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Some mistakes and a new trick
User: tpavelka
Date: 5/6/2009 4:42 am
Views: 3348
Rating: 11

First, there are mistakes in the description of HHEd commands, here is my correction:

AU - synthesize previously unseen triphones, i.e. use the set of newly created decision trees to make all the triphones included in the list

CO - compact the model set: some state definitions will be exactly the same (same means and variances etc.). To save space, only one of these states is kept in the definition, others are added to the tiedlist.

ST - save the decision trees in a file

Second, the creation of a full triphone list by HDMan must be done every time new triphones appear in testing data and does not work for cross-word triphones (these are used e.g. in HDecode). My solution for this is simply to synthesize all possible triphones. With the monophone set used by VoxForge acoustic models there is a total of 81315 triphones which translates to about 3.5MB of extra space for the HMM definitions (text form).

A full triphone list can be generated by the script full_list.prl which can be found in the directory samples/RMHTK/perl_scripts which comes with the HTK distribution.

The full triphone HMM generation can be done using HHEd:

Assume the all-triphone list is stored in file xwrd_full_list these are the commands to go into the script file (let's call it synthesize.hed):

LT "trees"
AU "xwrd_full_list"
CO "xwrdtiedlist"

HHEd is run wiht the following parameters:

HHed -T 1 -H hmmdefs -H macros -M hmm_synthesized synthesize.hed tiedlist 

where hmm_synthesized is the directory to store the new files.

 

Re: Some mistakes and a new trick
User: kmaclean
Date: 5/12/2009 2:28 pm
Views: 87
Rating: 9

Hi tpavelka,

Sorry for the delay in getting back to you, I had problems with a move data to a new HD on the Acoustic Model creation server/computer.  The move changed the modify date for all submission directories (the files were unchanged for some reason...), which then caused a cascade of problems (mirroring scripts were trying to re-create all submission tarfiles, and then, had I not killed the job, would have tried to rsync 22Gig of submission data to the VoxForge repository...).

>First, there are mistakes in the description of HHEd commands, here

>is my correction:

Thanks, fixed.

>Second, the creation of a full triphone list by HDMan must be done

>every time new triphones appear in testing data

OK, makes sense.  We never had to worry about that before since we did not have a test corpus  :)

>does not work for cross-word triphones (these are used e.g. in HDecode).

OK, for dictation apps...

>My solution for this is simply to synthesize all possible triphones.

OK, I can't do this right now, because I am still working on the Drupal migration and the related non-English submission forum cleanup.  What kind of priority would you put on this (i.e. what is the downside of not fixing this for another month or so)?

thanks again,

Ken

Re: Some mistakes and a new trick
User: tpavelka
Date: 5/13/2009 3:24 am
Views: 745
Rating: 11

Hi Ken,

I do not think there is any downside to leaving it be for some time. It is in the comments section so anyone can see it. I just wanted to add some information that is not in the tutorial and can be usefull. I have not yet responded to the thread about training scripts/tutorials because I found out that it is more complicated than I thought, I will try to respond now.

Re: Some mistakes and a new trick
User: kmaclean
Date: 5/13/2009 11:48 am
Views: 111
Rating: 10

Hi tpvelka,

OK, added to Trac as ticket #461 full triphone list.

Ken

Re: Some mistakes and a new trick
User: Ravishanker
Date: 8/2/2010 4:16 pm
Views: 66
Rating: 8

Hi Ken and tpvelka


Could you clarify how to generate the list of all triphones? Which monophones list should you give as input to the script file? fulllist file in step 10 or monophones files created in step 2.

 

Also the last parameter to the HHEd command in step 10 is tiedlist, however the tutorial specifies it as triphones1.

Thanks a ton

Re: Some mistakes and a new trick
User: kmaclean
Date: 8/22/2010 12:13 am
Views: 84
Rating: 10

>Could you clarify how to generate the list of all triphones?

See the HDMan command in Step 10 - Making Tied-State Triphones (the HTK Book provides additional info)

>Also the last parameter to the HHEd command in step 10 is tiedlist,

>however the tutorial specifies it as triphones1.

I am not sure I understand the error your pointing out... the HTK Book, section 3.3.2 Step 10 - Making Tied-State Triphones, uses:

HHEd -B -H hmm12/macros -H hmm12/hmmdefs -M hmm13 \
     tree.hed triphones1 > log

Which is also used in Step 10.

thanks,

Ken

Re: Some mistakes and a new trick
User: weedwind
Date: 4/28/2014 6:41 pm
Views: 50
Rating: 4

Hi,


When you use full_list.prl to create all the triphones, it actually creates all the monophones, biphones, and triphones. Does HDecode work with those monophones and biphones?

 

Thank you very much.

 

 


Mike

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