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[Whisper] fix all issues with unk token #21250

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Merged
ArthurZucker merged 2 commits into from
Jan 23, 2023
Merged

[Whisper] fix all issues with unk token #21250

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30515fb
fix all issues with unk token
ArthurZucker Jan 23, 2023
17457a7
fixup
ArthurZucker Jan 23, 2023
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7 changes: 5 additions & 2 deletions src/transformers/models/whisper/tokenization_whisper.py
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Original file line number Diff line number Diff line change
Expand Up @@ -479,8 +479,11 @@ def _convert_token_to_id(self, token):
return self.encoder.get(token, self.encoder.get(self.unk_token))

def _convert_id_to_token(self, index):
"""Converts an index (integer) in a token (str) using the vocab."""
return self.decoder.get(index, self.decoder.get(self.unk_token_id))
"""
Converts an index (integer) in a token (str) using the vocab. Whisper's base tokenizer always decodes OOV
tokens as "", thus we do not use the `unk_token` here.
"""
return self.decoder.get(index, "")

def _normalize(self, text):
"""
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