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create_generators.py
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create_generators.py
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import os
import random
import tempfile
from copy import copy
from functools import partial
from multiprocessing import cpu_count
import pickle
import numpy as np
import tensorflow as tf
from joblib import Parallel, delayed
from .tokenization import printable_text
from .utils import (BOS_TOKEN, EOS_TOKEN, add_special_tokens_with_seqs,
create_instances_from_document, create_mask_and_padding,
create_masked_lm_predictions, punc_augument,
tokenize_text_with_seqs, truncate_seq_pair)
def create_single_problem_single_instance(problem,
ex_index,
example,
label_encoder,
params,
tokenizer,
mode,
problem_type,
is_seq):
raw_inputs, raw_target = example
# punctuation augumentation
if params.punc_replace_prob > 0 and mode == 'train':
raw_inputs = punc_augument(raw_inputs, params)
# tokenize inputs, now the length is fixed, target == raw_target
if isinstance(raw_inputs, dict):
tokens_a, target = tokenize_text_with_seqs(
tokenizer, raw_inputs['a'], raw_target, is_seq)
tokens_b, _ = tokenize_text_with_seqs(
tokenizer, raw_inputs['b'], raw_target)
else:
tokens_a, target = tokenize_text_with_seqs(
tokenizer, raw_inputs, raw_target, is_seq)
tokens_b = None
if tokens_b is not None and is_seq:
raise NotImplementedError(
'Sequence Labeling with tokens b is not implemented')
if not tokens_a:
return
# check whether tokenization changed the length
if is_seq:
if len(target) != len(tokens_a):
tf.logging.warning('Data %d broken' % ex_index)
return
# truncate tokens and target to max_seq_len
tokens_a, tokens_b, target = truncate_seq_pair(
tokens_a, tokens_b, target, params.max_seq_len, is_seq=is_seq)
# add [SEP], [CLS] tokens
tokens, segment_ids, target = add_special_tokens_with_seqs(
tokens_a, tokens_b, target, is_seq)
# train mask lm as augument task while training
if params.augument_mask_lm and mode == 'train':
rng = random.Random()
(mask_lm_tokens, masked_lm_positions,
masked_lm_labels) = create_masked_lm_predictions(
tokens,
params.masked_lm_prob,
params.max_predictions_per_seq,
list(tokenizer.vocab.keys()), rng)
_, mask_lm_tokens, _, _ = create_mask_and_padding(
mask_lm_tokens,
copy(segment_ids),
copy(target),
params.max_seq_len,
is_seq,
dynamic_padding=params.dynamic_padding)
masked_lm_weights, masked_lm_labels, masked_lm_positions, _ = create_mask_and_padding(
masked_lm_labels, masked_lm_positions, None, params.max_predictions_per_seq)
mask_lm_input_ids = tokenizer.convert_tokens_to_ids(
mask_lm_tokens)
masked_lm_ids = tokenizer.convert_tokens_to_ids(masked_lm_labels)
input_mask, tokens, segment_ids, target = create_mask_and_padding(
tokens, segment_ids, target, params.max_seq_len, is_seq, dynamic_padding=params.dynamic_padding)
# create mask and padding for labels of seq2seq problem
if problem_type in ['seq2seq_tag', 'seq2seq_text']:
# tokenize text if target is text
if problem_type == 'seq2seq_text':
# assign num_classes for text generation problem
params.num_classes[problem] = len(label_encoder.vocab)
target, _ = tokenize_text_with_seqs(
label_encoder, target, None, False)
target, _, _ = truncate_seq_pair(
target, None, None, params.decode_max_seq_len, is_seq=is_seq)
# since we initialize the id to 0 in prediction, we need
# to make sure that BOS_TOKEN is [PAD]
target = [BOS_TOKEN] + target + [EOS_TOKEN]
label_mask, target, _, _ = create_mask_and_padding(
target, [0] * len(target), None, params.decode_max_seq_len)
input_ids = tokenizer.convert_tokens_to_ids(tokens)
if isinstance(target, list):
if problem_type == 'seq2seq_text':
label_id = label_encoder.convert_tokens_to_ids(target)
elif problem_type == 'multi_cls':
label_id = label_encoder.transform([target])[0]
else:
# seq2seq_tag
label_id = label_encoder.transform(target).tolist()
label_id = [np.int32(i) for i in label_id]
else:
label_id = label_encoder.transform([target]).tolist()[0]
label_id = np.int32(label_id)
if not params.dynamic_padding:
assert len(input_ids) == params.max_seq_len
assert len(input_mask) == params.max_seq_len
assert len(segment_ids) == params.max_seq_len, segment_ids
if is_seq:
assert len(label_id) == params.max_seq_len
# logging in debug mode
if ex_index < 5:
tf.logging.debug("*** Example ***")
tf.logging.debug("tokens: %s" % " ".join(
[printable_text(x) for x in tokens]))
tf.logging.debug("input_ids: %s" %
" ".join([str(x) for x in input_ids]))
tf.logging.debug("input_mask: %s" %
" ".join([str(x) for x in input_mask]))
tf.logging.debug("segment_ids: %s" %
" ".join([str(x) for x in segment_ids]))
if is_seq or problem_type in ['seq2seq_tag', 'seq2seq_text']:
tf.logging.debug("%s_label_ids: %s" %
(problem, " ".join([str(x) for x in label_id])))
tf.logging.debug("%s_label: %s" %
(problem, " ".join([str(x) for x in target])))
else:
tf.logging.debug("%s_label_ids: %s" %
(problem, str(label_id)))
tf.logging.debug("%s_label: %s" %
(problem, str(target)))
if params.augument_mask_lm and mode == 'train':
tf.logging.debug("mask lm tokens: %s" % " ".join(
[printable_text(x) for x in mask_lm_tokens]))
tf.logging.debug("mask lm input_ids: %s" %
" ".join([str(x) for x in mask_lm_input_ids]))
tf.logging.debug("mask lm label ids: %s" %
" ".join([str(x) for x in masked_lm_ids]))
tf.logging.debug("mask lm position: %s" %
" ".join([str(x) for x in masked_lm_positions]))
# create return dict
if not params.augument_mask_lm:
return_dict = {
'input_ids': input_ids,
'input_mask': input_mask,
'segment_ids': segment_ids,
'%s_label_ids' % problem: label_id
}
else:
if mode == 'train' and random.uniform(0, 1) <= params.augument_rate:
return_dict = {
'input_ids': mask_lm_input_ids,
'input_mask': input_mask,
'segment_ids': segment_ids,
'%s_label_ids' % problem: label_id,
"masked_lm_positions": masked_lm_positions,
"masked_lm_ids": masked_lm_ids,
"masked_lm_weights": masked_lm_weights,
}
else:
return_dict = {
'input_ids': input_ids,
'input_mask': input_mask,
'segment_ids': segment_ids,
'%s_label_ids' % problem: label_id,
"masked_lm_positions": np.zeros([params.max_predictions_per_seq]),
"masked_lm_ids": np.zeros([params.max_predictions_per_seq]),
"masked_lm_weights": np.zeros([params.max_predictions_per_seq]),
}
if problem_type in ['seq2seq_tag', 'seq2seq_text']:
return_dict['%s_mask' % problem] = label_mask
return return_dict
def _multiprocessing_wrapper(
problem,
example_list,
label_encoder,
params,
tokenizer,
mode,
problem_type,
is_seq):
return_list = []
for ex_index, example in enumerate(example_list):
return_list.append(create_single_problem_single_instance(
problem,
999,
example,
label_encoder,
params,
tokenizer,
mode,
problem_type,
is_seq))
return return_list
def create_single_problem_generator(problem,
inputs_list,
target_list,
label_encoder,
params,
tokenizer,
mode):
"""Function to create iterator for single problem
This function will:
1. Do some text cleaning using original bert tokenizer, if
problem type is sequential tagging, corresponding labels
will be removed.
Example:
Before: inputs: ['a', '&', 'c'] target: [0, 0, 1]
After: inputs: ['a', 'c'] target: [0, 1]
2. Add [CLS], [SEP] tokens
3. Padding
4. yield result dict
Arguments:
problem {str} -- problem name
inputs_list {list } -- inputs list
target_list {list} -- target list, should have the same length as inputs list
label_encoder {LabelEncoder} -- label encoder
params {Params} -- params
tokenizer {tokenizer} -- Bert Tokenizer
epoch {int} -- Deprecate
"""
problem_type = params.problem_type[problem]
# whether this problem is sequential labeling
# for sequential labeling, targets needs to align with any
# change of inputs
is_seq = problem_type in ['seq_tag']
if not params.multiprocess:
for ex_index, example in enumerate(zip(inputs_list, target_list)):
return_dict = create_single_problem_single_instance(problem,
ex_index,
example,
label_encoder,
params,
tokenizer,
mode,
problem_type,
is_seq)
yield return_dict
else:
return_dict_list = []
pickle_file = os.path.join(
params.tmp_file_dir, '{0}_{1}_data.pkl'.format(problem, mode))
if not os.path.exists(pickle_file):
