
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fast_beam_search_nbest_LG, and fast_beam_search_nbest_oracle""",
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)
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return parser
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def decode_one_batch(
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params: AttributeDict,
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model: nn.Module,
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lexicon: Lexicon,
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graph_compiler: CharCtcTrainingGraphCompiler,
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batch: dict,
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decoding_graph: Optional[k2.Fsa] = None,
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) -> Dict[str, List[List[str]]]:
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"""Decode one batch and return the result in a dict. The dict has the
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following format:
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- key: It indicates the setting used for decoding. For example,
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if greedy_search is used, it would be "greedy_search"
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If beam search with a beam size of 7 is used, it would be
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"beam_7"
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- value: It contains the decoding result. `len(value)` equals to
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batch size. `value[i]` is the decoding result for the i-th
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utterance in the given batch.
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Args:
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params:
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It's the return value of :func:`get_params`.
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model:
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The neural model.
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batch:
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It is the return value from iterating
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`lhotse.dataset.K2SpeechRecognitionDataset`. See its documentation
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for the format of the `batch`.
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decoding_graph:
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The decoding graph. Can be either a `k2.trivial_graph` or HLG, Used
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only when --decoding_method is fast_beam_search.
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Returns:
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Return the decoding result. See above description for the format of
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the returned dict.
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"""
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device = model.device
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feature = batch["inputs"]
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assert feature.ndim == 3
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feature = feature.to(device)
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# at entry, feature is (N, T, C)
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supervisions = batch["supervisions"]
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feature_lens = supervisions["num_frames"].to(device)
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encoder_out, encoder_out_lens = model.encoder(x=feature, x_lens=feature_lens)
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hyps = []
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if params.decoding_method == "fast_beam_search":
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hyp_tokens = fast_beam_search_one_best(
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model=model,
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decoding_graph=decoding_graph,
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encoder_out=encoder_out,
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encoder_out_lens=encoder_out_lens,
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beam=params.beam,
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max_contexts=params.max_contexts,
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max_states=params.max_states,
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)
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for i in range(encoder_out.size(0)):
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hyps.append([lexicon.token_table[idx] for idx in hyp_tokens[i]])
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elif params.decoding_method == "fast_beam_search_nbest_LG":
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hyp_tokens = fast_beam_search_nbest_LG(
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model=model,
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decoding_graph=decoding_graph,
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encoder_out=encoder_out,
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encoder_out_lens=encoder_out_lens,
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beam=params.beam,
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max_contexts=params.max_contexts,
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max_states=params.max_states,
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num_paths=params.num_paths,
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nbest_scale=params.nbest_scale,
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)
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for hyp in hyp_tokens:
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sentence = "".join([lexicon.word_table[i] for i in hyp])
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hyps.append(list(sentence))
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elif params.decoding_method == "fast_beam_search_nbest":
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hyp_tokens = fast_beam_search_nbest(
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model=model,
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decoding_graph=decoding_graph,
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encoder_out=encoder_out,
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encoder_out_lens=encoder_out_lens,
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beam=params.beam,
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max_contexts=params.max_contexts,
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max_states=params.max_states,
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num_paths=params.num_paths,
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nbest_scale=params.nbest_scale,
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)
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for i in range(encoder_out.size(0)):
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hyps.append([lexicon.token_table[idx] for idx in hyp_tokens[i]])
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elif params.decoding_method == "fast_beam_search_nbest_oracle":
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hyp_tokens = fast_beam_search_nbest_oracle(
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model=model,
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decoding_graph=decoding_graph,
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encoder_out=encoder_out,
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encoder_out_lens=encoder_out_lens,
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beam=params.beam,
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max_contexts=params.max_contexts,
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max_states=params.max_states,
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num_paths=params.num_paths,
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ref_texts=graph_compiler.texts_to_ids(supervisions["text"]),
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nbest_scale=params.nbest_scale,
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)
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for i in range(encoder_out.size(0)):
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hyps.append([lexicon.token_table[idx] for idx in hyp_tokens[i]])
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elif params.decoding_method == "greedy_search" and params.max_sym_per_frame == 1:
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hyp_tokens = greedy_search_batch(
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model=model,
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encoder_out=encoder_out,
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encoder_out_lens=encoder_out_lens,
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)
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for i in range(encoder_out.size(0)):
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hyps.append([lexicon.token_table[idx] for idx in hyp_tokens[i]])
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elif params.decoding_method == "modified_beam_search":
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hyp_tokens = modified_beam_search(
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model=model,
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encoder_out=encoder_out,
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beam=params.beam_size,
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encoder_out_lens=encoder_out_lens,
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)
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for i in range(encoder_out.size(0)):
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hyps.append([lexicon.token_table[idx] for idx in hyp_tokens[i]])
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else:
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batch_size = encoder_out.size(0)
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for i in range(batch_size):
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# fmt: off
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encoder_out_i = encoder_out[i:i+1, :encoder_out_lens[i]]
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# fmt: on
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if params.decoding_method == "greedy_search":
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hyp = greedy_search(
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model=model,
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encoder_out=encoder_out_i,
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max_sym_per_frame=params.max_sym_per_frame,
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)
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elif params.decoding_method == "beam_search":
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hyp = beam_search(
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model=model,
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encoder_out=encoder_out_i,
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beam=params.beam_size,
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)
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else:
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raise ValueError(
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f"Unsupported decoding method: {params.decoding_method}"
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)
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hyps.append([lexicon.token_table[idx] for idx in hyp])
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if params.decoding_method == "greedy_search":
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return {"greedy_search": hyps}
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elif params.decoding_method == "fast_beam_search":
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return {
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(
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f"beam_{params.beam}_"
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f"max_contexts_{params.max_contexts}_"
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f"max_states_{params.max_states}"
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): hyps
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}
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else:
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return {f"beam_size_{params.beam_size}": hyps}
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def decode_dataset(
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dl: torch.utils.data.DataLoader,
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params: AttributeDict,
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model: nn.Module,
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lexicon: Lexicon,
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graph_compiler: CharCtcTrainingGraphCompiler,
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decoding_graph: Optional[k2.Fsa] = None,
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) -> Dict[str, List[Tuple[str, List[str], List[str]]]]:
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"""Decode dataset.
