Are lattice-arc-post and lattice-to-post basically the same?

[Boqing Liu]

Hi all,

I want to compute the confidence of an utterance, and I am a little bit confused about the two binaries: lattice-arc-post and lattice-to-post.

In terms of lattice-to-post, I could use lattice-to-post | post-to-phone-post | ali-to-phones get-post-on-ali to get phone-level posteriors of the best path, the method used to compute posterior is forward-backward algorithm.

In terms of lattice-arc-post, I could use lattice-1best | lattice-align-phones | lattice-arc-post to get phone-level posteriors of the best path, the method used to compute posterior is also forward-backward algorithm.

I know the lattice-to-post's input is Lattice, while lattice-arc-post's input is CompactLattice.  so what's the difference between the two binaries and under what circumstances should I use the binaries lattice-arc-post and lattice-to-post? Thank you very much!

best wishes,

Boqing

[Daniel Povey]

The main difference is in how much structure they expose; lattice-to-post gives you posteriors of transition-ids on each frame while lattice-arc-post gives you information about whole arcs, which might have word or phone info depending where the lattice came from.

Lattice and CompactLattice can actually be inter-converted when reading.

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