Re: [Kaldi-developers] converting aligments to hmm states

[Daniel P. <dp...@gm...>]

I think it's just a bug in the code.
You are doing
  int32 tid = split[i][0];
which means you get the first HMM-state in the alignment of each phone,
which will always be zero.  Instead you want to iterate over split[i] and
get tid = split[i][j].
Dan

and I want to convert the transition ids to the hmm states to be writte to
> disk. I need the triphone states as target values for a neural network.
>
> For this purpose I have copied the file ali-to-phones.cc and adapted it to
> write out what I think should be the hmm states.
> Excerpt:
> "...
>     for (; !reader.Done(); reader.Next()) {
>       std::string key = reader.Key();
>       const std::vector<int32> &alignment = reader.Value();
>
>       std::vector<std::vector<int32> > split;
>       SplitToPhones(trans_model, alignment, &split);
>
>       if (!write_lengths) {
>         std::vector<int32> states;
>         for (size_t i = 0; i < split.size(); i++) {
>           KALDI_ASSERT(split[i].size() > 0);
>           int32 tid = split[i][0];
>           int32 hmmstate = trans_model.TransitionIdToHmmState(tid);  <-- !!
>           int32 num_repeats = split[i].size();
>           KALDI_ASSERT(num_repeats!=0);
>           if (per_frame)
>             for(int32 j = 0; j < num_repeats; j++)
>               states.push_back(hmmstate);
>           else
>             states.push_back(hmmstate);
>         }
>         states_writer.Write(key, states);
>       } else {
>         ... // omitted, as not needed
>     }
> ...
> "
>
> The outcome, however, is always a vector of zeros for all utterances! This
> is true also if instead I try to convert to PdfClass.
>
> What am I missing here?
>
> Thanks in advance!
>
> Ray
>
>
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