[TTS] Add script for text preprocessing #6541
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What does this PR do ?
A lot of people already have a local script which does text processing & normalization before training. To do it quickly one needs to use multiprocessing or joblib, as our text normalizer does not support batch processing.
It only does normalization and optional lower casing of the final output right now, but could be extended with additional processing functionality as needed.
Collection: [TTS]
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