# params.tmp_file_dir = tempfile.mkdtemp(dir='.')
os.makedirs('tmp', exist_ok=True)
params.tmp_file_dir = 'tmp'
pickle_file = os.path.join(
params.tmp_file_dir, '{0}_{1}_data.pkl'.format(problem, mode))
tf.logging.info(
'Saving preprocessing files to {0}'.format(pickle_file))
partial_fn = partial(_multiprocessing_wrapper, problem=problem, label_encoder=label_encoder,
params=params, tokenizer=tokenizer,
mode=mode, problem_type=problem_type, is_seq=is_seq)
example_list = list(zip(inputs_list, target_list))
num_process = cpu_count()
def split(a, n):
k, m = divmod(len(a), n)
return (a[i * k + min(i, m):(i + 1) * k + min(i + 1, m)] for i in range(n))
example_list = list(split(example_list, num_process))
return_dict_list_list = Parallel(num_process)(delayed(partial_fn)(
example_list=example) for example in example_list
)
pickle.dump(return_dict_list_list, open(pickle_file, 'wb'))
else:
return_dict_list_list = pickle.load(open(pickle_file, 'rb'))
for return_dict_list in return_dict_list_list:
for return_dict in return_dict_list:
yield return_dict
def create_pretraining_generator(problem,
inputs_list,
target_list,
label_encoder,
params,
tokenizer
):
"""Slight modification of original code
Raises:
ValueError -- Input format not right
"""
if not isinstance(inputs_list[0][0], list):
raise ValueError('inputs is expected to be list of list of list.')
all_documents = []
for document in inputs_list:
all_documents.append([])
for sentence in document:
all_documents[-1].append(tokenizer.tokenize('\t'.join(sentence)))
all_documents = [d for d in all_documents if d]
rng = random.Random()
rng.shuffle(all_documents)
vocab_words = list(tokenizer.vocab.keys())
instances = []
print_count = 0
for _ in range(params.dupe_factor):
for document_index in range(len(all_documents)):
instances = create_instances_from_document(
all_documents,
document_index,
params.max_seq_len,
params.short_seq_prob,
params.masked_lm_prob,
params.max_predictions_per_seq,
vocab_words, rng)
for instance in instances:
tokens = instance.tokens
segment_ids = list(instance.segment_ids)
input_mask, tokens, segment_ids, _ = create_mask_and_padding(
tokens, segment_ids, None, params.max_seq_len)
masked_lm_positions = list(instance.masked_lm_positions)
masked_lm_weights, masked_lm_labels, masked_lm_positions, _ = create_mask_and_padding(
instance.masked_lm_labels, masked_lm_positions, None, params.max_predictions_per_seq)
input_ids = tokenizer.convert_tokens_to_ids(tokens)
masked_lm_ids = tokenizer.convert_tokens_to_ids(
masked_lm_labels)
next_sentence_label = 1 if instance.is_random_next else 0
yield_dict = {
"input_ids": input_ids,
"input_mask": input_mask,
"segment_ids": segment_ids,
"masked_lm_positions": masked_lm_positions,
"masked_lm_ids": masked_lm_ids,
"masked_lm_weights": masked_lm_weights,
"next_sentence_label_ids": next_sentence_label
}
if print_count < 3:
tf.logging.debug('%s : %s' %
('tokens', ' '.join([str(x) for x in tokens])))
for k, v in yield_dict.items():
if not isinstance(v, int):
tf.logging.debug('%s : %s' %
(k, ' '.join([str(x) for x in v])))
print_count += 1
yield yield_dict
def create_generator(params, mode):
"""Function to create iterator for multiple problem
This function dose the following things:
1. Create dummy labels for each problems.
2. Initialize all generators
3. Sample a problem to train at this batch. If eval, take turns
4. Create a loss multiplier
5. Tried to generate samples for target problem, if failed, init gen
6. Add dummy label to other problems
Example:
Problem: cws|NER|weibo_ner&weibo_cws
1. Dummy labels: cws_label_ids: [0,0,0] ...
2. Blablabla
3. Sample, say (weibo_ner&weibo_cws)
4. loss multipliers: {'cws_loss_multiplier': 0, ..., 'weibo_ner_loss_multiplier': 1, ...}
...
