def get_answer_fields(
self, **kwargs: Dict[str, Any]) -> Tuple[Dict[str, Field], bool]:
answer_texts: List[str] = kwargs['answer_texts']
fields: Dict[str, Field] = {}
target_numbers = get_target_numbers(answer_texts)
numbers_for_count = list(range(self._max_count + 1))
valid_counts: List[int] = DropReader.find_valid_counts(
numbers_for_count, target_numbers)
if len(valid_counts) > 0:
has_answer = True
counts_field: List[Field] = [
LabelField(count_label, skip_indexing=True)
for count_label in valid_counts
]
fields['answer_as_counts'] = ListField(counts_field)
else:
has_answer = False
fields.update(self.get_empty_answer_fields(**kwargs))
return fields, has_answer
def load_drop_data():
DROP_DEV_FILE = '/home/tony/answer-generation/raw_data/drop/drop_dataset_dev.json'
data = {}
with open(DROP_DEV_FILE) as dataset_file:
dataset = json.load(dataset_file)
for passage_id, passage_info in dataset.items():
passage = clean_string(passage_info["passage"])
for question_answer in passage_info["qa_pairs"]:
question_id = question_answer["query_id"]
question = clean_string(question_answer["question"])
answer_annotations = []
if "answer" in question_answer:
answer_annotations.append(question_answer["answer"])
if "validated_answers" in question_answer:
answer_annotations += question_answer["validated_answers"]
# Extract out the label per annotation
answer_annotations = [
' '.join(DropReader.extract_answer_info_from_annotation(a)[1])
for a in answer_annotations
]
# Get the most common answer as the gold answer
reference = clean_string(str(most_frequent(answer_annotations)))
data[question_id] = {
'context': passage,
'question': question,
'reference': reference,
'candidates': set()
}
return data
def clean(self, passage, question, answer, passage_tagging,
question_tagging):
passage_tokens = [Token(w) for w in passage_tagging['words']]
spans = DropReader.find_valid_spans(passage_tokens, answer['spans'])
new_answer_texts = []
cleaned = False
for answer_text in answer['spans']:
valid = True
for span in spans:
span_text = ' '.join(passage_tagging['words'][span[0]:span[1] +
1]).lower()
if answer_text.lower() != span_text:
continue
if any(tag != 'O'
for tag in passage_tagging['tags'][span[0]:span[1] +
1]):
valid = False
cleaned = True
break
if valid:
new_answer_texts.append(answer_text)
if not cleaned:
return None
new_answer = answer.copy()
new_answer['spans'] = new_answer_texts
return {'answer': new_answer}
def text_to_instance(
self,
question_text: str,
passage_text: str,
passage_tokens: List[Token],
passage_spans: List[Tuple[int, int]],
numbers_in_passage: List[Any],
number_words: List[str],
number_indices: List[int],
number_len: List[int],
question_id: str = None,
passage_id: str = None,
answer_annotations: List[Dict] = None) -> Union[Instance, None]:
# Tokenize question and passage
question_tokens = self.tokenizer.tokenize(question_text)
qlen = len(question_tokens)
plen = len(passage_tokens)
question_passage_tokens = [Token('[CLS]')] + question_tokens + [
Token('[SEP]')
] + passage_tokens
if len(question_passage_tokens) > self.max_pieces - 1:
question_passage_tokens = question_passage_tokens[:self.
