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[Tokenizer] Fix decode output with space in decode_token #9010

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merged 3 commits into from
Sep 19, 2024
Merged

[Tokenizer] Fix decode output with space in decode_token #9010

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6284fb2
fix
DrownFish19 Aug 26, 2024
c7d3ad8
Merge branch 'PaddlePaddle:develop' into dev_20240826_fix_decode_token
DrownFish19 Aug 27, 2024
0cd1c52
fix
DrownFish19 Aug 28, 2024
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10 changes: 7 additions & 3 deletions paddlenlp/transformers/tokenizer_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1875,10 +1875,14 @@ def decode_token(
"""tokenizer decoding for the streaming generation use case. This method can be overrided for tokenizer that doesn't follow this API"""
# The prefix text is necessary only to defeat cleanup algorithms in the decode
# which decide to add a space or not depending on the surrounding ids.
prefix_text = self.decode(all_input_ids[prefix_offset:read_offset], skip_special_tokens=False)
new_text = self.decode(all_input_ids[prefix_offset:], skip_special_tokens=False)
prefix_text = self.decode(
all_input_ids[prefix_offset:read_offset], skip_special_tokens=False, clean_up_tokenization_spaces=False
)
new_text = self.decode(
all_input_ids[prefix_offset:], skip_special_tokens=False, clean_up_tokenization_spaces=False
)

if len(new_text) > len(prefix_text) and not new_text.endswith("�"):
if len(new_text) > len(prefix_text) and not prefix_text.endswith("�") and not new_text.endswith("�"):
# utf-8 char at the end means it's a potential unfinished byte sequence
# from byte fallback tokenization.
# If it's in the middle, it's probably a real invalid id generated
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