Re: [Kaldi-users] kaldi lattice

[Haihua Xu <hh...@gm...>]

This is also hard for me :-)


On Wed, Oct 23, 2013 at 3:54 PM, Hao Tang <lar...@gm...> wrote:

> Hi,
>
> 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?
>


> Theoretically, I think label pushing is concerned with lattice
>
    determinization operation.
    Deteminized lattice  means less redundancy with regarding to transition
number  in lattice,
    and less redundancy means more sharing,  but more sharing must keep
    the one-input-to-one-ouput rule, thus we are doing this by label
pushing.

   If lattice has no word output, there should be no label pushing
concerned with derterminization


In addition, what is latbin/lattice-align-words.cc doing exactly?
>
    It helps us to map phone sequence to corresponding word correctly.
   With optimized lattice (determinization ), we lose word to its phone
sequence mapping
   information.


> 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?
>

    I agree with your understanding :-)

    Haihua


>
> Thanks,
> Hao
>
>
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