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add ctc prefix beam search attention decoder rescoring

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This commit is contained in:
pkufool 2024-09-26 15:27:03 +08:00
parent 0c096a9ab4
commit baa61723b6
2 changed files with 24 additions and 3 deletions
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24
egs/gigaspeech/ASR/zipformer/ctc_decode.py
View File

@ -1,9 +1,10 @@
#!/usr/bin/env python3
#
# Copyright 2021-2022 Xiaomi Corporation (Author: Fangjun Kuang,
# Copyright 2021-2024 Xiaomi Corporation (Author: Fangjun Kuang,
# Liyong Guo,
# Quandong Wang,
# Zengwei Yao)
# Zengwei Yao,
# Wei Kang)
#
# See ../../../../LICENSE for clarification regarding multiple authors
#
@ -135,6 +136,7 @@ from icefall.checkpoint import (
from icefall.decode import (
ctc_greedy_search,
ctc_prefix_beam_search,
ctc_prefix_beam_search_attention_decoder_rescoring,
get_lattice,
nbest_decoding,
nbest_oracle,
@ -435,6 +437,22 @@ def decode_one_batch(
key = "prefix-beam-search"
return {key: hyps}
if params.decoding_method == "ctc-prefix-beam-search-attention-decoder-rescoring":
best_path_dict = ctc_prefix_beam_search_attention_decoder_rescoring(
ctc_output=ctc_output,
attention_decoder=model.attention_decoder,
encoder_out=encoder_out,
encoder_out_lens=encoder_out_lens,
)
ans = dict()
for a_scale_str, token_ids in best_path_dict.items():
# hyps is a list of str, e.g., ['xxx yyy zzz', ...]
hyps = bpe_model.decode(token_ids)
# hyps is a list of list of str, e.g., [['xxx', 'yyy', 'zzz'], ... ]
hyps = [s.split() for s in hyps]
ans[a_scale_str] = hyps
return ans
supervision_segments = torch.stack(
(
supervisions["sequence_idx"],
@ -760,6 +778,7 @@ def main():
assert params.decoding_method in (
"ctc-greedy-search",
"prefix-beam-search",
"ctc-prefix-beam-search-attention-decoder-rescoring",
"ctc-decoding",
"1best",
"nbest",
@ -814,6 +833,7 @@ def main():
"ctc-greedy-search",
"ctc-decoding",
"prefix-beam-search",
"ctc-prefix-beam-search-attention-decoder-rescoring",
"attention-decoder-rescoring-no-ngram",
]:
HLG = None

3
icefall/decode.py
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@ -1,4 +1,5 @@
# Copyright 2021 Xiaomi Corp. (authors: Fangjun Kuang)
# Copyright 2021-2024 Xiaomi Corp. (authors: Fangjun Kuang,
# Wei Kang)
#
# See ../../../../LICENSE for clarification regarding multiple authors
#