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fix the bug when truncate_side==left #5778

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fix the bug when truncate_side==left #5778

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7 changes: 2 additions & 5 deletions paddlenlp/prompt/prompt_tokenizer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -129,17 +129,15 @@ def _create_max_lengths_from_do_truncate(self, part_text: List[str], part_do_tru
text_length = sum([len(x) for x in part_text])
num_special_token = self.tokenizer.num_special_tokens_to_add()
max_length = self.max_length - num_special_token
max_lengths = [len(part) for part in part_text]
if text_length <= max_length:
return [None] * len(part_text)
max_lengths = [None for _ in range(len(part_text))]
return max_lengths
do_truncate = [int(x) for x in part_do_truncate]

# Remove parts that can not be truncated.
for index, part in enumerate(part_text):
if not part_do_truncate[index]:
max_length -= len(part)
else:
max_lengths[index] = len(part)
if sum(do_truncate) == 0:
logger.warning(
f"Can not truncate the sequence with length {text_length}. Set more `truncate` attributes as True."
Expand All @@ -154,7 +152,6 @@ def _create_max_lengths_from_do_truncate(self, part_text: List[str], part_do_tru
for index, part in enumerate(part_text):
if do_truncate[index] == 1 and len(part) <= avg_max_length:
do_truncate[index] = 0
max_lengths[index] = len(part)
max_length -= len(part)
has_short = True
if max_length < 0:
Expand Down