def tokenize_with_offsets(self, text_input):
"""Performs basic word tokenization for BERT.
Args:
text_input: A `Tensor` or `RaggedTensor` of untokenized UTF-8 strings.
Returns:
A `RaggedTensor` of tokenized strings from text_input.
"""
# lowercase and strip accents (if option is set)
if self._lower_case:
text_input = case_fold_utf8(text_input)
text_input = normalize_utf8(text_input, "NFD")
text_input = string_ops.regex_replace(text_input, r"\p{Mn}", "")
else:
# utf8 normalization
if self._normalization_form is not None:
text_input = normalize_utf8(text_input,
self._normalization_form)
# strip out control characters
text_input = string_ops.regex_replace(text_input, r"\p{Cc}|\p{Cf}",
" ")
return regex_split_ops.regex_split_with_offsets(
text_input, _DELIM_REGEX_PATTERN, self._keep_delim_regex_pattern,
"BertBasicTokenizer")
def testRegexSplitOp(self,
text_input,
delim_regex_pattern,
expected,
keep_delim_regex_pattern=r"",
descr="",
input_is_dense=False,
ragged_rank=None):
if input_is_dense:
text_input = constant_op.constant(text_input)
else:
text_input = ragged_factory_ops.constant(text_input,
ragged_rank=ragged_rank)
actual_tokens, start, end = regex_split_ops.regex_split_with_offsets(
input=text_input,
delim_regex_pattern=delim_regex_pattern,
keep_delim_regex_pattern=keep_delim_regex_pattern,
)
self.assertAllEqual(actual_tokens, expected)
# Use the offsets to extract substrings and verify that the substrings match
# up with the expected tokens
extracted_tokens = _ragged_substr(
array_ops.expand_dims(text_input, -1), start, end - start)
if extracted_tokens is not None:
self.assertAllEqual(extracted_tokens, expected)
def testRegexSplitOp(self,
text_input,
delim_regex_pattern,
expected,
keep_delim_regex_pattern=r""):
text_input = ragged_factory_ops.constant(text_input)
actual_tokens, start, end = regex_split_ops.regex_split_with_offsets(
input=text_input,
delim_regex_pattern=delim_regex_pattern,
keep_delim_regex_pattern=keep_delim_regex_pattern,
)
self.assertAllEqual(actual_tokens, expected)
# Use the offsets to extract substrings and verify that the substrings match
# up with the expected tokens
extracted_tokens = _ragged_substr(text_input, start, end)
self.assertAllEqual(extracted_tokens, expected)
def break_sentences_with_offsets(self, input): # pylint: disable=redefined-builtin
return regex_split_ops.regex_split_with_offsets(input,
self._new_sentence_regex)