Re: [Kaldi-developers] hmm topology and gmm per state

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

The "power" parameter allocates Gaussians to states proportional to the
occupation count of the state, taken to this power.

Dan



On Fri, May 10, 2013 at 12:42 PM, Arif Khan <ife...@gm...> wrote:

> Hi,
>
> Thanks you very much for your reply. I have already found the scripts
> where one can introduce more than two topologies for hmm.
>
> Can we some how control or specify the #Gaussian per state, or How to find
> out the #Gaussian per state used in a given model file.
>
> Can you give me some brief explanation of the following option
>
> po.Register("power", &power, "If mixing up, power to allocate Gaussians
> to"" states.");
>
> which is found in the following two modules.
>
> 1. gmmbin/gmm-est.cc File Reference
> http://kaldi.sourceforge.net/gmm-est_8cc.html
> 2. gmmbin/gmm-mixup.cc File Reference
> http://kaldi.sourceforge.net/gmm-mixup_8cc.html
>
> Note:
>
> You sense very right, I have to redo the Aurora 2.0 experiments with
> Kaldi, Unfortunately the default implementation of Kaldi gave me
> greater WER, than
> reported in the paper. So that's why I have to come closer to the
> technique which they have adopted in Aurora 2.0 experiments with HTK.
>
> Their technique:
> Hmm Model: Word based hmm model not phone based.
> No of emitting states in HMM:  16 states for each digit, 3 states for
> Silence and 1 state for short pause (sp).
> # Gaussian per state: From 6 to 16 GM per state for digits, silence and sp.
>
> Any advice or suggestion will be welcomed and acknowledged.
>
> Regards,
> Arif
>
>
> On Fri, May 10, 2013 at 5:57 PM, Daniel Povey <dp...@gm...> wrote:
>
>> To use more than two HMM topology entries you would have to change the
>> scripts.
>> Kaldi automatically allocates the #Gaussians in each state.
>> I sense that you are trying to exactly duplicate an HTK system, which is
>> not a very good idea.
>> Dan
>>
>>
>>
>> On Fri, May 10, 2013 at 11:25 AM, Arif Khan <ife...@gm...> wrote:
>>
>>> Hi,
>>>
>>> I have question two question:
>>>
>>> 1. Can we use more than two hmm topology entries in Kaldi. For
>>> example "Silence phones", "Nonsilence phones" and "Short pause" if each one
>>> of them has different
>>> no of hmm states.
>>>
>>> 2. How can we define/control the no. of Gaussians per state for
>>> different topology entries. For example if I want to use
>>> for "Silence phones", "Nonsilence phones" and "Short pause" different no
>>> of Gaussians per state during the training.
>>>
>>> Any help will be highly appreciated.
>>>
>>> Regards,
>>> Arif
>>>
>>>
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>>
>