max_pieces - 1]
passage_tokens = passage_tokens[:self.max_pieces - qlen - 3]
plen = len(passage_tokens)
number_indices, number_len, numbers_in_passage = \
clipped_passage_num(number_indices, number_len, numbers_in_passage, plen)
question_passage_tokens += [Token('[SEP]')]
number_indices = [index + qlen + 2 for index in number_indices] + [-1]
# Not done in-place so they won't change the numbers saved for the passage
number_len = number_len + [1]
numbers_in_passage = numbers_in_passage + [0]
number_tokens = [Token(str(number)) for number in numbers_in_passage]
extra_number_tokens = [Token(str(num)) for num in self.extra_numbers]
mask_indices = [0, qlen + 1, len(question_passage_tokens) - 1]
if self.extract_spans:
# adapt indexes to question_passage_tokens sequence
passage_spans = [(span[0] + qlen + 2, span[1] + qlen + 2)
for span in passage_spans]
# remove spans of truncated part of passage
passage_spans = [
span for span in passage_spans
if span[1] <= len(question_passage_tokens)
]
# make span indexes inclusive
passage_spans = [(span[0], span[1] - 1) for span in passage_spans]
fields: Dict[str, Field] = {}
# Add feature fields
question_passage_field = TextField(question_passage_tokens,
self.token_indexers)
fields["question_passage"] = question_passage_field
if self.extract_spans:
passage_span_fields = [
SpanField(span[0], span[1], question_passage_field)
for span in passage_spans
]
fields["passage_spans"] = ListField(passage_span_fields)
number_token_indices = \
[ArrayField(np.arange(start_ind, start_ind + number_len[i]), padding_value=-1)
for i, start_ind in enumerate(number_indices)]
fields["number_indices"] = ListField(number_token_indices)
numbers_in_passage_field = TextField(number_tokens,
self.token_indexers)
extra_numbers_field = TextField(extra_number_tokens,
self.token_indexers)
all_numbers_field = TextField(extra_number_tokens + number_tokens,
self.token_indexers)
mask_index_fields: List[Field] = [
IndexField(index, question_passage_field) for index in mask_indices
]
fields["mask_indices"] = ListField(mask_index_fields)
# Compile question, passage, answer metadata
metadata = {
"original_passage": passage_text,
"original_question": question_text,
"original_numbers": numbers_in_passage,
"original_number_words": number_words,
"extra_numbers": self.extra_numbers,
"passage_tokens": passage_tokens,
"question_tokens": question_tokens,
"question_passage_tokens": question_passage_tokens,
"passage_id": passage_id,
"question_id": question_id
}
if answer_annotations:
for annotation in answer_annotations:
tokenized_spans = [[
token.text for token in self.tokenizer.tokenize(answer)
] for answer in annotation['spans']]
annotation['spans'] = [
tokenlist_to_passage(token_list)
for token_list in tokenized_spans
]
# Get answer type, answer text, tokenize
answer_type, answer_texts = DropReader.extract_answer_info_from_annotation(
answer_annotations[0])
tokenized_answer_texts = []
num_spans = min(len(answer_texts), self.max_spans)
for answer_text in answer_texts:
answer_tokens = self.tokenizer.tokenize(answer_text)
tokenized_answer_texts.append(' '.join(
token.text for token in answer_tokens))
metadata["answer_annotations"] = answer_annotations
metadata["answer_texts"] = answer_texts
metadata["answer_tokens"] = tokenized_answer_texts
# Find answer text in question and passage
valid_question_spans = DropReader.find_valid_spans(
question_tokens, tokenized_answer_texts)
for span_ind, span in enumerate(valid_question_spans):
valid_question_spans[span_ind] = (span[0] + 1, span[1] + 1)
valid_passage_spans = DropReader.find_valid_spans(
passage_tokens, tokenized_answer_texts)
for span_ind, span in enumerate(valid_passage_spans):
valid_passage_spans[span_ind] = (span[0] + qlen + 2,
span[1] + qlen + 2)
# Get target numbers
target_numbers = []
for answer_text in answer_texts:
number = self.word_to_num(answer_text)
if number is not None:
target_numbers.append(number)
# Get possible ways to arrive at target numbers with add/sub
valid_expressions: List[List[int]] = []
exp_strings = None
if answer_type in ["number", "date"]:
if self.exp_search == 'full':
expressions = get_full_exp(
list(enumerate(self.extra_numbers +
numbers_in_passage)), target_numbers,
self.operations, self.op_dict, self.max_depth)
zipped = list(zip(*expressions))
if zipped:
valid_expressions = list(zipped[0])
exp_strings = list(zipped[1])
elif self.exp_search == 'add_sub':
valid_expressions = \
DropReader.find_valid_add_sub_expressions(self.extra_numbers + numbers_in_passage,
target_numbers,
self.max_numbers_expression)
elif self.exp_search == 'template':
valid_expressions, exp_strings = \
