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why we append an all-zero frame #269

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Janfliegt opened this issue Sep 8, 2021 · 1 comment

Janfliegt commented Sep 8, 2021

I don't understand why we append an all-zero frame here. https://github.com/tensorflow/lingvo/blob/master/lingvo/tasks/asr/input_generator.py#L149
Does anyone know?

Contributor

jonathanasdf commented Sep 8, 2021

I asked around, and got this

It improves WSJ / LibriSpeech for LAS as it tell the model explicitly, "end of utterance", in the early days.

But for RNNT and later improved LAS model, it make no difference. We keep it just as consistent with old setup.

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