Nemo Forced Aligner parameter to reuse precalculated probs

[GreatHalf]

What does this PR do ?

Reuse pre-calculated probs in Nemo Forced Aligner to skip recalculation.

Collection: [Note which collection this PR will affect]
ASR

Changelog

• added precalculated_probs_cache_file to NFA to reuse probs & skip transcription

Usage

One way to get a relevant probs cache file is from eval_beamsearch_ngram_ctc.py. Other parameters omitted for brevity.

python ./scripts/asr_language_modeling/ngram_lm/eval_beamsearch_ngram_ctc.py \
probs_cache_file="probs_cache.pickle" \
input_manifest=$manifest \
preds_output_folder=$preds_output_folder  \
…  

manual step: add text fields from the prediction files (*.tsv) in $preds_output_folder to the $manifest

python tools/nemo_forced_aligner/align.py \
precalculated_probs_cache_file="probs_cache.pickle" \
manifest_filepath=$manifest \
…

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Additional Information

• Related to discussion Open Seq2Seq Beam Search combined with Nemo Forced Aligner #5874
• Note that "probs" are sometimes called "alignments" in the rest of the project. I decided against this here, as "aligner" is used in a different context
• to review by @erastorgueva-nv

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