diff --git a/examples/run_squad.py b/examples/run_squad.py index 68b2e49bf9..c80fa32e52 100644 --- a/examples/run_squad.py +++ b/examples/run_squad.py @@ -46,7 +46,10 @@ logger = logging.getLogger(__name__) class SquadExample(object): - """A single training/test example for the Squad dataset.""" + """ + A single training/test example for the Squad dataset. + For examples without an answer, the start and end position are -1. + """ def __init__(self, qas_id, @@ -54,13 +57,15 @@ class SquadExample(object): doc_tokens, orig_answer_text=None, start_position=None, - end_position=None): + end_position=None, + is_impossible=None): self.qas_id = qas_id self.question_text = question_text self.doc_tokens = doc_tokens self.orig_answer_text = orig_answer_text self.start_position = start_position self.end_position = end_position + self.is_impossible = is_impossible def __str__(self): return self.__repr__() @@ -75,6 +80,8 @@ class SquadExample(object): s += ", start_position: %d" % (self.start_position) if self.start_position: s += ", end_position: %d" % (self.end_position) + if self.start_position: + s += ", is_impossible: %r" % (self.is_impossible) return s @@ -92,7 +99,8 @@ class InputFeatures(object): input_mask, segment_ids, start_position=None, - end_position=None): + end_position=None, + is_impossible=None): self.unique_id = unique_id self.example_index = example_index self.doc_span_index = doc_span_index @@ -104,9 +112,10 @@ class InputFeatures(object): self.segment_ids = segment_ids self.start_position = start_position self.end_position = end_position + self.is_impossible = is_impossible -def read_squad_examples(input_file, is_training): +def read_squad_examples(input_file, is_training, version_2_with_negative): """Read a SQuAD json file into a list of SquadExample.""" with open(input_file, "r", encoding='utf-8') as reader: input_data = json.load(reader)["data"] @@ -140,29 +149,37 @@ def read_squad_examples(input_file, is_training): start_position = None end_position = None orig_answer_text = None + is_impossible = False if is_training: - if len(qa["answers"]) != 1: + if version_2_with_negative: + is_impossible = qa["is_impossible"] + if (len(qa["answers"]) != 1) and (not is_impossible): raise ValueError( "For training, each question should have exactly 1 answer.") - answer = qa["answers"][0] - orig_answer_text = answer["text"] - answer_offset = answer["answer_start"] - answer_length = len(orig_answer_text) - start_position = char_to_word_offset[answer_offset] - end_position = char_to_word_offset[answer_offset + answer_length - 1] - # Only add answers where the text can be exactly recovered from the - # document. If this CAN'T happen it's likely due to weird Unicode - # stuff so we will just skip the example. - # - # Note that this means for training mode, every example is NOT - # guaranteed to be preserved. - actual_text = " ".join(doc_tokens[start_position:(end_position + 1)]) - cleaned_answer_text = " ".join( - whitespace_tokenize(orig_answer_text)) - if actual_text.find(cleaned_answer_text) == -1: - logger.warning("Could not find answer: '%s' vs. '%s'", + if not is_impossible: + answer = qa["answers"][0] + orig_answer_text = answer["text"] + answer_offset = answer["answer_start"] + answer_length = len(orig_answer_text) + start_position = char_to_word_offset[answer_offset] + end_position = char_to_word_offset[answer_offset + answer_length - 1] + # Only add answers where the text can be exactly recovered from the + # document. If this CAN'T happen it's likely due to weird Unicode + # stuff so we will just skip the example. + # + # Note that this means for training mode, every example is NOT + # guaranteed to be preserved. + actual_text = " ".join(doc_tokens[start_position:(end_position + 1)]) + cleaned_answer_text = " ".join( + whitespace_tokenize(orig_answer_text)) + if actual_text.find(cleaned_answer_text) == -1: + logger.warning("Could not find answer: '%s' vs. '%s'", actual_text, cleaned_answer_text) - continue + continue + else: + start_position = -1 + end_position = -1 + orig_answer_text = "" example = SquadExample( qas_id=qas_id, @@ -170,7 +187,8 @@ def read_squad_examples(input_file, is_training): doc_tokens=doc_tokens, orig_answer_text=orig_answer_text, start_position=start_position, - end_position=end_position) + end_position=end_position, + is_impossible=is_impossible) examples.append(example) return examples @@ -200,7 +218,10 @@ def convert_examples_to_features(examples, tokenizer, max_seq_length, tok_start_position = None tok_end_position = None - if is_training: + if is_training and example.is_impossible: + tok_start_position = -1 + tok_end_position = -1 + if is_training and not example.is_impossible: tok_start_position = orig_to_tok_index[example.start_position] if example.end_position < len(example.doc_tokens) - 1: tok_end_position = orig_to_tok_index[example.end_position + 1] - 1 @@ -272,20 +293,25 @@ def convert_examples_to_features(examples, tokenizer, max_seq_length, start_position = None end_position = None - if is_training: + if is_training and not example.is_impossible: # For training, if our document chunk does not contain an annotation # we throw it out, since there is nothing to predict. doc_start = doc_span.start doc_end = doc_span.start + doc_span.length - 1 - if (example.start_position < doc_start or - example.end_position < doc_start or - example.start_position > doc_end or example.end_position > doc_end): - continue - - doc_offset = len(query_tokens) + 2 - start_position = tok_start_position - doc_start + doc_offset - end_position = tok_end_position - doc_start + doc_offset - + out_of_span = False + if not (tok_start_position >= doc_start and + tok_end_position <= doc_end): + out_of_span = True + if out_of_span: + start_position = 0 + end_position = 0 + else: + doc_offset = len(query_tokens) + 2 + start_position = tok_start_position - doc_start + doc_offset + end_position = tok_end_position - doc_start + doc_offset + if is_training and example.is_impossible: + start_position = 0 + end_position = 0 if example_index < 20: logger.info("*** Example ***") logger.info("unique_id: %s" % (unique_id)) @@ -302,7 +328,9 @@ def convert_examples_to_features(examples, tokenizer, max_seq_length, "input_mask: %s" % " ".join([str(x) for x in input_mask])) logger.info( "segment_ids: %s" % " ".join([str(x) for x in segment_ids])) - if is_training: + if is_training and example.is_impossible: + logger.info("impossible example") + if is_training and not example.is_impossible: answer_text = " ".join(tokens[start_position:(end_position + 1)]) logger.info("start_position: %d" % (start_position)) logger.info("end_position: %d" % (end_position)) @@ -321,7 +349,8 @@ def convert_examples_to_features(examples, tokenizer, max_seq_length, input_mask=input_mask, segment_ids=segment_ids, start_position=start_position, - end_position=end_position)) + end_position=end_position, + is_impossible=example.is_impossible)) unique_id += 1 return features @@ -401,15 +430,15 @@ def _check_is_max_context(doc_spans, cur_span_index, position): return cur_span_index == best_span_index - RawResult = collections.namedtuple("RawResult", ["unique_id", "start_logits", "end_logits"]) def