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Args:
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dl:
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PyTorch's dataloader containing the dataset to decode.
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params:
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It is returned by :func:`get_params`.
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model:
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The neural model.
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decoding_graph:
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The decoding graph. Can be either a `k2.trivial_graph` or HLG, Used
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only when --decoding_method is fast_beam_search.
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Returns:
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Return a dict, whose key may be "greedy_search" if greedy search
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is used, or it may be "beam_7" if beam size of 7 is used.
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Its value is a list of tuples. Each tuple contains two elements:
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The first is the reference transcript, and the second is the
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predicted result.
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"""
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num_cuts = 0
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try:
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num_batches = len(dl)
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except TypeError:
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num_batches = "?"
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if params.decoding_method == "greedy_search":
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log_interval = 100
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else:
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log_interval = 2
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results = defaultdict(list)
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for batch_idx, batch in enumerate(dl):
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texts = batch["supervisions"]["text"]
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texts = [list(str(text)) for text in texts]
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cut_ids = [cut.id for cut in batch["supervisions"]["cut"]]
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hyps_dict = decode_one_batch(
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params=params,
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model=model,
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lexicon=lexicon,
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graph_compiler=graph_compiler,
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decoding_graph=decoding_graph,
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batch=batch,
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)
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for name, hyps in hyps_dict.items():
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this_batch = []
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assert len(hyps) == len(texts)
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for cut_id, hyp_words, ref_text in zip(cut_ids, hyps, texts):
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this_batch.append((cut_id, ref_text, hyp_words))
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results[name].extend(this_batch)
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num_cuts += len(texts)
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if batch_idx % log_interval == 0:
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batch_str = f"{batch_idx}/{num_batches}"
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logging.info(f"batch {batch_str}, cuts processed until now is {num_cuts}")
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return results
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def save_results(
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params: AttributeDict,
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test_set_name: str,
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results_dict: Dict[str, List[Tuple[str, List[str], List[str]]]],
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):
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test_set_wers = dict()
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for key, results in results_dict.items():
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recog_path = params.res_dir / f"recogs-{test_set_name}-{params.suffix}.txt"
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results = sorted(results)
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store_transcripts(filename=recog_path, texts=results)
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|
logging.info(f"The transcripts are stored in {recog_path}")
