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tiny tweak to allow BatchEncoding.token_to_char when token doesn't correspond to chars #15901

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merged 5 commits into from
Apr 21, 2022
Merged

tiny tweak to allow BatchEncoding.token_to_char when token doesn't correspond to chars #15901

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dbe121a
tweak to allow BatchEncoding.char_to_token(0)
garyhlai Mar 2, 2022
f0acf3e
update docstring
garyhlai Mar 2, 2022
473b061
remote trailing whitespace
garyhlai Mar 2, 2022
f83dfc3
make fixup
garyhlai Mar 2, 2022
edc4e1b
make value checking for span_indices explicit
garyhlai Apr 20, 2022
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7 changes: 5 additions & 2 deletions src/transformers/tokenization_utils_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -503,7 +503,8 @@ def token_to_chars(self, batch_or_token_index: int, token_index: Optional[int] =
the sequence.

Returns:
[`~tokenization_utils_base.CharSpan`]: Span of characters in the original string.
[`~tokenization_utils_base.CharSpan`]: Span of characters in the original string, or None, if the token
(e.g. <s>, </s>) doesn't correspond to any chars in the origin string.
"""

if not self._encodings:
Expand All @@ -513,7 +514,9 @@ def token_to_chars(self, batch_or_token_index: int, token_index: Optional[int] =
else:
batch_index = 0
token_index = batch_or_token_index
return CharSpan(*(self._encodings[batch_index].token_to_chars(token_index)))
span_indices = self._encodings[batch_index].token_to_chars(token_index)

return CharSpan(*span_indices) if span_indices is not None else None

def char_to_token(
self, batch_or_char_index: int, char_index: Optional[int] = None, sequence_index: int = 0
Expand Down