Re: [Kaldi-developers] Times in Kaldi Lattices

[Kartik A. <aud...@us...>]

Thanks. I understand the OpenFST format but was under the impression that
lattice-align-words will replace FST state IDs with the corresponding frame
numbers.


On Mon, Mar 11, 2013 at 8:59 AM, Daniel Povey <dp...@gm...> wrote:

> cc-ing kaldi-developers so it's archived, in case anyone has similar
> questions.
>
> You need to understand the OpenFst format.  This is the "acceptor" version
> of the format, which is (start-state end-state symbol weight), and the
> weight is (graph cost, acoustic cost, sequence of transition-ids).  [the
> "normal", non-acceptor format is start-state end-state input-symbol
> output-symbol weight].  The time can be obtained by summing up the number
> of transition-ids starting from the beginning of the lattice; in the code
> it's LatticeStateTimes.
>
> Note that the state numbers are arbitrary in a sense, they contain no real
> information.  See www.openfst.org for more info on WFSTs.
>
>
> On Mon, Mar 11, 2013 at 11:55 AM, Kartik Audhkhasi <aud...@us...>wrote:
>
>> Thanks Dan. I have started using the new scripts. However the timing
>> issue still remains. I used lattice-align-words to get times on the lattice
>> nodes in the same way as is demonstrated in the run.sh script. I think I am
>> not interpreting the times correctly. Do the IDs on both start and end
>> nodes represent frame numbers? E.g. the first line of my lattice is:
>>
>> 0       2337    44870
>> 17.0063,2553.48,9468_9482_9492_9491_9491_9491_9491_9910_9909_9909_9916_9924_9194_9210_9242_9241_9241_9241
>>
>> Does this says that word 44870 goes from frame 0 to frame 2237? The
>> transition ID sequence however shows only 18 frames.
>>
>>
>> On Sun, Mar 10, 2013 at 9:26 AM, Daniel Povey <dp...@gm...> wrote:
>>
>>> And RE how to debug it-- before and after lattice-align-words, you could
>>> run something like lattice-to-post; this program will crash if there are
>>> inconsistent times in the lattice, i.e. the lengths of input-symbol
>>> sequences are not all the same.  I suspect you actually mixed something up.
>>> Dan
>>>
>>>
>>> On Sun, Mar 10, 2013 at 12:24 PM, Daniel Povey <dp...@gm...> wrote:
>>>
>>>> It's a shame that you're using the older versions of the script.
>>>>  Currently the "s5" scripts are the canonical ones.  Your issue with times
>>>> greater than the length of the file is very unexpected.  This is not the
>>>> kind of error I would expect to ever arise.
>>>> RE getting the N-best or 1-best sequences-- the programs lattice-nbest
>>>> and lattice-1best are relevant here; they output stuff in the regular
>>>> lattice format, and you can then put them through lattice-word-align (old
>>>> scripts) or lattice-align-words (new scripts), and convert the output to,
>>>> say, ctm format-- you can check the scripts for how to convert to ctm
>>>> format, it's something like lattice-to-ctm, but there are scripts such as
>>>> get_ctm.sh and get_train_ctm.sh in s5.
>>>> Dan
>>>>
>>>>
>>>>
>>>> On Sat, Mar 9, 2013 at 8:41 PM, Kartik Audhkhasi <aud...@us...>wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I am working with Kaldi lattices and used the walign_lats.sh script to
>>>>> get times on nodes. I am using position dependent phones and believe that
>>>>> all required files are in place. However, I see that some frame numbers (in
>>>>> units of 10ms) exceed the total length of the file. Do you have any
>>>>> suggestions as to what could be going wrong?
>>>>>
>>>>> Also: Is there an easy way to get the N-best or 1-best sequences with
>>>>> word boundaries?
>>>>>
>>>>> Thanks,
>>>>> Kartik
>>>>>
>>>>> --
>>>>> Kartik Audhkhasi
>>>>>
>>>>>
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>>>>>
>>>>
>>>
>>
>>
>> --
>> Kartik Audhkhasi
>>
>
>


-- 
Kartik Audhkhasi