Add ReorderPhonemeInventoryJob

[Icemole]

Asserts that the units in the phonetic inventory of the ref_lex are equal to those of the lex_to_modify, and enforces the ordering in the phonetic lex_to_modify to be the exact same ordering as ref_lex.

Useful if a given pipeline has use cases in which the order of the phonetic units inside the lexicon matters.

[sarahberanek]

What a dangerous thing to do :-) I mean re-ordering the phonemes. But PR looks good to me. I am sure you tested it already.

[Icemole]

What a dangerous thing to do :-) I mean re-ordering the phonemes.

Indeed... However, this job has a purpose. If we don't use any state-tying file, the NN softmax output labels are obtained from the phonetic inventory. As a consequence, we need to have a consistent order between training and recognition lexicon phonemes so that we can output the same labels in recognition as the ones we learned in training. And I'm certain that I have a training/recognition lexicon pair for which consistent phonetic ordering is not happening. I hope we don't have to use this job much, but just in case it's beneficial for anyone or for some other use case, I decided to push it here.

I am sure you tested it already.

Yes, I went through the phoneme set and it was ordered as expected!