write_predictions(all_examples, all_features, all_results, n_best_size, max_answer_length, do_lower_case, output_prediction_file, - output_nbest_file, verbose_logging): - """Write final predictions to the json file.""" + output_nbest_file, output_null_log_odds_file, verbose_logging, + version_2_with_negative, null_score_diff_threshold): + """Write final predictions to the json file and log-odds of null if needed.""" logger.info("Writing predictions to: %s" % (output_prediction_file)) logger.info("Writing nbest to: %s" % (output_nbest_file)) @@ -427,15 +456,29 @@ def write_predictions(all_examples, all_features, all_results, n_best_size, all_predictions = collections.OrderedDict() all_nbest_json = collections.OrderedDict() + scores_diff_json = collections.OrderedDict() + for (example_index, example) in enumerate(all_examples): features = example_index_to_features[example_index] prelim_predictions = [] + # keep track of the minimum score of null start+end of position 0 + score_null = 1000000 # large and positive + min_null_feature_index = 0 # the paragraph slice with min mull score + null_start_logit = 0 # the start logit at the slice with min null score + null_end_logit = 0 # the end logit at the slice with min null score for (feature_index, feature) in enumerate(features): result = unique_id_to_result[feature.unique_id] - start_indexes = _get_best_indexes(result.start_logits, n_best_size) end_indexes = _get_best_indexes(result.end_logits, n_best_size) + # if we could have irrelevant answers, get the min score of irrelevant + if version_2_with_negative: + feature_null_score = result.start_logits[0] + result.end_logits[0] + if feature_null_score < score_null: + score_null = feature_null_score + min_null_feature_index = feature_index + null_start_logit = result.start_logits[0] + null_end_logit = result.end_logits[0] for start_index in start_indexes: for end_index in end_indexes: # We could hypothetically create invalid predictions, e.g., predict @@ -463,7 +506,14 @@ def write_predictions(all_examples, all_features, all_results, n_best_size, end_index=end_index, start_logit=result.start_logits[start_index], end_logit=result.end_logits[end_index])) - + if version_2_with_negative: + prelim_predictions.append( + _PrelimPrediction( + feature_index=min_null_feature_index, + start_index=0, + end_index=0, + start_logit=null_start_logit, + end_logit=null_end_logit)) prelim_predictions = sorted( prelim_predictions, key=lambda x: (x.start_logit + x.end_logit), @@ -478,33 +528,44 @@ def write_predictions(all_examples, all_features, all_results, n_best_size, if len(nbest) >= n_best_size: break feature = features[pred.feature_index] + if pred.start_index > 0: # this is a non-null prediction + tok_tokens = feature.tokens[pred.start_index:(pred.end_index + 1)] + orig_doc_start = feature.token_to_orig_map[pred.start_index] + orig_doc_end = feature.token_to_orig_map[pred.end_index] + orig_tokens = example.doc_tokens[orig_doc_start:(orig_doc_end + 1)] + tok_text = " ".join(tok_tokens) - tok_tokens = feature.tokens[pred.start_index:(pred.end_index + 1)] - orig_doc_start = feature.token_to_orig_map[pred.start_index] - orig_doc_end = feature.token_to_orig_map[pred.end_index] - orig_tokens = example.doc_tokens[orig_doc_start:(orig_doc_end + 1)] - tok_text = " ".join(tok_tokens) + # De-tokenize WordPieces that have been split off. + tok_text = tok_text.replace(" ##", "") + tok_text = tok_text.replace("##", "") - # De-tokenize WordPieces that have been split off. - tok_text = tok_text.replace(" ##", "") - tok_text = tok_text.replace("##", "") + # Clean whitespace + tok_text = tok_text.strip() + tok_text = " ".join(tok_text.split()) + orig_text = " ".join(orig_tokens) - # Clean whitespace - tok_text = tok_text.strip() - tok_text = " ".join(tok_text.split()) - orig_text = " ".join(orig_tokens) + final_text = get_final_text(tok_text, orig_text, do_lower_case, verbose_logging) + if final_text in seen_predictions: + continue - final_text = get_final_text(tok_text, orig_text, do_lower_case, verbose_logging) - if final_text in seen_predictions: - continue + seen_predictions[final_text] = True + else: + final_text = "" + seen_predictions[final_text] = True - seen_predictions[final_text] = True nbest.append( _NbestPrediction( text=final_text, start_logit=pred.start_logit, end_logit=pred.end_logit)) - + # if we didn't include the empty option in the n-best, include it + if version_2_with_negative: + if "" not in seen_predictions: + nbest.append( + _NbestPrediction( + text="", + start_logit=null_start_logit, + end_logit=null_end_logit)) # In very rare edge cases we could have no valid predictions. So we # just create a nonce prediction in this case to avoid failure. if not nbest: @@ -514,8 +575,12 @@ def write_predictions(all_examples, all_features, all_results, n_best_size, assert len(nbest) >= 1 total_scores = [] + best_non_null_entry = None for entry in nbest: total_scores.append(entry.start_logit + entry.end_logit) + if not best_non_null_entry: + if entry.text: + best_non_null_entry = entry probs = _compute_softmax(total_scores) @@ -530,8 +595,18 @@ def write_predictions(all_examples, all_features, all_results, n_best_size, assert len(nbest_json) >= 1 - all_predictions[example.qas_id] = nbest_json[0]["text"] - all_nbest_json[example.qas_id] = nbest_json + if not version_2_with_negative: + all_predictions[example.qas_id] = nbest_json[0]["text"] + else: + # predict "" iff the null score - the score of best non-null > threshold + score_diff = score_null - best_non_null_entry.start_logit - ( + best_non_null_entry.end_logit) + scores_diff_json[example.qas_id] = score_diff + if score_diff > null_score_diff_threshold: + all_predictions[example.qas_id] = "" + else: + all_predictions[example.qas_id] = best_non_null_entry.text + all_nbest_json[example.qas_id] = nbest_json with open(output_prediction_file, "w") as writer: writer.write(json.dumps(all_predictions, indent=4) + "\n") @@ -539,6 +614,10 @@ def write_predictions(all_examples, all_features, all_results, n_best_size, with open(output_nbest_file, "w") as writer: writer.write(json.dumps(all_nbest_json, indent=4) + "\n") + if version_2_with_negative: + with open(output_null_log_odds_file, "w") as writer: + writer.write(json.dumps(scores_diff_json, indent=4) + "\n") + def get_final_text(pred_text, orig_text, do_lower_case, verbose_logging=False): """Project the tokenized prediction back to the original text.""" @@ -601,7 +680,7 @@ def get_final_text(pred_text, orig_text, do_lower_case, verbose_logging=False): if len(orig_ns_text) != len(tok_ns_text): if verbose_logging: logger.info("Length not equal after stripping spaces: '%s' vs '%s'", - orig_ns_text, tok_ns_text) + orig_ns_text, tok_ns_text) return orig_text # We then project the characters in `pred_text` back to `orig_text` using @@ -701,7 +780,7 @@ def main(): parser.add_argument("--num_train_epochs", default=3.0, type=float, help="Total number of training epochs to perform.") parser.add_argument("--warmup_proportion", default=0.1, type=float, - help="Proportion of training to perform linear learning rate warmup for. E.g., 0.1 = 10% " + help="Proportion of training to perform linear learning rate warmup for. E.g., 0.1 = 10%% " "of training.") parser.add_argument("--n_best_size", default=20, type=int, help="The total number of n-best predictions to generate in the nbest_predictions.json " @@ -738,7 +817,12 @@ def main(): help="Loss scaling to improve fp16 numeric stability. Only used when fp16 set to True.