can i use fst-union to merge two different fst graph with different lexicon

[Addie]

hello in one previous post of kaldi, i found fst-union which merge two different fst graph.

so my question is 

suppose i have a.fst graph and another b.fst graph i have created with only one phrase transcription file with new lexicon, now if i merge a.fst and b.fst using fst-union which gives output as out.fst. does new out.fst graph will contain new lexicon of b.fst?

[Daniel Povey]

That will only work if the words.txt files are compatible, which they normally won't be if you are using different lexicons.  Or you could maybe map the integers and make a words.txt that covers them both.  But I won't be answering any follow-up questions on this.  You need to read about FSTs at www.openfst.org and also search online for hbka.pdf to read about how they are used in speech recognition.

Dan

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