get_template_exp(self.extra_numbers + numbers_in_passage,
target_numbers,
self.templates,
self.template_strings)
exp_strings = sum(exp_strings, [])
# Get possible ways to arrive at target numbers with counting
valid_counts: List[int] = []
if answer_type in ["number"]:
numbers_for_count = list(range(self.max_count + 1))
valid_counts = DropReader.find_valid_counts(
numbers_for_count, target_numbers)
# Update metadata with answer info
answer_info = {
"answer_passage_spans": valid_passage_spans,
"answer_question_spans": valid_question_spans,
"num_spans": num_spans,
"expressions": valid_expressions,
"counts": valid_counts
}
if self.exp_search in ['template', 'full']:
answer_info['expr_text'] = exp_strings
metadata["answer_info"] = answer_info
# Add answer fields
passage_span_fields: List[Field] = [
SpanField(span[0], span[1], question_passage_field)
for span in valid_passage_spans
]
if not passage_span_fields:
passage_span_fields.append(
SpanField(-1, -1, question_passage_field))
fields["answer_as_passage_spans"] = ListField(passage_span_fields)
question_span_fields: List[Field] = [
SpanField(span[0], span[1], question_passage_field)
for span in valid_question_spans
]
if not question_span_fields:
question_span_fields.append(
SpanField(-1, -1, question_passage_field))
fields["answer_as_question_spans"] = ListField(
question_span_fields)
if self.exp_search == 'add_sub':
add_sub_signs_field: List[Field] = []
extra_signs_field: List[Field] = []
for signs_for_one_add_sub_expressions in valid_expressions:
extra_signs = signs_for_one_add_sub_expressions[:len(
self.extra_numbers)]
normal_signs = signs_for_one_add_sub_expressions[
len(self.extra_numbers):]
add_sub_signs_field.append(
SequenceLabelField(normal_signs,
numbers_in_passage_field))
extra_signs_field.append(
SequenceLabelField(extra_signs, extra_numbers_field))
if not add_sub_signs_field:
add_sub_signs_field.append(
SequenceLabelField([0] * len(number_tokens),
numbers_in_passage_field))
if not extra_signs_field:
extra_signs_field.append(
SequenceLabelField([0] * len(self.extra_numbers),
extra_numbers_field))
fields["answer_as_expressions"] = ListField(
add_sub_signs_field)
if self.extra_numbers:
fields["answer_as_expressions_extra"] = ListField(
extra_signs_field)
elif self.exp_search in ['template', 'full']:
expression_indices = []
for expression in valid_expressions:
if not expression:
expression.append(3 * [-1])
expression_indices.append(
ArrayField(np.array(expression), padding_value=-1))
if not expression_indices:
expression_indices = \
[ArrayField(np.array([3 * [-1]]), padding_value=-1) for _ in range(len(self.templates))]
fields["answer_as_expressions"] = ListField(expression_indices)
count_fields: List[Field] = [
LabelField(count_label, skip_indexing=True)
for count_label in valid_counts
]
if not count_fields:
count_fields.append(LabelField(-1, skip_indexing=True))
fields["answer_as_counts"] = ListField(count_fields)
fields["num_spans"] = LabelField(num_spans, skip_indexing=True)
fields["metadata"] = MetadataField(metadata)
return Instance(fields)
def text_to_instance(self,
question_text: str,
passage_text: str,
passage_tokens: List[Token],
numbers_in_passage: List[Any],
number_words: List[str],
number_indices: List[int],
number_len: List[int],
question_id: str = None,
passage_id: str = None,
answer_annotations: List[Dict] = None,
specific_answer_type: str = None) -> Optional[Instance]:
# Tokenize question and passage
'''
### all_number_in_qp_tokens = [qp_tokens[idx] for idx in number_indices]
unit_tokens = self.tokenizer.tokenize(answer_annotations[0]['unit'])
valid_unit_spans = DropReader.find_valid_spans(question_tokens, [answer_annotations[0]['unit']])
assert len(valid_unit_spans) == 1
### index + 1 since there is an CLS token at the front
valid_unit_spans = [(valid_unit_spans[0][0]+1, valid_unit_spans[0][1]+1)]
'''
question_tokens = self.tokenizer.tokenize(question_text)
question_tokens = fill_token_indices(question_tokens, question_text, self._uncased, self.basic_tokenizer)
qlen = len(question_tokens)
qp_tokens = [Token('[CLS]')] + question_tokens + [Token('[SEP]')] + passage_tokens
# if qp has more than max_pieces tokens (including CLS and SEP), clip the passage
max_passage_length = -1
if len(qp_tokens) > self.max_pieces - 1:
qp_tokens = qp_tokens[:self.max_pieces - 1]
passage_tokens = passage_tokens[:self.max_pieces - qlen - 3]
plen = len(passage_tokens)
number_indices, number_len, numbers_in_passage = \
clipped_passage_num(number_indices, number_len, numbers_in_passage, plen)
max_passage_length = token_to_span(passage_tokens[-1])[1] if plen > 0 else 0
qp_tokens += [Token('[SEP]')]
