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use 3gram to decode, 4gram to rescore
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Guanbo Wang
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#!/usr/bin/env python3
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# Copyright 2021 Xiaomi Corp. (authors: Fangjun Kuang)
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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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This script takes as input lang_dir and generates HLG from
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- H, the ctc topology, built from tokens contained in lang_dir/lexicon.txt
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- L, the lexicon, built from lang_dir/L_disambig.pt
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Caution: We use a lexicon that contains disambiguation symbols
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- G, the LM, built from data/lm/G_4_gram.fst.txt
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The generated HLG is saved in $lang_dir/HLG.pt
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"""
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import argparse
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import logging
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from pathlib import Path
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import k2
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import torch
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from icefall.lexicon import Lexicon
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def get_args():
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parser = argparse.ArgumentParser()
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parser.add_argument(
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"--lang-dir",
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type=str,
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help="""Input and output directory.
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""",
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)
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return parser.parse_args()
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def compile_HLG(lang_dir: str) -> k2.Fsa:
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"""
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Args:
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lang_dir:
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The language directory, e.g., data/lang_phone or data/lang_bpe_5000.
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Return:
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An FSA representing HLG.
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"""
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lexicon = Lexicon(lang_dir)
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max_token_id = max(lexicon.tokens)
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logging.info(f"Building ctc_topo. max_token_id: {max_token_id}")
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H = k2.ctc_topo(max_token_id)
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L = k2.Fsa.from_dict(torch.load(f"{lang_dir}/L_disambig.pt"))
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if Path("data/lm/G_4_gram.pt").is_file():
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logging.info("Loading pre-compiled G_4_gram")
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d = torch.load("data/lm/G_4_gram.pt")
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G = k2.Fsa.from_dict(d)
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else:
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logging.info("Loading G_4_gram.fst.txt")
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with open("data/lm/G_4_gram.fst.txt") as f:
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G = k2.Fsa.from_openfst(f.read(), acceptor=False)
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torch.save(G.as_dict(), "data/lm/G_4_gram.pt")
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first_token_disambig_id = lexicon.token_table["#0"]
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first_word_disambig_id = lexicon.word_table["#0"]
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L = k2.arc_sort(L)
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G = k2.arc_sort(G)
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logging.info("Intersecting L and G")
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LG = k2.compose(L, G)
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logging.info(f"LG shape: {LG.shape}")
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logging.info("Connecting LG")
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LG = k2.connect(LG)
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logging.info(f"LG shape after k2.connect: {LG.shape}")
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logging.info(type(LG.aux_labels))
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logging.info("Determinizing LG")
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LG = k2.determinize(LG)
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logging.info(type(LG.aux_labels))
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logging.info("Connecting LG after k2.determinize")
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LG = k2.connect(LG)
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logging.info("Removing disambiguation symbols on LG")
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LG.labels[LG.labels >= first_token_disambig_id] = 0
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# See https://github.com/k2-fsa/k2/issues/874
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# for why we need to set LG.properties to None
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LG.__dict__["_properties"] = None
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assert isinstance(LG.aux_labels, k2.RaggedTensor)
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LG.aux_labels.values[LG.aux_labels.values >= first_word_disambig_id] = 0
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LG = k2.remove_epsilon(LG)
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logging.info(f"LG shape after k2.remove_epsilon: {LG.shape}")
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LG = k2.connect(LG)
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LG.aux_labels = LG.aux_labels.remove_values_eq(0)
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logging.info("Arc sorting LG")
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LG = k2.arc_sort(LG)
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logging.info("Composing H and LG")
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# CAUTION: The name of the inner_labels is fixed
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# to `tokens`. If you want to change it, please
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# also change other places in icefall that are using
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# it.
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HLG = k2.compose(H, LG, inner_labels="tokens")
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logging.info("Connecting LG")
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HLG = k2.connect(HLG)
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logging.info("Arc sorting LG")
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HLG = k2.arc_sort(HLG)
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logging.info(f"HLG.shape: {HLG.shape}")
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return HLG
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def main():
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args = get_args()
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lang_dir = Path(args.lang_dir)
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if (lang_dir / "HLG.pt").is_file():
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logging.info(f"{lang_dir}/HLG.pt already exists - skipping")
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return
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logging.info(f"Processing {lang_dir}")
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HLG = compile_HLG(lang_dir)
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logging.info(f"Saving HLG.pt to {lang_dir}")
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torch.save(HLG.as_dict(), f"{lang_dir}/HLG.pt")
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if __name__ == "__main__":
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formatter = (
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"%(asctime)s %(levelname)s [%(filename)s:%(lineno)d] %(message)s"
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)
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logging.basicConfig(format=formatter, level=logging.INFO)
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main()
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1
egs/gigaspeech/ASR/local/compile_hlg.py
Symbolic link
1
egs/gigaspeech/ASR/local/compile_hlg.py
Symbolic link
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../../../librispeech/ASR/local/compile_hlg.py
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# This directory contains the language model downloaded from
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# This directory contains the language model downloaded from
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# https://huggingface.co/wgb14/gigaspeech_lm
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# https://huggingface.co/wgb14/gigaspeech_lm
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#
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#
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# - 3gram_pruned_1e7.arpa.gz
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# - 4gram.arpa.gz
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# - 4gram.arpa.gz
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# - lexicon.txt
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# - lexicon.txt
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#
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#
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# using: `sudo apt-get install git-lfs && git-lfs install`
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# using: `sudo apt-get install git-lfs && git-lfs install`
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[ ! -e $dl_dir/lm ] && mkdir -p $dl_dir/lm
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[ ! -e $dl_dir/lm ] && mkdir -p $dl_dir/lm
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git clone https://huggingface.co/wgb14/gigaspeech_lm $dl_dir/lm
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git clone https://huggingface.co/wgb14/gigaspeech_lm $dl_dir/lm
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gunzip -c $dl_dir/lm/3gram_pruned_1e7.arpa.gz > $dl_dir/lm/3gram_pruned_1e7.arpa
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gunzip -c $dl_dir/lm/4gram.arpa.gz > $dl_dir/lm/4gram.arpa
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gunzip -c $dl_dir/lm/4gram.arpa.gz > $dl_dir/lm/4gram.arpa
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fi
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fi
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mkdir -p data/lm
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mkdir -p data/lm
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if [ ! -f data/lm/G_4_gram.fst.txt ]; then
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if [ ! -f data/lm/G_3_gram.fst.txt ]; then
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# It is used in building HLG
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# It is used in building HLG
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python3 -m kaldilm \
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--read-symbol-table="data/lang_phone/words.txt" \
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--disambig-symbol='#0' \
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--max-order=3 \
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$dl_dir/lm/3gram_pruned_1e7.arpa > data/lm/G_3_gram.fst.txt
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fi
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if [ ! -f data/lm/G_4_gram.fst.txt ]; then
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# It is used for LM rescoring
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python3 -m kaldilm \
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python3 -m kaldilm \
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--read-symbol-table="data/lang_phone/words.txt" \
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--disambig-symbol='#0' \
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--disambig-symbol='#0' \
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