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eval_utils.py
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eval_utils.py
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# coding=utf-8
# Copyright 2018 The Google AI Language Team Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Utility function for nq evaluation."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import collections
import glob
from gzip import GzipFile
import json
import multiprocessing
from absl import flags
from absl import logging
flags.DEFINE_integer(
'long_non_null_threshold', 2,
'Require this many non-null long answer annotations '
'to count gold as containing a long answer.')
flags.DEFINE_integer(
'short_non_null_threshold', 2,
'Require this many non-null short answer annotations '
'to count gold as containing a short answer.')
FLAGS = flags.FLAGS
# A data structure for storing prediction and annotation.
# When a example has multiple annotations, multiple NQLabel will be used.
NQLabel = collections.namedtuple(
'NQLabel',
[
'example_id', # the unique id for each NQ example.
'long_answer_span', # A Span object for long answer.
'short_answer_span_list', # A list of Spans for short answer.
# Note that In NQ, the short answers
# do not need to be in a single span.
'yes_no_answer', # Indicate if the short answer is an yes/no answer
# The possible values are "yes", "no", "none".
# (case insensitive)
# If the field is "yes", short_answer_span_list
# should be empty or only contain null spans.
'long_score', # The prediction score for the long answer prediction.
'short_score' # The prediction score for the short answer prediction.
])
class Span(object):
"""A class for handling token and byte spans.
The logic is:
1) if both start_byte != -1 and end_byte != -1 then the span is defined
by byte offsets
2) else, if start_token != -1 and end_token != -1 then the span is define
by token offsets
3) else, this is a null span.
Null spans means that there is no (long or short) answers.
If your systems only care about token spans rather than byte spans, set all
byte spans to -1.
"""
def __init__(self, start_byte, end_byte, start_token_idx, end_token_idx):
if ((start_byte < 0 and end_byte >= 0) or
(start_byte >= 0 and end_byte < 0)):
raise ValueError('Inconsistent Null Spans (Byte).')
if ((start_token_idx < 0 and end_token_idx >= 0) or
(start_token_idx >= 0 and end_token_idx < 0)):
raise ValueError('Inconsistent Null Spans (Token).')
if start_byte >= 0 and end_byte >= 0 and start_byte >= end_byte:
raise ValueError('Invalid byte spans (start_byte >= end_byte).')
if ((start_token_idx >= 0 and end_token_idx >= 0) and
(start_token_idx >= end_token_idx)):
raise ValueError('Invalid token spans (start_token_idx >= end_token_idx)')
self.start_byte = start_byte
self.end_byte = end_byte
self.start_token_idx = start_token_idx
self.end_token_idx = end_token_idx
def is_null_span(self):
"""A span is a null span if the start and end are both -1."""
if (self.start_byte < 0 and self.end_byte < 0 and
self.start_token_idx < 0 and self.end_token_idx < 0):
return True
return False
def __str__(self):
byte_str = 'byte: [' + str(self.start_byte) + ',' + str(self.end_byte) + ')'
tok_str = ('tok: [' + str(self.start_token_idx) + ',' +
str(self.end_token_idx) + ')')
return byte_str + ' ' + tok_str
def __repr__(self):
return self.__str__()
def is_null_span_list(span_list):
"""Returns true iff all spans in span_list are null or span_list is empty."""
if not span_list or all([span.is_null_span() for span in span_list]):
return True
return False
def nonnull_span_equal(span_a, span_b):
"""Given two spans, return if they are equal.
Args:
span_a: a Span object.
span_b: a Span object. Only compare non-null spans. First, if the bytes are
not negative, compare byte offsets, Otherwise, compare token offsets.
Returns:
True or False
"""
assert isinstance(span_a, Span)
assert isinstance(span_b, Span)
assert not span_a.is_null_span()
assert not span_b.is_null_span()
# if byte offsets are not negative, compare byte offsets
if ((span_a.start_byte >= 0 and span_a.end_byte >= 0) and
(span_b.start_byte >= 0 and span_b.end_byte >= 0)):
if ((span_a.start_byte == span_b.start_byte) and
(span_a.end_byte == span_b.end_byte)):
return True
# if token offsets are not negative, compare token offsets
if ((span_a.start_token_idx >= 0 and span_a.end_token_idx >= 0) and
(span_b.start_token_idx >= 0 and span_b.end_token_idx >= 0)):
if ((span_a.start_token_idx == span_b.start_token_idx) and
(span_a.end_token_idx == span_b.end_token_idx)):
return True
return False
def span_set_equal(gold_span_list, pred_span_list):
"""Make the spans are completely equal besides null spans."""
gold_span_list = [span for span in gold_span_list if not span.is_null_span()]
pred_span_list = [span for span in pred_span_list if not span.is_null_span()]
for pspan in pred_span_list:
# not finding pspan equal to any spans in gold_span_list
if not any([nonnull_span_equal(pspan, gspan) for gspan in gold_span_list]):
return False
for gspan in gold_span_list:
# not finding gspan equal to any spans in pred_span_list
if not any([nonnull_span_equal(pspan, gspan) for pspan in pred_span_list]):
return False
return True
def gold_has_short_answer(gold_label_list):
"""Gets vote from multi-annotators for judging if there is a short answer."""