# update the indices of the numbers with respect to the question.
# Not done in-place so they won't change the numbers saved for the passage
number_indices = [index + qlen + 2 for index in number_indices] + [-1]
number_len = number_len + [1]
numbers_in_passage = numbers_in_passage + [0]
number_tokens = [Token(str(number)) for number in numbers_in_passage]
extra_number_tokens = [Token(str(num)) for num in self.extra_numbers]
mask_indices = [0, qlen + 1, len(qp_tokens) - 1]
fields: Dict[str, Field] = {}
# Add feature fields
qp_field = TextField(qp_tokens, self.token_indexers)
fields["question_passage"] = qp_field
number_token_indices = \
[ArrayField(np.arange(start_ind, start_ind + number_len[i]), padding_value=-1)
for i, start_ind in enumerate(number_indices)]
fields["number_indices"] = ListField(number_token_indices)
numbers_in_passage_field = TextField(number_tokens, self.token_indexers)
extra_numbers_field = TextField(extra_number_tokens, self.token_indexers)
mask_index_fields: List[Field] = [IndexField(index, qp_field) for index in mask_indices]
fields["mask_indices"] = ListField(mask_index_fields)
# Compile question, passage, answer metadata
metadata = {"original_passage": passage_text,
"original_question": question_text,
"original_numbers": numbers_in_passage,
"original_number_words": number_words,
"extra_numbers": self.extra_numbers,
"passage_tokens": passage_tokens,
"question_tokens": question_tokens,
"question_passage_tokens": qp_tokens,
"passage_id": passage_id,
"question_id": question_id,
"max_passage_length": max_passage_length}
# in a word broken up into pieces, every piece except the first should be ignored when calculating the loss
wordpiece_mask = [not token.text.startswith('##') for token in qp_tokens]
wordpiece_mask = np.array(wordpiece_mask)
fields['bio_wordpiece_mask'] = ArrayField(wordpiece_mask, dtype=np.int64)
if answer_annotations:
# Get answer type, answer text, tokenize
# For multi-span, remove repeating answers. Although possible, in the dataset it is mostly mistakes.
if answer_annotations[0]['yesno']:
answer_type = YESNO_ANSER_TYPE
answer_texts = 'true' if answer_annotations[0]['yesno'] == '1' else 'false'
else:
answer_type, answer_texts = DropReader.extract_answer_info_from_annotation(answer_annotations[0])
if answer_type == SPAN_ANSWER_TYPE:
answer_texts = list(OrderedDict.fromkeys(answer_texts))
tokenized_answer_texts = []
for answer_text in answer_texts:
answer_tokens = self.tokenizer.tokenize(answer_text)
tokenized_answer_text = ' '.join(token.text for token in answer_tokens)
if tokenized_answer_text not in tokenized_answer_texts and tokenized_answer_text != '':
tokenized_answer_texts.append(tokenized_answer_text)
metadata["answer_annotations"] = answer_annotations
metadata["answer_texts"] = answer_texts
metadata["answer_tokens"] = tokenized_answer_texts
# Find unit text in question
# import pdb; pdb.set_trace()
if answer_annotations[0]['unit'] != '':
# print('answer_annotations[0][unit] = '+str(answer_annotations[0]['unit']))
valid_unit_spans = DropReader.find_valid_spans(question_tokens, [answer_annotations[0]['unit']])
## assert len(valid_unit_spans) <= 1
### index + 1 since there is an CLS token at the front
valid_unit_spans = [(unit_span[0]+1, unit_span[1]+1) for unit_span in valid_unit_spans]
else:
valid_unit_spans = []
# Find answer text in question and passage
# if len(tokenized_answer_texts)==1 and tokenized_answer_texts[0] == '':
# import pdb; pdb.set_trace()
valid_question_spans = DropReader.find_valid_spans(question_tokens, tokenized_answer_texts)
for span_ind, span in enumerate(valid_question_spans):
valid_question_spans[span_ind] = (span[0] + 1, span[1] + 1)
valid_passage_spans = DropReader.find_valid_spans(passage_tokens, tokenized_answer_texts)
for span_ind, span in enumerate(valid_passage_spans):
valid_passage_spans[span_ind] = (span[0] + qlen + 2, span[1] + qlen + 2)
# throw away an instance in training if a span appearing in the answer is missing from the question and passage
if self._is_training:
if specific_answer_type in SPAN_ANSWER_TYPES:
for tokenized_answer_text in tokenized_answer_texts:
temp_spans = DropReader.find_valid_spans(qp_field, [tokenized_answer_text])
if len(temp_spans) == 0:
return None
# Get target numbers
target_numbers = []
if specific_answer_type != MULTIPLE_SPAN or self.multispan_allow_all_heads_to_answer:
for answer_text in answer_texts:
number = self.word_to_num(answer_text, self.improve_number_extraction)
if number is not None:
target_numbers.append(number)
# Get possible ways to arrive at target numbers with add/sub
valid_expressions: List[List[int]] = []
exp_strings = None
if answer_type in ["number", "date"]:
if self.target_number_rounding:
valid_expressions = \
find_valid_add_sub_expressions_with_rounding(
self.extra_numbers + numbers_in_passage,
target_numbers,
self.max_numbers_expression)
else:
valid_expressions = \
DropReader.find_valid_add_sub_expressions(self.extra_numbers + numbers_in_passage,
target_numbers,
self.max_numbers_expression)
if len(target_numbers) == 0:
import pdb; pdb.set_trace()
if self.discard_impossible_number_questions:
# The train set was verified to have all of its target_numbers lists of length 1.
if (answer_type == "number" and
len(valid_expressions) == 0 and
self._is_training and
self.max_count < target_numbers[0]):