\n" "0 (default value): dynamic loss scaling.\n" "Positive power of 2: static loss scaling value.\n") - + parser.add_argument('--version_2_with_negative', + action='store_true', + help='If true, the SQuAD examples contain some that do not have an answer.') + parser.add_argument('--null_score_diff_threshold', + type=float, default=0.0, + help="If null_score - best_non_null is greater than the threshold predict null.") args = parser.parse_args() if args.local_rank == -1 or args.no_cuda: @@ -787,9 +871,9 @@ def main(): num_train_optimization_steps = None if args.do_train: train_examples = read_squad_examples( - input_file=args.train_file, is_training=True) + input_file=args.train_file, is_training=True, version_2_with_negative=args.version_2_with_negative) num_train_optimization_steps = int( - len(train_examples) / args.train_batch_size / args.gradient_accumulation_steps) * args.num_train_epochs + len(train_dataset) / args.train_batch_size / args.gradient_accumulation_steps) * args.num_train_epochs if args.local_rank != -1: num_train_optimization_steps = num_train_optimization_steps // torch.distributed.get_world_size() @@ -825,7 +909,7 @@ def main(): if args.fp16: try: - from apex.optimizers import FP16_Optimizer + from apex.optimizer import FP16_Optimizer from apex.optimizers import FusedAdam except ImportError: raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use distributed and fp16 training.") @@ -901,7 +985,7 @@ def main(): if (step + 1) % args.gradient_accumulation_steps == 0: if args.fp16: # modify learning rate with special warm up BERT uses - # if args.fp16 is False, BertAdam is used that handles this automatically + # if args.fp16 is False, BertAdam is used and handles this automatically lr_this_step = args.learning_rate * warmup_linear(global_step/num_train_optimization_steps, args.warmup_proportion) for param_group in optimizer.param_groups: param_group['lr'] = lr_this_step @@ -914,7 +998,6 @@ def main(): output_model_file = os.path.join(args.output_dir, "pytorch_model.bin") if args.do_train: torch.save(model_to_save.state_dict(), output_model_file) - # Load a trained model that you have fine-tuned model_state_dict = torch.load(output_model_file) model = BertForQuestionAnswering.from_pretrained(args.bert_model, state_dict=model_state_dict) @@ -925,7 +1008,7 @@ def main(): if args.do_predict and (args.local_rank == -1 or torch.distributed.get_rank() == 0): eval_examples = read_squad_examples( - input_file=args.predict_file, is_training=False) + input_file=args.predict_file, is_training=False, version_2_with_negative=args.version_2_with_negative) eval_features = convert_examples_to_features( examples=eval_examples, tokenizer=tokenizer, @@ -969,10 +1052,12 @@ def main(): end_logits=end_logits)) output_prediction_file = os.path.join(args.output_dir, "predictions.json") output_nbest_file = os.path.join(args.output_dir, "nbest_predictions.json") + output_null_log_odds_file = os.path.join(args.output_dir, "null_odds.json") write_predictions(eval_examples, eval_features, all_results, args.n_best_size, args.max_answer_length, args.do_lower_case, output_prediction_file, - output_nbest_file, args.verbose_logging) + output_nbest_file, output_null_log_odds_file, args.verbose_logging, + args.version_2_with_negative, args.null_score_diff_threshold) if __name__ == "__main__": diff --git a/examples/run_squad2.py b/examples/run_squad2.py deleted file mode 100644 index d49c846773..0000000000 --- a/examples/run_squad2.py +++ /dev/null @@ -1,1071 +0,0 @@ -# coding=utf-8 -# Copyright 2018 The Google AI Language Team Authors and The HugginFace Inc. team. -# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved. -# -# 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. -"""Run BERT on SQuAD 2.0""" - -from __future__ import absolute_import -from __future__ import division -from __future__ import print_function - -import argparse -import collections -import logging -import json -import math -import os -import random -import pickle -from tqdm import tqdm, trange - -import numpy as np -import torch -from torch.utils.data import TensorDataset, DataLoader, RandomSampler, SequentialSampler -from torch.utils.data.distributed import DistributedSampler - -from pytorch_pretrained_bert.tokenization import whitespace_tokenize, BasicTokenizer, BertTokenizer -from pytorch_pretrained_bert.modeling import BertForQuestionAnswering -from pytorch_pretrained_bert.optimization import BertAdam, warmup_linear -from pytorch_pretrained_bert.file_utils import PYTORCH_PRETRAINED_BERT_CACHE - -logging.basicConfig(format = '%(asctime)s - %(levelname)s - %(name)s - %(message)s', - datefmt = '%m/%d/%Y %H:%M:%S', - level = logging.INFO) -logger = logging.getLogger(__name__) - - -class SquadExample(object): - """ - A single training/test example for the Squad dataset. - For examples without an answer, the start and end position are -1. - """ - - def __init__(self, - qas_id, - question_text, - doc_tokens, - orig_answer_text=None, - start_position=None, - end_position=None, - is_impossible=None): - self.qas_id = qas_id - self.question_text = question_text - self.doc_tokens = doc_tokens - self.orig_answer_text = orig_answer_text - self.start_position = start_position - self.end_position = end_position - self.is_impossible = is_impossible - - def __str__(self): - return self.__repr__() - - def __repr__(self): - s = "" - s += "qas_id: %s" % (self.qas_id) - s += ", question_text: %s" % ( - self.question_text) - s += ", doc_tokens: [%s]" % (" ".join(self.doc_tokens)) - if self.start_position: - s += ", start_position: %d" % (self.start_position) - if self.start_position: - s += ", end_position: %d" % (self.end_position) - if self.start_position: - s += ", is_impossible: %r" % (self.is_impossible) - return s - - -class InputFeatures(object): - """A single set of features of data.""" - - def __init__(self, - unique_id, - example_index, - doc_span_index, - tokens, - token_to_orig_map, - token_is_max_context, - input_ids, - input_mask, - segment_ids, - start_position=None, - end_position=None, - is_impossible=None): - self.unique_id = unique_id - self.example_index = example_index - self.doc_span_index = doc_span_index - self.tokens = tokens - self.token_to_orig_map = token_to_orig_map - self.token_is_max_context = token_is_max_context - self.input_ids = input_ids - self.input_mask = input_mask - self.segment_ids = segment_ids - self.start_position = start_position - self.end_position = end_position - self.is_impossible = is_impossible - - -def read_squad_examples(input_file, is_training): - """Read a SQuAD json file into a list of SquadExample.""" - with open(input_file, "r", encoding='utf-8') as reader: - source = json.load(reader) - input_data = source["data"] - version = source["version"] - - def