# We consider if there is a short answer if there is an short answer span or
# the yes/no answer is not none.
gold_has_answer = gold_label_list and sum([
((not is_null_span_list(label.short_answer_span_list)) or
(label.yes_no_answer != 'none')) for label in gold_label_list
]) >= FLAGS.short_non_null_threshold
return gold_has_answer
def gold_has_long_answer(gold_label_list):
"""Gets vote from multi-annotators for judging if there is a long answer."""
gold_has_answer = gold_label_list and (sum([
not label.long_answer_span.is_null_span() # long answer not null
for label in gold_label_list # for each annotator
]) >= FLAGS.long_non_null_threshold)
return gold_has_answer
def read_prediction_json(predictions_path):
"""Read the prediction json with scores.
Args:
predictions_path: the path for the prediction json.
Returns:
A dictionary with key = example_id, value = NQInstancePrediction.
"""
logging.info('Reading predictions from file: %s', format(predictions_path))
with open(predictions_path, 'r') as f:
predictions = json.loads(f.read())
nq_pred_dict = {}
for single_prediction in predictions['predictions']:
if 'long_answer' in single_prediction:
long_span = Span(single_prediction['long_answer']['start_byte'],
single_prediction['long_answer']['end_byte'],
single_prediction['long_answer']['start_token'],
single_prediction['long_answer']['end_token'])
else:
long_span = Span(-1, -1, -1, -1) # Span is null if not presented.
short_span_list = []
if 'short_answers' in single_prediction:
for short_item in single_prediction['short_answers']:
short_span_list.append(
Span(short_item['start_byte'], short_item['end_byte'],
short_item['start_token'], short_item['end_token']))
yes_no_answer = 'none'
if 'yes_no_answer' in single_prediction:
yes_no_answer = single_prediction['yes_no_answer'].lower()
if yes_no_answer not in ['yes', 'no', 'none']:
raise ValueError('Invalid yes_no_answer value in prediction')
if yes_no_answer != 'none' and not is_null_span_list(short_span_list):
raise ValueError('yes/no prediction and short answers cannot coexist.')
pred_item = NQLabel(
example_id=single_prediction['example_id'],
long_answer_span=long_span,
short_answer_span_list=short_span_list,
yes_no_answer=yes_no_answer,
long_score=single_prediction['long_answer_score'],
short_score=single_prediction['short_answers_score'])
nq_pred_dict[single_prediction['example_id']] = pred_item
return nq_pred_dict
def read_annotation_from_one_split(gzipped_input_file):
"""Read annotation from one split of file."""
if isinstance(gzipped_input_file, str):
gzipped_input_file = open(gzipped_input_file, 'rb')
logging.info('parsing %s ..... ', gzipped_input_file.name)
annotation_dict = {}
with GzipFile(fileobj=gzipped_input_file) as input_file:
for line in input_file:
json_example = json.loads(line)
example_id = json_example['example_id']
# There are multiple annotations for one nq example.
annotation_list = []
for annotation in json_example['annotations']:
long_span_rec = annotation['long_answer']
long_span = Span(long_span_rec['start_byte'], long_span_rec['end_byte'],
long_span_rec['start_token'],
long_span_rec['end_token'])
short_span_list = []
for short_span_rec in annotation['short_answers']:
short_span = Span(short_span_rec['start_byte'],
short_span_rec['end_byte'],
short_span_rec['start_token'],
short_span_rec['end_token'])
short_span_list.append(short_span)
gold_label = NQLabel(
example_id=example_id,
long_answer_span=long_span,
short_answer_span_list=short_span_list,
long_score=0,
short_score=0,
yes_no_answer=annotation['yes_no_answer'].lower())
annotation_list.append(gold_label)
annotation_dict[example_id] = annotation_list
return annotation_dict
def read_annotation(path_name, n_threads=10):
"""Read annotations with real multiple processes."""
input_paths = glob.glob(path_name)
pool = multiprocessing.Pool(n_threads)
try:
dict_list = pool.map(read_annotation_from_one_split, input_paths)
finally:
pool.close()
pool.join()
final_dict = {}
for single_dict in dict_list:
final_dict.update(single_dict)
return final_dict