PocketSphinx - language model switching

[Anonymous]

I want to switch language dynamically and the tutorial is not clear.

From http://cmusphinx.sourceforge.net/wiki/tuturialpocketsphinx, it says:

---

Finally, language model switching is quite different. The decoder is always
associated with a language model set object (yes, even if there is only one
language model). Switching language models is accomplished by:

1. Getting a handle to the language model set object: ps_get_lmset(ps_decoder_t *ps)
2. Selecting the new language model: ngram_model_set_select()
3. Telling the decoder the language model set has been updated: ps_update_lmset()

---

My question is how to set up the language model set object (ps_decoder_t) in
the first place so it can be passed to ps_get_lmset?

[Nickolay V. Shmyrev]

My question is how to set up the language model set object (ps_decoder_t) in
the first place so it can be passed to ps_get_lmset?

You don't need to setup anything. Lmset is a part of the decoder and it's
still used by it. You just get a pointer on lmset which you can modify. After
lmset is updated decoder is updated automatically.

For example of using lmset_update see test/unit/test_lm_read.c

[Anonymous]

Thanks for the reply.

I think my question should be "How to load multiple languages at once?". In
the tutorial it is loaded like this:

config = cmd_ln_init(NULL, ps_args(), TRUE,
"-hmm", MODELDIR "/hmm/en_US/hub4wsj_sc_8k",
"-lm", MODELDIR "/lm/en/turtle.DMP",
"-dict", MODELDIR "/lm/en/turtle.dic",
NULL);

In my case, I am using the PocketSphinxAndroidDemo project and the language
model is loaded in RecognizerTask.java like this:

Config c = new Config();
/
In 2.2 and above we can use getExternalFilesDir() or whatever it's
called
/
c.setString("-hmm",
"/sdcard/Android/data/edu.cmu.pocketsphinx/hmm/en_US/hub4wsj_sc_8k");
c.setString("-dict",
"/sdcard/Android/data/edu.cmu.pocketsphinx/lm/en_US/hub4.5000.dic");
c.setString("-lm",
"/sdcard/Android/data/edu.cmu.pocketsphinx/lm/en_US/hub4.5000.DMP");

I am thinking creating a new Config object to load language model every time a
different language is selected, so it doesn't have to load all the models at
once. Loading all models at once seems bad.