is_whitespace(c): - if c == " " or c == "\t" or c == "\r" or c == "\n" or ord(c) == 0x202F: - return True - return False - - examples = [] - for entry in input_data: - for paragraph in entry["paragraphs"]: - paragraph_text = paragraph["context"] - doc_tokens = [] - char_to_word_offset = [] - prev_is_whitespace = True - for c in paragraph_text: - if is_whitespace(c): - prev_is_whitespace = True - else: - if prev_is_whitespace: - doc_tokens.append(c) - else: - doc_tokens[-1] += c - prev_is_whitespace = False - char_to_word_offset.append(len(doc_tokens) - 1) - - for qa in paragraph["qas"]: - qas_id = qa["id"] - question_text = qa["question"] - start_position = None - end_position = None - orig_answer_text = None - is_impossible = False - if is_training: - if version == "v2.0": - is_impossible = qa["is_impossible"] - if (len(qa["answers"]) != 1) and (not is_impossible): - raise ValueError( - "For training, each question should have exactly 1 answer.") - if not is_impossible: - answer = qa["answers"][0] - orig_answer_text = answer["text"] - answer_offset = answer["answer_start"] - answer_length = len(orig_answer_text) - start_position = char_to_word_offset[answer_offset] - end_position = char_to_word_offset[answer_offset + answer_length - 1] - # Only add answers where the text can be exactly recovered from the - # document. If this CAN'T happen it's likely due to weird Unicode - # stuff so we will just skip the example. - # - # Note that this means for training mode, every example is NOT - # guaranteed to be preserved. - actual_text = " ".join(doc_tokens[start_position:(end_position + 1)]) - cleaned_answer_text = " ".join( - whitespace_tokenize(orig_answer_text)) - if actual_text.find(cleaned_answer_text) == -1: - logger.warning("Could not find answer: '%s' vs. '%s'", - actual_text, cleaned_answer_text) - continue - else: - start_position = -1 - end_position = -1 - orig_answer_text = "" - - example = SquadExample( - qas_id=qas_id, - question_text=question_text, - doc_tokens=doc_tokens, - orig_answer_text=orig_answer_text, - start_position=start_position, - end_position=end_position, - is_impossible=is_impossible) - examples.append(example) - return examples - - -def convert_examples_to_features(examples, tokenizer, max_seq_length, - doc_stride, max_query_length, is_training): - """Loads a data file into a list of `InputBatch`s.""" - - unique_id = 1000000000 - - features = [] - for (example_index, example) in enumerate(examples): - query_tokens = tokenizer.tokenize(example.question_text) - - if len(query_tokens) > max_query_length: - query_tokens = query_tokens[0:max_query_length] - - tok_to_orig_index = [] - orig_to_tok_index = [] - all_doc_tokens = [] - for (i, token) in enumerate(example.doc_tokens): - orig_to_tok_index.append(len(all_doc_tokens)) - sub_tokens = tokenizer.tokenize(token) - for sub_token in sub_tokens: - tok_to_orig_index.append(i) - all_doc_tokens.append(sub_token) - - tok_start_position = None - tok_end_position = None - if is_training and example.is_impossible: - tok_start_position = -1 - tok_end_position = -1 - if is_training and not example.is_impossible: - tok_start_position = orig_to_tok_index[example.start_position] - if example.end_position < len(example.doc_tokens) - 1: - tok_end_position = orig_to_tok_index[example.end_position + 1] - 1 - else: - tok_end_position = len(all_doc_tokens) - 1 - (tok_start_position, tok_end_position) = _improve_answer_span( - all_doc_tokens, tok_start_position, tok_end_position, tokenizer, - example.orig_answer_text) - - # The -3 accounts for [CLS], [SEP] and [SEP] - max_tokens_for_doc = max_seq_length - len(query_tokens) - 3 - - # We can have documents that are longer than the maximum sequence length. - # To deal with this we do a sliding window approach, where we take chunks - # of the up to our max length with a stride of `doc_stride`. - _DocSpan = collections.namedtuple( # pylint: disable=invalid-name - "DocSpan", ["start", "length"]) - doc_spans = [] - start_offset = 0 - while start_offset < len(all_doc_tokens): - length = len(all_doc_tokens) - start_offset - if length > max_tokens_for_doc: - length = max_tokens_for_doc - doc_spans.append(_DocSpan(start=start_offset, length=length)) - if start_offset + length == len(all_doc_tokens): - break - start_offset += min(length, doc_stride) - - for (doc_span_index, doc_span) in enumerate(doc_spans): - tokens = [] - token_to_orig_map = {} - token_is_max_context = {} - segment_ids = [] - tokens.append("[CLS]") - segment_ids.append(0) - for token in query_tokens: - tokens.append(token) - segment_ids.append(0) - tokens.append("[SEP]") - segment_ids.append(0) - - for i in range(doc_span.length): - split_token_index = doc_span.start + i - token_to_orig_map[len(tokens)] = tok_to_orig_index[split_token_index] - - is_max_context = _check_is_max_context(doc_spans, doc_span_index, - split_token_index) - token_is_max_context[len(tokens)] = is_max_context - tokens.append(all_doc_tokens[split_token_index]) - segment_ids.append(1) - tokens.append("[SEP]") - segment_ids.append(1) - - input_ids = tokenizer.convert_tokens_to_ids(tokens) - - # The mask has 1 for real tokens and 0 for padding tokens. Only real - # tokens are attended to. - input_mask = [1] * len(input_ids) - - # Zero-pad up to the sequence length. - while len(input_ids) < max_seq_length: - input_ids.append(0) - input_mask.append(0) - segment_ids.append(0) - - assert len(input_ids) == max_seq_length - assert len(input_mask) == max_seq_length - assert len(segment_ids) == max_seq_length - - start_position = None - end_position = None - if is_training and not example.is_impossible: - # For training, if our document chunk does not contain an annotation - # we throw it out, since there is nothing to predict. - doc_start = doc_span.start - doc_end = doc_span.start + doc_span.length - 1 - out_of_span = False - if (example.start_position < doc_start or - example.end_position < doc_start or - example.start_position > doc_end or example.end_position > doc_end): - out_of_span = True - if out_of_span: - start_position = 0 - end_position = 0 - else: - doc_offset = len(query_tokens) + 2 - start_position = tok_start_position - doc_start + doc_offset - end_position = tok_end_position - doc_start + doc_offset - - if is_training and example.is_impossible: - start_position = 0 - end_position = 0 - - if example_index < 20: - logger.info("*** Example ***") - logger.info("unique_id: %s" % (unique_id)) - logger.info("example_index: %s" % (example_index)) - logger.info("doc_span_index: %s" % (doc_span_index)) - logger.info("tokens: %s" % " ".join(tokens)) - logger.info("token_to_orig_map: %s" % " ".join([ - "%d:%d" % (x, y) for (x, y) in token_to_orig_map.items()])) - logger.info("token_is_max_context: %s" % " ".join([ - "%d:%s" % (x, y) for (x, y) in token_is_max_context.items() - ])) - logger.info("input_ids: %s" % " ".join([str(x) for x in input_ids])) - logger.info( - "input_mask: %s" % " ".join([str(x) for x in input_mask])) - logger.info( - "segment_ids: %s" % " ".join([str(x) for x in segment_ids])) - if is_training and example.is_impossible: - logger.info("impossible example") - if is_training and