Re: [Kaldi-users] kaldi lattice

[Hao T. <lar...@gm...>]

Thanks for the fast reply.

> 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

So label pushing sounds like a separate step before or after
determinization. Can you briefly describe the algorithm or point me to
a paper about the details?

>     It helps us to map phone sequence to corresponding word correctly.
>    With optimized lattice (determinization ), we lose word to its phone
> sequence mapping
>    information.

Can you briefly describe this algorithm as well? Do these algorithms
maintain any guarantee or are they just heuristics?

The reason I want to understand the details is that I want to know by
how much can the time information be off. I am also reading the MMI
training script, and, correct me if I am wrong, the lattice there are
not time-aligned. I guess you must assume that the time information
can not be off by too much when doing MMI training?

Hao

>
>>
>> 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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>
>