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Replace placeholder tokens as specified in added_tokens_decoder #44468

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Merged
itazap merged 1 commit into from
Mar 5, 2026
Merged

Replace placeholder tokens as specified in added_tokens_decoder #44468

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13 changes: 13 additions & 0 deletions src/transformers/tokenization_utils_tokenizers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -217,6 +217,19 @@ def convert_to_native_format(cls, trust_remote_code=False, **kwargs):
):
vocab = local_kwargs.pop("vocab", None)
merges = local_kwargs.pop("merges", None)

# Replace placeholder tokens as specified in added_tokens_decoder
added_tokens_decoder = local_kwargs.get("added_tokens_decoder") or {}
if vocab is not None and added_tokens_decoder:
id_to_token = {token_id: token for token, token_id in vocab.items()}
for token_id, new_token in added_tokens_decoder.items():
token_id = int(token_id)
new_token = str(new_token)
current_token = id_to_token.get(token_id)
if current_token and current_token != new_token and new_token not in vocab:
vocab[new_token] = vocab.pop(current_token)
id_to_token[token_id] = new_token

tokenizer_object = SpmConverter.build_tokenizer_from_spm_proto(
proto=extractor.proto,
vocab=vocab,
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