not example.is_impossible: - answer_text = " ".join(tokens[start_position:(end_position + 1)]) - logger.info("start_position: %d" % (start_position)) - logger.info("end_position: %d" % (end_position)) - logger.info( - "answer: %s" % (answer_text)) - - features.append( - InputFeatures( - unique_id=unique_id, - example_index=example_index, - doc_span_index=doc_span_index, - tokens=tokens, - token_to_orig_map=token_to_orig_map, - token_is_max_context=token_is_max_context, - input_ids=input_ids, - input_mask=input_mask, - segment_ids=segment_ids, - start_position=start_position, - end_position=end_position, - is_impossible=example.is_impossible)) - unique_id += 1 - - return features - - -def _improve_answer_span(doc_tokens, input_start, input_end, tokenizer, - orig_answer_text): - """Returns tokenized answer spans that better match the annotated answer.""" - - # The SQuAD annotations are character based. We first project them to - # whitespace-tokenized words. But then after WordPiece tokenization, we can - # often find a "better match". For example: - # - # Question: What year was John Smith born? - # Context: The leader was John Smith (1895-1943). - # Answer: 1895 - # - # The original whitespace-tokenized answer will be "(1895-1943).". However - # after tokenization, our tokens will be "( 1895 - 1943 ) .". So we can match - # the exact answer, 1895. - # - # However, this is not always possible. Consider the following: - # - # Question: What country is the top exporter of electornics? - # Context: The Japanese electronics industry is the lagest in the world. - # Answer: Japan - # - # In this case, the annotator chose "Japan" as a character sub-span of - # the word "Japanese". Since our WordPiece tokenizer does not split - # "Japanese", we just use "Japanese" as the annotation. This is fairly rare - # in SQuAD, but does happen. - tok_answer_text = " ".join(tokenizer.tokenize(orig_answer_text)) - - for new_start in range(input_start, input_end + 1): - for new_end in range(input_end, new_start - 1, -1): - text_span = " ".join(doc_tokens[new_start:(new_end + 1)]) - if text_span == tok_answer_text: - return (new_start, new_end) - - return (input_start, input_end) - - -def _check_is_max_context(doc_spans, cur_span_index, position): - """Check if this is the 'max context' doc span for the token.""" - - # Because of the sliding window approach taken to scoring documents, a single - # token can appear in multiple documents. E.g. - # Doc: the man went to the store and bought a gallon of milk - # Span A: the man went to the - # Span B: to the store and bought - # Span C: and bought a gallon of - # ... - # - # Now the word 'bought' will have two scores from spans B and C. We only - # want to consider the score with "maximum context", which we define as - # the *minimum* of its left and right context (the *sum* of left and - # right context will always be the same, of course). - # - # In the example the maximum context for 'bought' would be span C since - # it has 1 left context and 3 right context, while span B has 4 left context - # and 0 right context. - best_score = None - best_span_index = None - for (span_index, doc_span) in enumerate(doc_spans): - end = doc_span.start + doc_span.length - 1 - if position < doc_span.start: - continue - if position > end: - continue - num_left_context = position - doc_span.start - num_right_context = end - position - score = min(num_left_context, num_right_context) + 0.01 * doc_span.length - if best_score is None or score > best_score: - best_score = score - best_span_index = span_index - - return cur_span_index == best_span_index - - - -RawResult = collections.namedtuple("RawResult", - ["unique_id", "start_logits", "end_logits"]) - - -def write_predictions(all_examples, all_features, all_results, n_best_size, - max_answer_length, do_lower_case, output_prediction_file, - output_nbest_file, output_null_log_odds_file, verbose_logging, is_version2, null_score_diff_threshold): - """Write final predictions to the json file and log-odds of null if needed.""" - logger.info("Writing predictions to: %s" % (output_prediction_file)) - logger.info("Writing nbest to: %s" % (output_nbest_file)) - - example_index_to_features = collections.defaultdict(list) - for feature in all_features: - example_index_to_features[feature.example_index].append(feature) - - unique_id_to_result = {} - for result in all_results: - unique_id_to_result[result.unique_id] = result - - _PrelimPrediction = collections.namedtuple( # pylint: disable=invalid-name - "PrelimPrediction", - ["feature_index", "start_index", "end_index", "start_logit", "end_logit"]) - - all_predictions = collections.OrderedDict() - all_nbest_json = collections.OrderedDict() - scores_diff_json = collections.OrderedDict() - - for (example_index, example) in enumerate(all_examples): - features = example_index_to_features[example_index] - - prelim_predictions = [] - # keep track of the minimum score of null start+end of position 0 - score_null = 1000000 # large and positive - min_null_feature_index = 0 # the paragraph slice with min mull score - null_start_logit = 0 # the start logit at the slice with min null score - null_end_logit = 0 # the end logit at the slice with min null score - - for (feature_index, feature) in enumerate(features): - result = unique_id_to_result[feature.unique_id] - start_indexes = _get_best_indexes(result.start_logits, n_best_size) - end_indexes = _get_best_indexes(result.end_logits, n_best_size) - # if we could have irrelevant answers, get the min score of irrelevant - if is_version2: - feature_null_score = result.start_logits[0] + result.end_logits[0] - if feature_null_score < score_null: - score_null = feature_null_score - min_null_feature_index = feature_index - null_start_logit = result.start_logits[0] - null_end_logit = result.end_logits[0] - - for start_index in start_indexes: - for end_index in end_indexes: - # We could hypothetically create invalid predictions, e.g., predict - # that the start of the span is in the question. We throw out all - # invalid predictions. - if start_index >= len(feature.tokens): - continue - if end_index >= len(feature.tokens): - continue - if start_index not in feature.token_to_orig_map: - continue - if end_index not in feature.token_to_orig_map: - continue - if not feature.token_is_max_context.get(start_index, False): - continue - if end_index < start_index: - continue - length = end_index - start_index + 1 - if length > max_answer_length: - continue - prelim_predictions.append( - _PrelimPrediction( - feature_index=feature_index, - start_index=start_index, - end_index=end_index, - start_logit=result.start_logits[start_index], - end_logit=result.end_logits[end_index])) - - if is_version2: - prelim_predictions.append( - _PrelimPrediction( - feature_index=min_null_feature_index, - start_index=0, - end_index=0, - start_logit=null_start_logit, - end_logit=null_end_logit)) - - prelim_predictions = sorted( - prelim_predictions, - key=lambda x: (x.start_logit + x.end_logit), - reverse=True) - - _NbestPrediction = collections.namedtuple( # pylint: disable=invalid-name - "NbestPrediction", ["text", "start_logit", "end_logit"]) - - seen_predictions = {} - nbest = [] - for pred in prelim_predictions: - if len(nbest) >= n_best_size: - break - feature = features[pred.feature_index] - if pred.start_index > 0: - tok_tokens = feature.tokens[pred.start_index:(pred.end_index + 1)] - orig_doc_start = feature.token_to_orig_map[pred.start_index] - orig_doc_end = feature.token_to_orig_map[pred.end_index] - orig_tokens = example.doc_tokens[orig_doc_start:(orig_doc_end + 1)] - tok_text = " ".join(tok_tokens) - - # De-tokenize WordPieces that have been split off. - tok_text = tok_text.replace(" ##", "") - tok_text = tok_text.replace("##", "") - - # Clean whitespace - tok_text = tok_text.strip() - tok_text = " ".join(tok_text.split()) - orig_text = " ".join(orig_tokens) - - final_text = get_final_text(tok_text, orig_text, do_lower_case, verbose_logging) - if final_text in seen_predictions: - continue - seen_predictions[final_text] = True - else: - final_text = "" - seen_predictions[final_text] = True - - nbest.append( - _NbestPrediction( - text=final_text, - start_logit=pred.start_logit, - end_logit=pred.end_logit)) - - # if we didn't inlude the empty option in the n-best, inlcude it - if is_version2: - if "" not in seen_predictions: - nbest.append( - _NbestPrediction( - text="", start_logit=null_start_logit, - end_logit=null_end_logit)) - - # In very rare edge cases we could have no valid predictions. So we - # just create a nonce prediction in this case to avoid failure. - if not nbest: - nbest.append( - _NbestPrediction(text="empty", start_logit=0.0, end_logit=0.0)) - - assert len(nbest) >= 1 - - total_scores = [] - best_non_null_entry = None - for entry in nbest: - total_scores.append(entry.start_logit + entry.end_logit) - if not best_non_null_entry: - if entry.text: - best_non_null_entry = entry - - probs = _compute_softmax(total_scores) - - nbest_json = [] - for (i, entry) in enumerate(nbest): - output = collections.OrderedDict() - output["text"] = entry.text - output["probability"] = probs[i] - output["start_logit"] = entry.start_logit - output["end_logit"] = entry.end_logit - nbest_json.append(output) - - assert len(nbest_json) >= 1 - - - if not is_version2: - all_predictions[example.qas_id] = nbest_json[0]["text"] - else: - # predict "" iff the null score - the score of best non-null > threshold - score_diff = score_null - best_non_null_entry.start_logit - ( - best_non_null_entry.end_logit) - scores_diff_json[example.qas_id] = score_diff - if score_diff > null_score_diff_threshold: - all_predictions[example.qas_id] = "" - else: - all_predictions[example.qas_id] = best_non_null_entry.text - all_nbest_json[example.qas_id] = nbest_json - - with open(output_prediction_file, "w") as writer: - writer.write(json.dumps(all_predictions, indent=4) + "\n") - - with open(output_nbest_file, "w") as writer: - writer.write(json.dumps(all_nbest_json, indent=4) + "\n") - - if is_version2: - with open(output_null_log_odds_file, "w") as writer: - writer.write(json.dumps(scores_diff_json, indent=4) + "\n") - - -def get_final_text(pred_text, orig_text, do_lower_case, verbose_logging=False): - """Project the tokenized prediction back to the original text.""" - - # When we created the data, we kept track of the alignment between original - # (whitespace tokenized) tokens and our WordPiece tokenized tokens. So - # now `orig_text` contains the span of our original text corresponding to the - # span that we predicted. - # - # However, `orig_text` may contain extra characters that we don't want in - # our prediction. - # - # For example, let's say: - # pred_text = steve smith - # orig_text = Steve Smith's - # - # We don't want to return `orig_text` because it contains the extra "'s". - # - # We don't want to return `pred_text` because it's already been normalized - # (the SQuAD eval script also does punctuation stripping/lower casing but - # our tokenizer does additional normalization like stripping accent - # characters). - # - # What we really want to return is "Steve Smith". - # - # Therefore, we have to apply a semi-complicated alignment heruistic between - # `pred_text` and `orig_text` to get a character-to-charcter alignment. This - # can fail in certain cases in which case we just return `orig_text`. - - def _strip_spaces(text): - ns_chars = [] - ns_to_s_map = collections.OrderedDict() - for (i, c) in enumerate(text): - if c == " ": - continue - ns_to_s_map[len(ns_chars)] = i - ns_chars.append(c) - ns_text = "".join(ns_chars) - return (ns_text, ns_to_s_map) - - # We first tokenize `orig_text`, strip whitespace from the result - # and `pred_text`, and check if they are the same length. If they are - # NOT the same length, the heuristic has failed. If they are the same - # length, we assume the characters are one-to-one aligned. - tokenizer = BasicTokenizer(do_lower_case=do_lower_case) - - tok_text = " ".join(tokenizer.tokenize(orig_text)) - - start_position = tok_text.find(pred_text) - if start_position == -1: - if verbose_logging: - logger.info( - "Unable to find text: '%s' in '%s'" % (pred_text, orig_text)) - return orig_text - end_position = start_position + len(pred_text) - 1 - - (orig_ns_text, orig_ns_to_s_map) = _strip_spaces(orig_text) - (tok_ns_text, tok_ns_to_s_map) = _strip_spaces(tok_text) - - if len(orig_ns_text) != len(tok_ns_text): - if verbose_logging: - logger.info("Length not equal after stripping spaces: '%s' vs '%s'", - orig_ns_text, tok_ns_text) - return orig_text - - # We then project the characters in `pred_text` back to `orig_text` using - # the character-to-character alignment. - tok_s_to_ns_map = {} - for (i, tok_index) in tok_ns_to_s_map.items(): - tok_s_to_ns_map[tok_index] = i - - orig_start_position = None - if start_position in tok_s_to_ns_map: - ns_start_position = tok_s_to_ns_map[start_position] - if ns_start_position in orig_ns_to_s_map: - orig_start_position = orig_ns_to_s_map[ns_start_position] - - if orig_start_position is None: - if verbose_logging: - logger.info("Couldn't map start position") - return orig_text - - orig_end_position = None - if end_position in tok_s_to_ns_map: - ns_end_position = tok_s_to_ns_map[end_position] - if ns_end_position in orig_ns_to_s_map: - orig_end_position = orig_ns_to_s_map[ns_end_position] - - if orig_end_position is None: - if verbose_logging: - logger.info("Couldn't map end position") - return orig_text - - output_text = orig_text[orig_start_position:(orig_end_position + 1)] - return output_text - - -def _get_best_indexes(logits, n_best_size): - """Get the n-best logits from a list.""" - index_and_score = sorted(enumerate(logits), key=lambda x: x[1], reverse=True) - - best_indexes = [] - for i in range(len(index_and_score)): - if i >= n_best_size: - break - best_indexes.append(index_and_score[i][0]) - return best_indexes - - -def _compute_softmax(scores): - """Compute softmax probability over raw logits.""" - if not scores: - return [] - - max_score = None - for score in scores: - if max_score is None or score > max_score: - max_score = score - - exp_scores = [] - total_sum = 0.0 - for score in scores: - x = math.exp(score - max_score) - exp_scores.append(x) - total_sum += x - - probs = [] - for