Re: [Kaldi-users] kaldi lattice

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

I just updated that paragraph to the below.

 If you want the time information of the lattices explicitly (rather than having
 to count transition-ids), there is a function LatticeStateTimes (for Lattice),
 and CompactLatticeStateTimes (for CompactLattice), which will give you the time
 where each state is located (a number from 0 to the number of frames in the
 file).  Be careful that in general, the words are not synchronized with to the
 transition-ids, meaning that the transition-ids on an arc won't necessarily all
 belong to the word whose label is on that arc.  This means that the times you
 get from the lattice will (as far as the word labels are concerned) be inexact.
 The same is also true of the weights; these are also not synchronized with
 either the words or the transition-ids on a particular arc.  If you want exact
 times (e.g. for conversion to HTK lattices, or for sclite scoring), then you
 should run the program lattice-align-words.  This program only works if you
 built your system with word-position-dependent phones, and it requires certain
 command-line options to tell it which phones are in which position in the word.
 See egs/wsj/s3/run.sh for an example (search for align).  There is an
 alternative program, lattice-align-words-lexicon, that you can use if your
 system does not have word-position-dependent phones.

Dan



>
> I'm trying to understand the last paragraph in the lattice page.
>
> http://kaldi.sourceforge.net/lattices.html
>
> What does it mean that the labels are pushed relative to the
> transition-ids and why does Kaldi choose to do this?
>
> In addition, what is latbin/lattice-align-words.cc doing exactly?
> After aligning, I see plenty of silence phones appear in the lattice,
> and the weights seem to be pushed. I assume the weights after aligning
> are not meaningful for individual edges anymore and are only
> meaningful for the whole path?
>
> Thanks,
> Hao
>
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