Arguments:
params {Params} -- params
mode {mode} -- mode
"""
# example
# problem_list: ['NER', 'cws', 'weibo_ner', 'weibo_cws']
# problem_chunk: [['NER'], ['cws'], ['weibo_ner', 'weibo_cws']]
problem_list = []
problem_chunk = []
for problem_dict in params.run_problem_list:
problem_list += list(problem_dict.keys())
problem_chunk.append(list(problem_dict.keys()))
# get dummy labels
def _create_dummpy_label(problem_type, num_classes=None):
if problem_type == 'cls':
return 0
elif problem_type == 'seq_tag':
return [0]*params.max_seq_len
elif problem_type == 'mask_lm':
return [0]*params.max_predictions_per_seq
elif problem_type == 'multi_cls':
return [0]*num_classes
else:
return [0]*params.decode_max_seq_len
dummy_label_dict = {problem+'_label_ids': _create_dummpy_label(
params.problem_type[problem], params.num_classes[problem]) for problem in problem_list if params.problem_type[problem] != 'pretrain'}
dummy_label_dict.update({problem+'_mask': _create_dummpy_label(
params.problem_type[problem]) for problem in problem_list if params.problem_type[problem] in ['seq2seq_tag', 'seq2seq_text']})
pretrain_dummpy_dict = {
"masked_lm_positions": _create_dummpy_label('mask_lm'),
"masked_lm_ids": _create_dummpy_label('mask_lm'),
"masked_lm_weights": _create_dummpy_label('mask_lm'),
"next_sentence_label_ids": _create_dummpy_label('cls'),
"next_sentence_loss_multiplier": 0,
"masked_lm_loss_multiplier": 0}
# init gen
try:
gen_dict = {problem: params.read_data_fn[problem](params, mode)
for problem in problem_list}
except KeyError:
not_exist_problem = [
p for p in problem_list if p not in params.read_data_fn]
raise KeyError(
'The preprocessing function of {0} not found, make sure you called params.add_problem. If you\'re using train_bert_multitask, please make sure you provided problem_type_dict and processing_fn_dict.'.format(not_exist_problem))
while gen_dict:
# sample problem to train
if len(problem_chunk) > 1:
data_num_list = [params.data_num_dict[chunk[0]]
for chunk in problem_chunk]
if params.multitask_balance_type == 'data_balanced':
sample_prob = np.array(data_num_list) / np.sum(data_num_list)
current_problem_chunk_ind = np.random.choice(
list(range(len(problem_chunk))), p=sample_prob)
current_problem_chunk = problem_chunk[current_problem_chunk_ind]
elif params.multitask_balance_type == 'problem_balanced':
sample_prob = np.array(
[1]*len(data_num_list)) / np.sum([1]*len(data_num_list))
current_problem_chunk_ind = np.random.choice(
list(range(len(problem_chunk))), p=sample_prob)
current_problem_chunk = problem_chunk[current_problem_chunk_ind]
else:
current_problem_chunk = problem_chunk[0]
# create loss multiplier
loss_multiplier = {
problem+'_loss_multiplier': 0 for problem in problem_list if params.problem_type[problem] != 'pretrain'}
for problem in current_problem_chunk:
if params.problem_type[problem] != 'pretrain':
loss_multiplier[problem+'_loss_multiplier'] = 1
else:
loss_multiplier['next_sentence_loss_multiplier'] = 1
loss_multiplier['masked_lm_loss_multiplier'] = 1
base_dict = {}
base_input = None
for problem in current_problem_chunk:
try:
instance = next(gen_dict[problem])
except StopIteration:
if mode == 'train':
gen_dict[problem] = params.read_data_fn[problem](
params, mode)
instance = next(gen_dict[problem])
else:
del gen_dict[problem]
continue
except KeyError:
continue
if not instance:
continue
base_dict.update(instance)
if base_input is None:
base_input = instance['input_ids']
elif not params.augument_mask_lm:
assert base_input == instance[
'input_ids'], 'Inputs id of two chained problem not aligned. Please double check!'
if not base_dict:
continue
for problem in problem_list:
problem_type = params.problem_type[problem]
problem_label_name = '{0}_label_ids'.format(problem)
if problem_label_name not in base_dict:
if problem_type == 'seq_tag':
base_dict[problem_label_name] = dummy_label_dict[problem_label_name][:len(
base_dict['input_ids'])]
elif problem_type == 'pretrain':
if 'masked_lm_ids' not in base_dict:
base_dict.update(pretrain_dummpy_dict)
else:
base_dict[problem_label_name] = dummy_label_dict[problem_label_name]
if problem_type in ['seq2seq_tag', 'seq2seq_text']:
base_dict['{0}_mask'.format(
problem)] = dummy_label_dict['{0}_mask'.format(problem)]
# add loss multipliers
base_dict.update(loss_multiplier)
yield base_dict