Lattice Functions

[Rafael Setyan]

Hi there,

Currently I am investigating exctracting additional info from Lattices/CompactLattices, I have successfully used about all scripts located in latbin, then I found some function in https://github.com/kaldi-asr/kaldi/blob/master/src/lat/lattice-functions.h#L58 which is GetPerFrameAcousticCosts(). But when calling this function I get assertion error

ASSERTION_FAILED ([5.5.1000~1-df1e9]:GetPerFrameAcousticCosts():lattice-functions.cc:53) Assertion failed: (nbest.NumArcs(cur_state) == 1)

The input Lattice I get from CompaceLattice which I get from decoder.GetLattice(true, clat).

Then I'am using this methods to get nbest (in my case n=1) Lattice

std::vector<kaldi::Lattice> nbestLats;

    {  

        kaldi::Lattice nbest_lat;

        fst::ShortestPath(lat, &nbest_lat, numBest);

        fst::ConvertNbestToVector(nbest_lat, &nbestLats);

    }

After that calling GetPerFrameAcousticCosts I get an error. What I am doing wrong, maybe I have to call other functions on Lattice before calling this function?

Thanks in advance,

Rafayel

[Jan Yenda Trmal]

I think the error says that in some specific state there is more than one outgoing arc, which is in contrast what the doc says is precondition.

You don't show the code that includes calling GetPerFrameAcousticCosts() so hard to guess

y.

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[Jan Yenda Trmal]

Maybe grep for the calls of the function, so that you see how it is used in the codes?

y.

[Rafael Setyan]

I grep it but did not find any example. But never mind I found issue, I was just passing the wrong Lattice, now it works fine.

Also is there any paper/tutorials/blog posts about Lattices that you recommend.

Regards

[Jan Yenda Trmal]

Not sure about tutorial per se. Tutorial on FST might be also useful.

y.

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