action tags in pocketsphinx

[Anonymous]

Hi all,

Does anyone know if PocketSphinx handles action tags defined in the jsgf
format as Sphinx4 does?

as in this example:
http://cmusphinx.sourceforge.net/sphinx4/src/apps/edu/cmu/sphinx/demo/jsapi/t
ags/README.html

We are interested in using pocketsphinx because it is recomended for embeded
applications. But we need action tags.

Regards,

--
Jordi Adell

[Nickolay V. Shmyrev]

Tags are not supported by pocketsphinx yet.

[Jordi Adell]

Thank you,
I have seen the function:

/**
 * Add a "tag" transition between the given states.
 *
 * A "tag" transition is a null transition with a non-null word ID,
 * which corresponds to a semantic tag or other symbol to be output
 * when this transition is taken.
 *
 * As above, there can be at most one null or tag transition between
 * the given states; duplicates are flagged and only the best prob
 * retained.  Transition probs must be <= 1 (i.e., logprob <= 0).
 *
 * @return 1 if a new transition was added, 0 if the prob of an existing
 * transition was upgraded; -1 if nothing was changed.
 */
SPHINXBASE_EXPORT
int32 fsg_model_tag_trans_add(fsg_model_t * fsg, int32 from, int32 to,
                              int32 logp, int32 wid);

Is there a way to add such a a transition in the FSG file itself, instead of
by code?

--
Jordi

[Nickolay V. Shmyrev]

Is there a way to add such a a transition in the FSG file itself, instead of
by code?

This particular function is not used in CMUSphinx. Also this tag is different
from the one you are looking for.

[Jordi Adell]

Ok, look like this is a good reason to move to Sphinx4 in Java.
However, how much do you it would cost to someone that never looked inside the
pocketsphinx code to implement this feature in pocketsphinx?. I really want to
stay with C but I'm not sure if I can put the necessary effort for this
contribution.

[Nickolay V. Shmyrev]

I think in C it would be painful to implement. The biggest trouble is to have
a flexible data structures to parse a string against grammar which you need to
turn into a tree form like in sphinx4. And you need a javascript library.

You might better have some sort of simple frontend to parse a result than a
full-feature javascript based tag support.

[Nickolay V. Shmyrev]

And you might also want to look on Olympus project which describes grammars in
a different way and supports parsing of pocketsphinx results

http://wiki.speech.cs.cmu.edu/olympus/index.php/RavenClaw