Kaldi HCLG 深入理解_hclg解释 kaldi

作者：笔触狂放9 | 2024-03-30 23:06:47

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hclg解释 kaldi

1. 相关部分包含的主要任务

2. HCLG

L.fst: The Phonetic Dictionary FST

L maps monophone sequences to words.

The file L.fst is the Finite State Transducer form of the lexicon with phone symbols on the input and word symbols on the output.

L_disambig.fst:The Phonetic Dictionary with Disambiguation Symbols FST

A lexicon with disambiguation symbols

FSA grammar (can be built from an n-gram grammar).

C maps triphone sequences to monophones.

Expands the phones into context-dependent phones.

H maps multiple HMM states (a.k.a. transition-ids in Kaldi-speak) to context-dependent triphones.

Expands out the HMMs. On the right are the context-dependent phones and on the left are the pdf-ids.

HCLG.fst: final graph

总结一下：

构图过程 G -> L -> C -> H

G: 作为 acceptor (输入 symbol 与输出相同)，用于对grammar 或者 language model 进行编码

L: Lexicon, 其输出 symbol 是 words, 输入 symbol 是 phones

C: context-dependency 其输出 symbol 是 phones, 其输入 symbol 为表示context-dependency phones

如： vector<int32> ctx_window = { 12, 15, 21 };

含义：id = 15 的 phone 为中心 phone, left phone id = 12, right phone id = 21

H: 包括HMM definitions,其输出 symbol 为context-dependency phones, 其输入 symbol 为transitions-ids(即对 pdf-id 和其它信息编码后的 id)

asl=="add-self-loops”

rds=="remove-disambiguation-symbols”,

and H' is H without the self-loops:

HCLG = asl(min(rds(det(H' o min(det(C o min(det(L o G))))))))

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