alphacep / alphacep/vosk-api

[clarification] The offline kaldi decode with MBR method confidence and the VOSK output confidence score is different..

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描述

We have tried the following sequence of commands to get the MBR decode using Kaldi offline(not the Kaldi fork from alphacep).

Method 1:
```
lattice-to-ctm-conf --inv-acoustic-scale=12 --decode-mbr=true "ark:gunzip -c exp/MF/model/chain/tdnn_1g_aug/MF/lat.1.gz|" - | utils/int2sym.pl -f 5 data_hindi_rnnlm_combined_text/lang/words.txt > 1.ctm
```

Method 2:
```
lattice-align-words data_hindi_rnnlm_MF/lang/phones/word_boundary.int exp/MF/model/chain/tdnn_1g_aug/final.mdl "ark:gunzip -c exp/MF/model/chain/tdnn_1g_aug/MF/lat.1.gz|" ark:- | lattice-to-ctm-conf ark:- - | utils/int2sym.pl -f 5 data_hindi_rnnlm_combined_text/lang/words.txt > 1.ctm
```

In both cases, the confidence score obtained from VOSK and Kaldi is different. Is VOSK doing any extra operations on top of the normal Kaldi output?

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