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adding BC for custom toks accessing slow tok attrs deprecated in v5 #43898

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Merged
itazap merged 3 commits into from
Feb 10, 2026
Merged

adding BC for custom toks accessing slow tok attrs deprecated in v5 #43898

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adding BC for custom toks accessing slow tok attrs deprecated in v5
Feb 10, 2026
6d907d6
ruff
itazap Feb 10, 2026
6880fb1
Merge branch 'main' into BC_added_tokens_encoder
itazap Feb 10, 2026
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5 changes: 5 additions & 0 deletions src/transformers/tokenization_utils_tokenizers.py
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Expand Up @@ -529,6 +529,11 @@ def added_tokens_decoder(self) -> dict[int, AddedToken]:
"""
return self._tokenizer.get_added_tokens_decoder()

# BC v5: expose ``_added_tokens_encoder`` / ``_added_tokens_decoder`` attrs for custom tokenizers that expect
# them from slow tokenizers. Only supports read, not write (won't sync to Rust backend, use add_tokens() instead
_added_tokens_encoder = added_tokens_encoder
_added_tokens_decoder = added_tokens_decoder

def get_added_vocab(self) -> dict[str, int]:
"""
Returns the added tokens in the vocabulary as a dictionary of token to index.
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