score in exp_scores: - probs.append(score / total_sum) - return probs - -def main(): - parser = argparse.ArgumentParser() - - ## Required parameters - parser.add_argument("--bert_model", default=None, type=str, required=True, - help="Bert pre-trained model selected in the list: bert-base-uncased, " - "bert-large-uncased, bert-base-cased, bert-base-multilingual, bert-base-chinese.") - parser.add_argument("--output_dir", default=None, type=str, required=True, - help="The output directory where the model checkpoints and predictions will be written.") - - ## Other parameters - parser.add_argument("--train_file", default=None, type=str, help="SQuAD json for training. E.g., train-v1.1.json") - parser.add_argument("--predict_file", default=None, type=str, - help="SQuAD json for predictions. E.g., dev-v1.1.json or test-v1.1.json") - parser.add_argument("--max_seq_length", default=384, type=int, - help="The maximum total input sequence length after WordPiece tokenization. Sequences " - "longer than this will be truncated, and sequences shorter than this will be padded.") - parser.add_argument("--doc_stride", default=128, type=int, - help="When splitting up a long document into chunks, how much stride to take between chunks.") - parser.add_argument("--max_query_length", default=64, type=int, - help="The maximum number of tokens for the question. Questions longer than this will " - "be truncated to this length.") - parser.add_argument("--do_train", default=False, action='store_true', help="Whether to run training.") - parser.add_argument("--do_predict", default=False, action='store_true', help="Whether to run eval on the dev set.") - parser.add_argument("--train_batch_size", default=32, type=int, help="Total batch size for training.") - parser.add_argument("--predict_batch_size", default=8, type=int, help="Total batch size for predictions.") - parser.add_argument("--learning_rate", default=5e-5, type=float, help="The initial learning rate for Adam.") - parser.add_argument("--num_train_epochs", default=3.0, type=float, - help="Total number of training epochs to perform.") - parser.add_argument("--warmup_proportion", default=0.1, type=float, - help="Proportion of training to perform linear learning rate warmup for. E.g., 0.1 = 10%% " - "of training.") - parser.add_argument("--n_best_size", default=20, type=int, - help="The total number of n-best predictions to generate in the nbest_predictions.json " - "output file.") - parser.add_argument("--max_answer_length", default=30, type=int, - help="The maximum length of an answer that can be generated. This is needed because the start " - "and end predictions are not conditioned on one another.") - parser.add_argument("--verbose_logging", default=False, action='store_true', - help="If true, all of the warnings related to data processing will be printed. " - "A number of warnings are expected for a normal SQuAD evaluation.") - parser.add_argument("--no_cuda", - default=False, - action='store_true', - help="Whether not to use CUDA when available") - parser.add_argument('--seed', - type=int, - default=42, - help="random seed for initialization") - parser.add_argument('--gradient_accumulation_steps', - type=int, - default=1, - help="Number of updates steps to accumulate before performing a backward/update pass.") - parser.add_argument("--do_lower_case", - action='store_true', - help="Whether to lower case the input text. True for uncased models, False for cased models.") - parser.add_argument("--local_rank", - type=int, - default=-1, - help="local_rank for distributed training on gpus") - parser.add_argument('--fp16', - default=False, - action='store_true', - help="Whether to use 16-bit float precision instead of 32-bit") - parser.add_argument('--loss_scale', - type=float, default=0, - help="Loss scaling to improve fp16 numeric stability. Only used when fp16 set to True.\n" - "0 (default value): dynamic loss scaling.\n" - "Positive power of 2: static loss scaling value.\n") - parser.add_argument('--null_score_diff_threshold', - type=float, default=0.0, - help="If null_score - best_non_null is greater than the threshold predict null.") - - args = parser.parse_args() - - if args.local_rank == -1 or args.no_cuda: - device = torch.device("cuda" if torch.cuda.is_available() and not args.no_cuda else "cpu") - n_gpu = torch.cuda.device_count() - else: - torch.cuda.set_device(args.local_rank) - device = torch.device("cuda", args.local_rank) - n_gpu = 1 - # Initializes the distributed backend which will take care of sychronizing nodes/GPUs - torch.distributed.init_process_group(backend='nccl') - logger.info("device: {} n_gpu: {}, distributed training: {}, 16-bits training: {}".format( - device, n_gpu, bool(args.local_rank != -1), args.fp16)) - - if args.gradient_accumulation_steps < 1: - raise ValueError("Invalid gradient_accumulation_steps parameter: {}, should be >= 1".format( - args.gradient_accumulation_steps)) - - args.train_batch_size = args.train_batch_size // args.gradient_accumulation_steps - - random.seed(args.seed) - np.random.seed(args.seed) - torch.manual_seed(args.seed) - if n_gpu > 0: - torch.cuda.manual_seed_all(args.seed) - - if not args.do_train and not args.do_predict: - raise ValueError("At least one of `do_train` or `do_predict` must be True.") - - if args.do_train: - if not args.train_file: - raise ValueError( - "If `do_train` is True, then `train_file` must be specified.") - if args.do_predict: - if not args.predict_file: - raise ValueError( - "If `do_predict` is True, then `predict_file` must be specified.") - - if os.path.exists(args.output_dir) and os.listdir(args.output_dir): - raise ValueError("Output directory () already exists and is not empty.") - os.makedirs(args.output_dir, exist_ok=True) - - tokenizer = BertTokenizer.from_pretrained(args.bert_model) - - train_examples = None - num_train_optimization_steps = None - if args.do_train: - train_examples = read_squad_examples( - input_file=args.train_file, is_training=True) - num_train_optimization_steps = int( - len(train_examples) / args.train_batch_size / args.gradient_accumulation_steps) * args.num_train_epochs - if args.local_rank != -1: - num_train_optimization_steps = num_train_optimization_steps // torch.distributed.get_world_size() - - # Prepare model - model = BertForQuestionAnswering.from_pretrained(args.bert_model, - cache_dir=PYTORCH_PRETRAINED_BERT_CACHE / 'distributed_{}'.format(args.local_rank)) - - if args.fp16: - model.half() - model.to(device) - if args.local_rank != -1: - try: - from apex.parallel import DistributedDataParallel as DDP - except ImportError: - raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use distributed and fp16 training.") - - model = DDP(model) - elif n_gpu > 1: - model = torch.nn.DataParallel(model) - - # Prepare optimizer - param_optimizer = list(model.named_parameters()) - - # hack to remove pooler, which is not used - # thus it produce None grad that break apex - param_optimizer = [n for n in param_optimizer if 'pooler' not in n[0]] - - no_decay = ['bias', 'LayerNorm.bias', 'LayerNorm.weight'] - optimizer_grouped_parameters = [ - {'params': [p for n, p in param_optimizer if not any(nd