|
|
|
|
# The following prints out WERs, per-word error statistics and aligned
|
|
# ref/hyp pairs.
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|
errs_filename = params.res_dir / f"errs-{test_set_name}-{params.suffix}.txt"
|
|
with open(errs_filename, "w") as f:
|
|
wer = write_error_stats(
|
|
f, f"{test_set_name}-{key}", results, enable_log=True
|
|
)
|
|
test_set_wers[key] = wer
|
|
|
|
logging.info("Wrote detailed error stats to {}".format(errs_filename))
|
|
|
|
test_set_wers = sorted(test_set_wers.items(), key=lambda x: x[1])
|
|
errs_info = params.res_dir / f"wer-summary-{test_set_name}-{params.suffix}.txt"
|
|
with open(errs_info, "w") as f:
|
|
print("settings\tWER", file=f)
|
|
for key, val in test_set_wers:
|
|
print("{}\t{}".format(key, val), file=f)
|
|
|
|
s = "\nFor {}, WER of different settings are:\n".format(test_set_name)
|
|
note = "\tbest for {}".format(test_set_name)
|
|
for key, val in test_set_wers:
|
|
s += "{}\t{}{}\n".format(key, val, note)
|
|
note = ""
|
|
logging.info(s)
|
|
|
|
|
|
@torch.no_grad()
|
|
def main():
|
|
parser = get_parser()
|
|
WenetSpeechAsrDataModule.add_arguments(parser)
|
|
args = parser.parse_args()
|
|
args.exp_dir = Path(args.exp_dir)
|
|
|
|
params = get_params()
|
|
params.update(vars(args))
|
|
|
|
assert params.decoding_method in (
|
|
"greedy_search",
|
|
"beam_search",
|
|
"fast_beam_search",
|
|
"fast_beam_search_nbest",
|
|
"fast_beam_search_nbest_LG",
|
|
"fast_beam_search_nbest_oracle",
|
|
"modified_beam_search",
|
|
)
|
|
params.res_dir = params.exp_dir / params.decoding_method
|
|
|
|
params.suffix = f"epoch-{params.epoch}-avg-{params.avg}"
|
|
if "fast_beam_search" in params.decoding_method:
|
|
params.suffix += f"-beam-{params.beam}"
|
|
params.suffix += f"-max-contexts-{params.max_contexts}"
|
|
params.suffix += f"-max-states-{params.max_states}"
|
|
if params.decoding_method == "fast_beam_search_nbest_LG":
|
|
params.suffix += f"-ngram-lm-scale-{params.ngram_lm_scale}"
|
|
if (
|
|
params.decoding_method == "fast_beam_search_nbest"
|
|
or params.decoding_method == "fast_beam_search_nbest_oracle"
|
|
):
|
|
params.suffix += f"-nbest-scale-{params.nbest_scale}"
|
|
elif "beam_search" in params.decoding_method:
|
|
params.suffix += f"-beam-{params.beam_size}"
|
|
else:
|
|
params.suffix += f"-context-{params.context_size}"
|
|
params.suffix += f"-max-sym-per-frame-{params.max_sym_per_frame}"
|
|
|
|
setup_logger(f"{params.res_dir}/log-decode-{params.suffix}")
|
|
logging.info("Decoding started")
|
|
|
|
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 = lexicon.token_table["<blk>"]
|
|
params.vocab_size = max(lexicon.tokens) + 1
|
|
|
|
graph_compiler = CharCtcTrainingGraphCompiler(
|
|
lexicon=lexicon,
|
|
device=device,
|
|
)
|
|
|
|
logging.info(params)
|
|
|
|
logging.info("About to create model")
|
|
model = get_transducer_model(params)
|
|
|
|
if params.avg_last_n > 0:
|
|
filenames = find_checkpoints(params.exp_dir)[: params.avg_last_n]
|
|
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)
|
|
elif params.batch is not None:
|
|
filenames = f"{params.exp_dir}/checkpoint-{params.batch}.pt"
|
|
logging.info(f"averaging {filenames}")
|
|
model.to(device)
|
|
model.load_state_dict(average_checkpoints([filenames], device=device))
|
|
else:
|
|
start = params.epoch - params.avg + 1
|
|
filenames = []
|
|
for i in range(start, params.epoch + 1):
|
|
if start >= 0:
|
|
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))
|
|
|
|
model.to(device)
|
|
model.eval()
|
|
model.device = device
|
|
|
|
if "fast_beam_search" in params.decoding_method:
|
|
if params.decoding_method == "fast_beam_search_nbest_LG":
|
|
lg_filename = params.lang_dir + "/LG.pt"
|
|
logging.info(f"Loading {lg_filename}")
|
|
decoding_graph = k2.Fsa.from_dict(
|
|
torch.load(lg_filename, map_location=device)
|
|
)
|
|
decoding_graph.scores *= params.ngram_lm_scale
|
|
else:
|
|
decoding_graph = k2.trivial_graph(params.vocab_size - 1, device=device)
|
|
else:
|
|
decoding_graph = None
|
|
|
|
num_param = sum([p.numel() for p in model.parameters()])
|
|
logging.info(f"Number of model parameters: {num_param}")
|
|
|
|
# we need cut ids to display recognition results.
|
|
args.return_cuts = True
|
|
wenetspeech = WenetSpeechAsrDataModule(args)
|
|
|
|
dev_cuts = wenetspeech.valid_cuts()
|
|
dev_dl = wenetspeech.valid_dataloaders(dev_cuts)
|
|
|
|
test_net_cuts = wenetspeech.test_net_cuts()
|
|
test_net_dl = wenetspeech.test_dataloaders(test_net_cuts)
|
|
|
|
test_meeting_cuts = wenetspeech.test_meeting_cuts()
|
|
test_meeting_dl = wenetspeech.test_dataloaders(test_meeting_cuts)
|
|
|
|
test_sets = ["DEV", "TEST_NET", "TEST_MEETING"]
|
|
test_dl = [dev_dl, test_net_dl, test_meeting_dl]
|
|
|
|
for test_set, test_dl in zip(test_sets, test_dl):
|
|
results_dict = decode_dataset(
|
|
dl=test_dl,
|
|
params=params,
|
|
model=model,
|
|
lexicon=lexicon,
|
|
graph_compiler=graph_compiler,
|
|
decoding_graph=decoding_graph,
|
|
)
|
|
save_results(
|
|
params=params,
|
|
test_set_name=test_set,
|
|
results_dict=results_dict,
|
|
)
|
|
|
|
logging.info("Done!")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|