# The number to predict can't be derived from any head, so we shouldn't train on it.
# arithmetic - no expressions that yield the number to predict.
# counting - the maximal count is smaller than the number to predict.
# However, although the answer is marked in the dataset as a number type answer,
# maybe it cannot be found due to a bug in DROP's text parsing.
# So in addition, we try to find the answer as a span in the text.
# If the answer is indeed a span in the text, we don't discard that question.
if len(valid_question_spans) == 0 and len(valid_passage_spans) == 0:
return None
if not self.keep_impossible_number_questions_which_exist_as_spans:
return None
# Get possible ways to arrive at target numbers with counting
valid_counts: List[int] = []
if answer_type in ["number"]:
numbers_for_count = list(range(self.max_count + 1))
valid_counts = DropReader.find_valid_counts(numbers_for_count, target_numbers)
valid_yesno: int = -1
if answer_type in ["yesno"]:
valid_yesno = 1 if answer_texts == 'true' else 0
# Update metadata with answer info
answer_info = {"answer_passage_spans": valid_passage_spans,
"answer_question_spans": valid_question_spans,
"expressions": valid_expressions,
"counts": valid_counts,
"unit": valid_unit_spans,
"yesno": valid_yesno}
metadata["answer_info"] = answer_info
# Add answer fields
passage_span_fields: List[Field] = []
if specific_answer_type != MULTIPLE_SPAN or self.multispan_allow_all_heads_to_answer:
passage_span_fields: List[Field] = [SpanField(span[0], span[1], qp_field) for span in valid_passage_spans]
if not passage_span_fields:
passage_span_fields.append(SpanField(-1, -1, qp_field))
fields["answer_as_passage_spans"] = ListField(passage_span_fields)
question_span_fields: List[Field] = []
if specific_answer_type != MULTIPLE_SPAN or self.multispan_allow_all_heads_to_answer:
question_span_fields: List[Field] = [SpanField(span[0], span[1], qp_field) for span in valid_question_spans]
if not question_span_fields:
question_span_fields.append(SpanField(-1, -1, qp_field))
fields["answer_as_question_spans"] = ListField(question_span_fields)
add_sub_signs_field: List[Field] = []
extra_signs_field: List[Field] = []
for signs_for_one_add_sub_expressions in valid_expressions:
extra_signs = signs_for_one_add_sub_expressions[:len(self.extra_numbers)]
normal_signs = signs_for_one_add_sub_expressions[len(self.extra_numbers):]
add_sub_signs_field.append(SequenceLabelField(normal_signs, numbers_in_passage_field))
extra_signs_field.append(SequenceLabelField(extra_signs, extra_numbers_field))
if not add_sub_signs_field:
add_sub_signs_field.append(SequenceLabelField([0] * len(number_tokens), numbers_in_passage_field))
if not extra_signs_field:
extra_signs_field.append(SequenceLabelField([0] * len(self.extra_numbers), extra_numbers_field))
fields["answer_as_expressions"] = ListField(add_sub_signs_field)
if self.extra_numbers:
fields["answer_as_expressions_extra"] = ListField(extra_signs_field)
'''
Add unit_field
'''
unit_span_fields: List[Field] = []
unit_span_fields: List[Field] = [SpanField(span[0], span[1], qp_field) for span in valid_unit_spans]
if not unit_span_fields:
unit_span_fields.append(SpanField(-1, -1, qp_field))
fields["answer_as_unit_spans"] = ListField(unit_span_fields)
count_fields: List[Field] = [LabelField(count_label, skip_indexing=True) for count_label in valid_counts]
if not count_fields:
count_fields.append(LabelField(-1, skip_indexing=True))
fields["answer_as_counts"] = ListField(count_fields)
yesno_field: List[Field] = [LabelField(valid_yesno, skip_indexing=True)]
fields["answer_as_yesno"] = ListField(yesno_field)
no_answer_bios = SequenceLabelField([0] * len(qp_tokens), sequence_field=qp_field)
if (specific_answer_type in self.bio_types) and (len(valid_passage_spans) > 0 or len(valid_question_spans) > 0):
# Used for flexible BIO loss
# START
spans_dict = {}
text_to_disjoint_bios: List[ListField] = []
flexibility_count = 1
for tokenized_answer_text in tokenized_answer_texts:
spans = DropReader.find_valid_spans(qp_tokens, [tokenized_answer_text])
if len(spans) == 0:
# possible if the passage was clipped, but not for all of the answers
continue
spans_dict[tokenized_answer_text] = spans
disjoint_bios: List[SequenceLabelField] = []
