[asterisk-speech-rec] How to enable N-Best decoding?

[missivestoadrian-vxml at yahoo.com]

HI Stephen:

A few months ago you gave a good description on how to
use the N-Best feature in Lumenvox. I think I
understand the difference between ${SPEECH_TEXT(0/0)} 
and ${SPEECH_TEXT(1/0)}. That was made clear from your
example with ($she | $sea | $he | $bee). 
Unfortunately, I'm not sure I understand the
difference between ${SPEECH_TEXT(0/0)} and
${SPEECH_TEXT(0/1)}.   Do you have an example you
could send illustrating the difference? Basically, I'm
not sure what you meant when you said: 

> If there is more than one semantic interpretation,
> you would check 0/1.

Also, the ${SPEECH(results)} variable is used to
determine the total number of N-Best results. Is there
an equivalent variable that can be used to check for
the number of "semantic interpretations"?

Kindly,

Adrian






--- Stephen Keller <StephenKeller at LumenVox.com> wrote:

> Scott (and anyone else interested in n-best),
> 
> I apologize for the delay in this response, but
> we've been working with
> Digium on troubleshooting some issues related to
> n-best using the
> LumenVox Speech Engine on Asterisk. It looks like we
> have them all
> straightened out, and the latest version of the
> Asterisk-LumenVox
> connector bridge is available on our FTP site (as
> always drop me a line
> off-list if you need the link).
> 
> To activate N-best, use
> Set(SPEECH_RESULTS_TYPE()=nbest) after
> SpeechCreate. 
> 
> You can then check results like normal, except you
> specify different
> results using ${SPEECH_TEXT(X/Y)}, where X is the
> number of the result
> to check (starting at zero) and Y is the
> interpretation.
> 
> So the first interpretation for the first n-best
> result is 0/0; e.g.
> ${SPEECH_TEXT(0/0)}. If there is more than one
> semantic interpretation,
> you would check 0/1. The second n-best result would
> be 1/0, etc.
> 
> Likewise you would use ${SPEECH_SCORE(X/Y)} in the
> same fashion to check
> confidence scores.
> 
> Here's a  very basic dial plan and grammar that
> should illustrate the
> concepts. If you use the grammar and say a valid
> choice, you will almost
> certainly get back multiple n-best results, since
> all the words are very
> similar.
> 
> exten => 1,1,Answer
> exten => 1,n,Wait(1)
> exten => 1,n,SpeechCreate
> exten => 1,n,Set(SPEECH_RESULTS_TYPE()=nbest)
> exten => 1,n,SpeechActivateGrammar(test) 
> exten => 1,n,SpeechBackground(beep) 
> exten => 1,n,Verbose(1,Number of results:
> ${SPEECH(results)}) 
> exten => 1,n,Verbose(1,First result is
> ${SPEECH_TEXT(0/0)} with a
> confidence score of ${SPEECH_SCORE(0/0)}) 
> exten => 1,n,Verbose(1,Second result is
> ${SPEECH_TEXT(1/0)} with a
> confidence score of ${SPEECH_SCORE(1/0)}) 
> 
> Test grammar:
> 
> #ABNF 1.0 UTF-8;
> 
> language en-US;
> mode voice;
> tag-format <semantics/1.0>;
> 
> root $rootrule;
> 
> $rootrule = $she | $sea | $he | $bee;
> 
> $she = she;
> $sea = sea;
> $he = he;
> $bee = bee;
> 
> --
> Stephen Keller
> LumenVox Support
> P: 877-977-0707, just say "Support"
> F: 858-707-7072
> Support at LumenVox.com
> www.LumenVox.com
> 
> 
> 
> Winner "Best Innovation in Speech Recognition"
> AVIOS SpeechTEK Award
> 
>  
> 
> 
> > -----Original Message-----
> > From: asterisk-speech-rec-bounces at lists.digium.com
> 
> >
>
[mailto:asterisk-speech-rec-bounces at lists.digium.com]
> On 
> > Behalf Of Scott Stingel
> > Sent: Monday, April 30, 2007 9:38 AM
> > To: asterisk-speech-rec at lists.digium.com
> > Subject: [asterisk-speech-rec] How to enable
> N-Best decoding?
> > 
> > Hello-
> > 
> > I'm running the Lumenvox 7.5 engine, the Lumenvox
> 1.4 connector, and 
> > Asterisk 1.4.3.   All is well, except that the
> N-Best feature 
> > does not 
> > seem to work.  As I understand it, this feature
> allows the 
> > recogniser to return multiple possibilities for
> the decoded 
> > recognition.
> > 
> > What do I have to do to enable this?   An excerpt
> from the 
> > DecodeServerLog.txt file shows these interesting
> lines before 
> > each decode.  Perhaps the "NO_OOV" is important?
> > 
> > 04/30/2007 
> >
>
09:28:12,860,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> Begin 
> > Decode Using Context-Free Grammar
> > 04/30/2007
>
09:28:12,861,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> > Loading Context Free Gramamr
> > 04/30/2007
>
09:28:12,863,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> > Retrieving words
> > 04/30/2007 
> >
>
09:28:12,864,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> Word 
> > retrieval time: 0
> > 
> > 04/30/2007 
> >
>
09:28:12,864,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> Load 
> > grammar time: 0ms
> > 04/30/2007
>
09:28:12,865,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> > Context-Free Grammar Activated: 5 ms
> > 04/30/2007
>
09:28:12,865,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> > LumenVox(161): LM("NO_OOV") deleted
> > 
> > 04/30/2007 
> >
>
09:28:12,876,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> LM= "NO_OOV"
> > 
> > 04/30/2007 
> >
>
09:28:12,877,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> nbest 
> > will not be used on this decode run
> > 04/30/2007 
> >
>
09:28:12,877,0,[AmericanEnglish][MODEL_LOW:ThreadNdx:0]
> Begin 
> > Core Decode Port
> > 
> > Thanks for any help,
> > Scott Stingel
> > 
> > www.evtmedia.com
> > 
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