496 lines
26 KiB
Python
496 lines
26 KiB
Python
# coding=utf-8
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# Copyright 2018 The Google AI Language Team Authors and The HuggingFace Inc. team.
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# Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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""" Finetuning the library models for sequence classification on GLUE (Bert, XLM, XLNet, RoBERTa)."""
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from __future__ import absolute_import, division, print_function
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import argparse
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import glob
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import logging
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import os
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import random
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import numpy as np
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import torch
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from torch.utils.data import (DataLoader, RandomSampler, SequentialSampler,
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TensorDataset)
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from torch.utils.data.distributed import DistributedSampler
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from tensorboardX import SummaryWriter
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from tqdm import tqdm, trange
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from pytorch_transformers import (WEIGHTS_NAME, BertConfig,
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BertForSequenceClassification, BertTokenizer,
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RobertaConfig,
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RobertaForSequenceClassification,
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RobertaTokenizer,
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XLMConfig, XLMForSequenceClassification,
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XLMTokenizer, XLNetConfig,
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XLNetForSequenceClassification,
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XLNetTokenizer)
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from pytorch_transformers import AdamW, WarmupLinearSchedule
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from utils_glue import (compute_metrics, convert_examples_to_features,
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output_modes, processors)
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logger = logging.getLogger(__name__)
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ALL_MODELS = sum((tuple(conf.pretrained_config_archive_map.keys()) for conf in (BertConfig, XLNetConfig, XLMConfig, RobertaConfig)), ())
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MODEL_CLASSES = {
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'bert': (BertConfig, BertForSequenceClassification, BertTokenizer),
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'xlnet': (XLNetConfig, XLNetForSequenceClassification, XLNetTokenizer),
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'xlm': (XLMConfig, XLMForSequenceClassification, XLMTokenizer),
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'roberta': (RobertaConfig, RobertaForSequenceClassification, RobertaTokenizer),
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}
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def set_seed(args):
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random.seed(args.seed)
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np.random.seed(args.seed)
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torch.manual_seed(args.seed)
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if args.n_gpu > 0:
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torch.cuda.manual_seed_all(args.seed)
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def train(args, train_dataset, model, tokenizer):
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""" Train the model """
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if args.local_rank in [-1, 0]:
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tb_writer = SummaryWriter()
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args.train_batch_size = args.per_gpu_train_batch_size * max(1, args.n_gpu)
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train_sampler = RandomSampler(train_dataset) if args.local_rank == -1 else DistributedSampler(train_dataset)
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train_dataloader = DataLoader(train_dataset, sampler=train_sampler, batch_size=args.train_batch_size)
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if args.max_steps > 0:
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t_total = args.max_steps
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args.num_train_epochs = args.max_steps // (len(train_dataloader) // args.gradient_accumulation_steps) + 1
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else:
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t_total = len(train_dataloader) // args.gradient_accumulation_steps * args.num_train_epochs
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# Prepare optimizer and schedule (linear warmup and decay)
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no_decay = ['bias', 'LayerNorm.weight']
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optimizer_grouped_parameters = [
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{'params': [p for n, p in model.named_parameters() if not any(nd in n for nd in no_decay)], 'weight_decay': args.weight_decay},
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{'params': [p for n, p in model.named_parameters() if any(nd in n for nd in no_decay)], 'weight_decay': 0.0}
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]
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optimizer = AdamW(optimizer_grouped_parameters, lr=args.learning_rate, eps=args.adam_epsilon)
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scheduler = WarmupLinearSchedule(optimizer, warmup_steps=args.warmup_steps, t_total=t_total)
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if args.fp16:
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try:
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from apex import amp
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except ImportError:
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raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
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model, optimizer = amp.initialize(model, optimizer, opt_level=args.fp16_opt_level)
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# multi-gpu training (should be after apex fp16 initialization)
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if args.n_gpu > 1:
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model = torch.nn.DataParallel(model)
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# Distributed training (should be after apex fp16 initialization)
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if args.local_rank != -1:
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model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[args.local_rank],
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output_device=args.local_rank,
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find_unused_parameters=True)
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# Train!
