Decoders that extract lattice

[Denis]

Decoding works great, with online2-wav-nnet3-latgen-faster.  However, I assumed there would be a way to extract the lattice with a flag.  Based on the -help options, I don't see one (and increasing verbosity was not helpful).  Is this still the case?

"Currently, the only decoder that generates lattices is the class LatticeSimpleDecoder, defined in decoder/lattice-simple-decoder.h, and invoked by gmm-latgen-simple.cc."

C+P from http://kaldi-asr.org/doc/lattices.html

If not, which decoders (ideally with one of the online decoders) provide a simple way to get the lattice (alternative predictions and their confidences)?  

[Daniel Povey]

It does generate a lattice, that's actually the only form of machine-readable output it produces.  (the words on the stderr are for humans to read).

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[Denis]

That's a good answer to hear! Sorry if it's a dumb question, I expected somebody from the user base, not the author himself to answer it.  I might have a poor configuration, but I can't see any output besides the words and several entries in the log about aggregate statistics.  How do I actually see/save the lattice?  

Here's my command; (all the referenced files are standard for the ASpiRE model).

online2-wav-nnet3-latgen-faster \

    --online=false \

    --do-endpointing=false \

      --frame-subsampling-factor=3 \

      --config=exp/tdnn_7b_chain_online/conf/online.conf \

      --max-active=7000 \

      --beam=15.0 \

      --lattice-beam=6.0 \

      --acoustic-scale=1.0 \

      --word-symbol-table=exp/tdnn_7b_chain_online/graph_pp/words.txt \

      exp/tdnn_7b_chain_online/final.mdl \

      exp/tdnn_7b_chain_online/graph_pp/HCLG.fst \

      'ark:echo utterance-id1 utterance-id1|' \

      'scp:echo utterance-id1 $myFileNameHere|' \

      'ark:/dev/null'

On Monday, January 8, 2018 at 12:23:01 AM UTC-5, Dan Povey wrote:

It does generate a lattice, that's actually the only form of machine-readable output it produces.  (the words on the stderr are for humans to read).

On Sun, Jan 7, 2018 at 9:09 PM, Denis <dpe...@cs.umd.edu> wrote:

Decoding works great, with online2-wav-nnet3-latgen-faster.  However, I assumed there would be a way to extract the lattice with a flag.  Based on the -help options, I don't see one (and increasing verbosity was not helpful).  Is this still the case?

"Currently, the only decoder that generates lattices is the class LatticeSimpleDecoder, defined in decoder/lattice-simple-decoder.h, and invoked by gmm-latgen-simple.cc."

C+P from http://kaldi-asr.org/doc/lattices.html

If not, which decoders (ideally with one of the online decoders) provide a simple way to get the lattice (alternative predictions and their confidences)?  

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[Denis]

I guess the "it" is ambiguous in the response.  I'm most interested in online2-wav-nnet3-latgen-faster, or any of the online ones generating a lattice.  I was asking if it was the case that "the only decoder that generates lattices is the class LatticeSimpleDecoder", or if perhaps this been expanded.  

[Daniel Povey]

That is out of date; I'll fix it.  Also it's referring to code-level decoders.  Run the program without args to see usage.

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