for span_ind, span in enumerate(spans):
bios = create_bio_labels([span], len(qp_field))
disjoint_bios.append(SequenceLabelField(bios, sequence_field=qp_field))
text_to_disjoint_bios.append(ListField(disjoint_bios))
flexibility_count *= ((2**len(spans)) - 1)
fields["answer_as_text_to_disjoint_bios"] = ListField(text_to_disjoint_bios)
if (flexibility_count < self.flexibility_threshold):
# generate all non-empty span combinations per each text
spans_combinations_dict = {}
for key, spans in spans_dict.items():
spans_combinations_dict[key] = all_combinations = []
for i in range(1, len(spans) + 1):
all_combinations += list(itertools.combinations(spans, i))
# calculate product between all the combinations per each text
packed_gold_spans_list = itertools.product(*list(spans_combinations_dict.values()))
bios_list: List[SequenceLabelField] = []
for packed_gold_spans in packed_gold_spans_list:
gold_spans = [s for sublist in packed_gold_spans for s in sublist]
bios = create_bio_labels(gold_spans, len(qp_field))
bios_list.append(SequenceLabelField(bios, sequence_field=qp_field))
fields["answer_as_list_of_bios"] = ListField(bios_list)
fields["answer_as_text_to_disjoint_bios"] = ListField([ListField([no_answer_bios])])
else:
fields["answer_as_list_of_bios"] = ListField([no_answer_bios])
# END
# Used for both "require-all" BIO loss and flexible loss
bio_labels = create_bio_labels(valid_question_spans + valid_passage_spans, len(qp_field))
fields['span_bio_labels'] = SequenceLabelField(bio_labels, sequence_field=qp_field)
fields["is_bio_mask"] = LabelField(1, skip_indexing=True)
else:
fields["answer_as_text_to_disjoint_bios"] = ListField([ListField([no_answer_bios])])
fields["answer_as_list_of_bios"] = ListField([no_answer_bios])
# create all 'O' BIO labels for non-span questions
fields['span_bio_labels'] = no_answer_bios
fields["is_bio_mask"] = LabelField(0, skip_indexing=True)
fields["metadata"] = MetadataField(metadata)
return Instance(fields)
def augment(self, passage_id, question_id, passage_text, answer_texts):
# Valid for augmentation
if self._augmentation_ratio < 1 and random.uniform(
0, 1) > self._augmentation_ratio:
return []
# Only multi span questions are augmented
if answer_texts is None or len(answer_texts) <= 1:
return []
if passage_id == self._cached_passage_id:
passage_tags = self._cached_passage_tags
reconstructed_passage_text = self._reconstructed_passage_text
else:
passage_tags = self._tagger.predict_json(
{"sentence": passage_text})
passage_tags['idxs'] = []
temp_passage = passage_text
reconstructed_passage_text = ''
absolute_index = 0
for i, word in enumerate(passage_tags['words']):
tag = passage_tags['tags'][i]
relative_index = temp_passage.index(word)
first_part = temp_passage[:relative_index]
second_part = word
reconstructed_passage_text += first_part + second_part
start_idx = absolute_index + relative_index
end_idx = start_idx + len(word) # exclusive
passage_tags['idxs'].append((start_idx, end_idx))
absolute_index = end_idx
temp_passage = temp_passage[relative_index + len(word):]
self._cached_passage_id = passage_id
self._cached_passage_tags = passage_tags
self._reconstructed_passage_text = reconstructed_passage_text
if reconstructed_passage_text != passage_text:
return []
# Don't try augmentation if there are shared words between the answers or repeating words in an answer
words_set = set()
words_count = 0
for answer_text in answer_texts:
words = answer_text.split()
words_set.update(words)
words_count += len(words)
if len(words_set) != words_count:
return []
# Validations
spans = DropReader.find_valid_spans(
[Token(word) for word in passage_tags['words']], answer_texts)
# Validate each answer has a span (tokenizing here is by the tagger so we can't assume our fixes to the data are enough)
for answer_text in answer_texts:
answer_has_tag = False
for span in spans:
span_text = ' '.join(passage_tags['words'][span[0]:span[1] +
1]).lower()
if answer_text.lower() == span_text:
answer_has_tag = True
break
if not answer_has_tag:
return []
# Validate all spans have PER tags and that there is no span with PER immediately before or after to avoid replacement of partial names
for span in spans:
answer_tags = passage_tags['tags'][span[0]:span[1] + 1]
span_length = len(answer_tags)