in n for nd in no_decay)], 'weight_decay': 0.01}, - {'params': [p for n, p in param_optimizer if any(nd in n for nd in no_decay)], 'weight_decay': 0.0} - ] - - if args.fp16: - try: - from apex.optimizers import FP16_Optimizer - from apex.optimizers import FusedAdam - except ImportError: - raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use distributed and fp16 training.") - - optimizer = FusedAdam(optimizer_grouped_parameters, - lr=args.learning_rate, - bias_correction=False, - max_grad_norm=1.0) - if args.loss_scale == 0: - optimizer = FP16_Optimizer(optimizer, dynamic_loss_scale=True) - else: - optimizer = FP16_Optimizer(optimizer, static_loss_scale=args.loss_scale) - else: - optimizer = BertAdam(optimizer_grouped_parameters, - lr=args.learning_rate, - warmup=args.warmup_proportion, - t_total=num_train_optimization_steps) - - global_step = 0 - if args.do_train: - cached_train_features_file = args.train_file+'_{0}_{1}_{2}_{3}'.format( - args.bert_model, str(args.max_seq_length), str(args.doc_stride), str(args.max_query_length)) - train_features = None - try: - with open(cached_train_features_file, "rb") as reader: - train_features = pickle.load(reader) - except: - train_features = convert_examples_to_features( - examples=train_examples, - tokenizer=tokenizer, - max_seq_length=args.max_seq_length, - doc_stride=args.doc_stride, - max_query_length=args.max_query_length, - is_training=True) - if args.local_rank == -1 or torch.distributed.get_rank() == 0: - logger.info(" Saving train features into cached file %s", cached_train_features_file) - with open(cached_train_features_file, "wb") as writer: - pickle.dump(train_features, writer) - logger.info("***** Running training *****") - logger.info(" Num orig examples = %d", len(train_examples)) - logger.info(" Num split examples = %d", len(train_features)) - logger.info(" Batch size = %d", args.train_batch_size) - logger.info(" Num steps = %d", num_train_optimization_steps) - all_input_ids = torch.tensor([f.input_ids for f in train_features], dtype=torch.long) - all_input_mask = torch.tensor([f.input_mask for f in train_features], dtype=torch.long) - all_segment_ids = torch.tensor([f.segment_ids for f in train_features], dtype=torch.long) - all_start_positions = torch.tensor([f.start_position for f in train_features], dtype=torch.long) - all_end_positions = torch.tensor([f.end_position for f in train_features], dtype=torch.long) - all_is_impossibles = torch.tensor([int(f.is_impossible) for f in train_features], dtype=torch.long) - train_data = TensorDataset(all_input_ids, all_input_mask, all_segment_ids, - all_start_positions, all_end_positions, all_is_impossibles) - if args.local_rank == -1: - train_sampler = RandomSampler(train_data) - else: - train_sampler = DistributedSampler(train_data) - train_dataloader = DataLoader(train_data, sampler=train_sampler, batch_size=args.train_batch_size) - - model.train() - for _ in trange(int(args.num_train_epochs), desc="Epoch"): - for step, batch in enumerate(tqdm(train_dataloader, desc="Iteration")): - if n_gpu == 1: - batch = tuple(t.to(device) for t in batch) # multi-gpu does scattering it-self - input_ids, input_mask, segment_ids, start_positions, end_positions, _ = batch - loss = model(input_ids, segment_ids, input_mask, start_positions, end_positions) - if n_gpu > 1: - loss = loss.mean() # mean() to average on multi-gpu. - if args.gradient_accumulation_steps > 1: - loss = loss / args.gradient_accumulation_steps - - if args.fp16: - optimizer.backward(loss) - else: - loss.backward() - if (step + 1) % args.gradient_accumulation_steps == 0: - if args.fp16: - # modify learning rate with special warm up BERT uses - # if args.fp16 is False, BertAdam is used that handles this automatically - lr_this_step = args.learning_rate * warmup_linear(global_step/num_train_optimization_steps, args.warmup_proportion) - for param_group in optimizer.param_groups: - param_group['lr'] = lr_this_step - optimizer.step() - optimizer.zero_grad() - global_step += 1 - - # Save a trained model - model_to_save = model.module if hasattr(model, 'module') else model # Only save the model it-self - output_model_file = os.path.join(args.output_dir, "pytorch_model.bin") - if args.do_train: - torch.save(model_to_save.state_dict(), output_model_file) - - # Load a trained model that you have fine-tuned - model_state_dict = torch.load(output_model_file) - model = BertForQuestionAnswering.from_pretrained(args.bert_model, state_dict=model_state_dict) - model.to(device) - - if args.do_predict and (args.local_rank == -1 or torch.distributed.get_rank() == 0): - eval_examples = read_squad_examples( - input_file=args.predict_file, is_training=False) - eval_features = convert_examples_to_features( - examples=eval_examples, - tokenizer=tokenizer, - max_seq_length=args.max_seq_length, - doc_stride=args.doc_stride, - max_query_length=args.max_query_length, - is_training=False) - - logger.info("***** Running predictions *****") - logger.info(" Num orig examples = %d", len(eval_examples)) - logger.info(" Num split examples = %d", len(eval_features)) - logger.info(" Batch size = %d", args.predict_batch_size) - - all_input_ids = torch.tensor([f.input_ids for f in eval_features], dtype=torch.long) - all_input_mask = torch.tensor([f.input_mask for f in eval_features], dtype=torch.long) - all_segment_ids = torch.tensor([f.segment_ids for f in eval_features], dtype=torch.long) - all_example_index = torch.arange(all_input_ids.size(0), dtype=torch.long) - eval_data = TensorDataset(all_input_ids, all_input_mask, all_segment_ids, all_example_index) - # Run prediction for full data - eval_sampler = SequentialSampler(eval_data) - eval_dataloader = DataLoader(eval_data, sampler=eval_sampler, batch_size=args.predict_batch_size) - - model.eval() - all_results = [] - logger.info("Start evaluating") - for input_ids, input_mask, segment_ids, example_indices in tqdm(eval_dataloader, desc="Evaluating"): - if len(all_results) % 1000 == 0: - logger.info("Processing example: %d" % (len(all_results))) - input_ids = input_ids.to(device) - input_mask = input_mask.to(device) - segment_ids = segment_ids.to(device) - with torch.no_grad(): - batch_start_logits, batch_end_logits = model(input_ids, segment_ids, input_mask) - for i, example_index in enumerate(example_indices): - start_logits = batch_start_logits[i].detach().cpu().tolist() - end_logits = batch_end_logits[i].detach().cpu().tolist() - eval_feature = eval_features[example_index.item()] - unique_id = int(eval_feature.unique_id) - all_results.append(RawResult(unique_id=unique_id, - start_logits=start_logits, - end_logits=end_logits)) - output_prediction_file = os.path.join(args.output_dir, "predictions.json") - output_nbest_file = os.path.join(args.output_dir, "nbest_predictions.json") - output_null_log_odds_file = os.path.join(args.output_dir, "null_odds.json") - write_predictions(eval_examples, eval_features, all_results, - args.n_best_size, args.max_answer_length, - args.do_lower_case, output_prediction_file, - output_nbest_file, output_null_log_odds_file, args.verbose_logging, True, args.null_score_diff_threshold) - - -if __name__ == "__main__": - main()