# if not all(tag.endswith('PER') for tag in answer_tags): # # Should we enforce a proper BILOU tagging sequence?
if not self.is_valid_BILOU(answer_tags):
return []
# Check if we need it
'''if span[0] > 0 and passage_tags['tags'][span[0] - 1].endswith('PER'):
return []
if span[1] < len(passage_tags) - 1 and passage_tags['tags'][span[1] + 1].endswith('PER'):
return []'''
# Heavier stuff, after fast validations
new_passage_text = passage_text
PLACEHOLDER_SYMBOL = "#"
pending_swaps = []
swaps_mapping = [(i + 1) % len(answer_texts)
for i in range(len(answer_texts))]
subs_per_answer_text = [
get_all_subsequences(answer_text.split())
for answer_text in answer_texts
]
for i, answer_text in enumerate(answer_texts):
replacer_answer_index = swaps_mapping[i]
for sub in subs_per_answer_text[i]:
spans_per_sub = DropReader.find_valid_spans(
[Token(word) for word in passage_tags['words']], [sub])
relative_start_idx = answer_text.index(sub)
relative_end_idx = relative_start_idx + len(sub) # exclusive
if (len(spans_per_sub) >
0) and answer_text.index(sub) != 0 and (
relative_end_idx != len(answer_text)):
# We have a span that is from the middle of the answer. Too ambiguous, ignore question
return []
partition = 1
if relative_start_idx == 0 and relative_end_idx == len(
answer_text):
partition = -1
elif relative_start_idx == 0:
partition = 0
for span in spans_per_sub:
answer_tags = passage_tags['tags'][span[0]:span[1] + 1]
# if not all(tag.endswith('PER') for tag in answer_tags): # Should we enforce a proper BILOU tagging sequence?
if not self.is_valid_BILOU(answer_tags):
continue
first_pard_end = passage_tags['idxs'][span[0]][0]
last_part_start = passage_tags['idxs'][span[1]][1]
pending_swaps.append({
'replacer_answer_index': replacer_answer_index,
'partition': partition,
'first_pard_end': first_pard_end,
'last_part_start': last_part_start
})
first_part = new_passage_text[:passage_tags['idxs'][
span[0]][0]]
last_part = new_passage_text[
passage_tags['idxs'][span[1]][1]:]
new_passage_text = first_part + (PLACEHOLDER_SYMBOL) * (
last_part_start - first_pard_end) + last_part
for swap in sorted(pending_swaps,
key=lambda x: x['first_pard_end'],
reverse=True):
replacer_answer_index = swap['replacer_answer_index']
partition = swap['partition']
first_pard_end = swap['first_pard_end']
last_part_start = swap['last_part_start']
replacer_answer = answer_texts[replacer_answer_index]
if partition == -1:
replacer = replacer_answer
else:
answer_parts = replacer_answer.split()
if len(answer_parts) > 1:
replacer = answer_parts[0] if partition == 0 else ' '.join(
answer_parts[1:])
else:
replacer = replacer_answer
first_part = new_passage_text[:first_pard_end]
last_part = new_passage_text[last_part_start:]
new_passage_text = first_part + replacer + last_part
return [new_passage_text]
def clean(self, passage, question, answer, passage_tagging,
question_tagging):
passage_tokens = [Token(w) for w in passage_tagging['words']]
spans = DropReader.find_valid_spans(passage_tokens, answer['spans'])
if not spans:
return None
new_answer_texts = []
cleaned = False
for answer_text in answer['spans']:
if len(answer_text.split()) <= 1:
continue
new_answer_text = answer_text
for span in spans:
span_text = ' '.join(passage_tagging['words'][span[0]:span[1] +
1]).lower()
if answer_text.lower() != span_text:
continue
span_tags = passage_tagging['tags'][span[0]:span[1] + 1]
count_o = sum(tag == 'O' for tag in span_tags)
other_than_o = len(span_tags) - count_o
if count_o == 0 or other_than_o == 0:
break
tags_to_trim = ['O'] if count_o <= other_than_o else [
'ORG', 'LOC', 'PER', 'MISC'
]
# Remove words only from the start and from the end to keep a valid span
span_words = passage_tagging['words'][span[0]:span[1] + 1]
words_count = len(span_words)
remove_from_start = True
remove_from_end = True
for i in range(words_count):
if remove_from_start and all(not span_tags[i].endswith(tag)
for tag in tags_to_trim):
remove_from_start = False
if remove_from_end and all(
not span_tags[words_count - i - 1].endswith(tag)
for tag in tags_to_trim):
remove_from_end = False
if remove_from_start:
del span_words[0]
if remove_from_end:
del span_words[-1]
if not remove_from_end and not remove_from_start:
break
new_answer_text = ' '.join(span_words)
cleaned = True
break
new_answer_texts.append(new_answer_text)
if not cleaned:
return None
new_answer = answer.copy()
new_answer['spans'] = new_answer_texts
return {'answer': new_answer}