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logger.info("***** Running training *****")
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logger.info(" Num examples = %d", len(train_dataset))
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logger.info(" Num Epochs = %d", args.num_train_epochs)
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logger.info(" Instantaneous batch size per GPU = %d", args.per_gpu_train_batch_size)
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logger.info(" Total train batch size (w. parallel, distributed & accumulation) = %d",
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args.train_batch_size * args.gradient_accumulation_steps * (torch.distributed.get_world_size() if args.local_rank != -1 else 1))
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logger.info(" Gradient Accumulation steps = %d", args.gradient_accumulation_steps)
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logger.info(" Total optimization steps = %d", t_total)
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global_step = 0
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tr_loss, logging_loss = 0.0, 0.0
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model.zero_grad()
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train_iterator = trange(int(args.num_train_epochs), desc="Epoch", disable=args.local_rank not in [-1, 0])
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set_seed(args) # Added here for reproductibility (even between python 2 and 3)
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for _ in train_iterator:
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epoch_iterator = tqdm(train_dataloader, desc="Iteration", disable=args.local_rank not in [-1, 0])
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for step, batch in enumerate(epoch_iterator):
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model.train()
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batch = tuple(t.to(args.device) for t in batch)
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inputs = {'input_ids': batch[0],
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'attention_mask': batch[1],
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'token_type_ids': batch[2] if args.model_type in ['bert', 'xlnet'] else None, # XLM and RoBERTa don't use segment_ids
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'labels': batch[3]}
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outputs = model(**inputs)
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loss = outputs[0] # model outputs are always tuple in pytorch-transformers (see doc)
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if args.n_gpu > 1:
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loss = loss.mean() # mean() to average on multi-gpu parallel training
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if args.gradient_accumulation_steps > 1:
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loss = loss / args.gradient_accumulation_steps
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if args.fp16:
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with amp.scale_loss(loss, optimizer) as scaled_loss:
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scaled_loss.backward()
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torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), args.max_grad_norm)
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else:
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loss.backward()
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torch.nn.utils.clip_grad_norm_(model.parameters(), args.max_grad_norm)
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tr_loss += loss.item()
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if (step + 1) % args.gradient_accumulation_steps == 0:
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scheduler.step() # Update learning rate schedule
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optimizer.step()
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model.zero_grad()
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global_step += 1
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if args.local_rank in [-1, 0] and args.logging_steps > 0 and global_step % args.logging_steps == 0:
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# Log metrics
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if args.local_rank == -1 and args.evaluate_during_training: # Only evaluate when single GPU otherwise metrics may not average well
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results = evaluate(args, model, tokenizer)
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for key, value in results.items():
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tb_writer.add_scalar('eval_{}'.format(key), value, global_step)
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tb_writer.add_scalar('lr', scheduler.get_lr()[0], global_step)
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tb_writer.add_scalar('loss', (tr_loss - logging_loss)/args.logging_steps, global_step)
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logging_loss = tr_loss
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if args.local_rank in [-1, 0] and args.save_steps > 0 and global_step % args.save_steps == 0:
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# Save model checkpoint
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output_dir = os.path.join(args.output_dir, 'checkpoint-{}'.format(global_step))
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if not os.path.exists(output_dir):
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os.makedirs(output_dir)
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model_to_save = model.module if hasattr(model, 'module') else model # Take care of distributed/parallel training
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model_to_save.save_pretrained(output_dir)
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torch.save(args, os.path.join(output_dir, 'training_args.bin'))
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logger.info("Saving model checkpoint to %s", output_dir)
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if args.max_steps > 0 and global_step > args.max_steps:
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epoch_iterator.close()
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break
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if args.max_steps > 0 and global_step > args.max_steps:
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train_iterator.close()
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break
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if args.local_rank in [-1, 0]:
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tb_writer.close()
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return global_step, tr_loss / global_step
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def evaluate(args, model, tokenizer, prefix=""):
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# Loop to handle MNLI double evaluation (matched, mis-matched)
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eval_task_names = ("mnli", "mnli-mm") if args.task_name == "mnli" else (args.task_name,)
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eval_outputs_dirs = (args.output_dir, args.output_dir + '-MM') if args.task_name == "mnli" else (args.output_dir,)
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results = {}
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for eval_task, eval_output_dir in zip(eval_task_names, eval_outputs_dirs):
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eval_dataset = load_and_cache_examples(args, eval_task, tokenizer, evaluate=True)
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if not os.path.exists(eval_output_dir) and args.local_rank in [-1, 0]:
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os.makedirs(eval_output_dir)
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args.eval_batch_size = args.per_gpu_eval_batch_size * max(1, args.n_gpu)
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# Note that DistributedSampler samples randomly
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eval_sampler = SequentialSampler(eval_dataset) if args.local_rank == -1 else DistributedSampler(eval_dataset)
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eval_dataloader = DataLoader(eval_dataset, sampler=eval_sampler, batch_size=args.eval_batch_size)
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# Eval!
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logger.info("***** Running evaluation {} *****".format(prefix))
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logger.info(" Num examples = %d", len(eval_dataset))
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logger.info(" Batch size = %d", args.eval_batch_size)
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eval_loss = 0.0
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nb_eval_steps = 0
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preds = None
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out_label_ids = None
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for batch in tqdm(eval_dataloader, desc="Evaluating"):
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model.eval()
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batch = tuple(t.to(args.device) for t in batch)
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with torch.no_grad():
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inputs = {'input_ids': batch[0],
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'attention_mask': batch[1],
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'token_type_ids': batch[2] if args.model_type in ['bert', 'xlnet'] else None, # XLM and RoBERTa don't use segment_ids
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'labels': batch[3]}
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outputs = model(**inputs)
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tmp_eval_loss, logits = outputs[:2]
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eval_loss += tmp_eval_loss.mean().item()
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nb_eval_steps += 1
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if preds is None:
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preds = logits.detach().cpu().numpy()
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out_label_ids = inputs['labels'].detach().cpu().numpy()
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else:
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preds = np.append(preds, logits.detach().cpu().numpy(), axis=0)
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out_label_ids = np.append(out_label_ids, inputs['labels'].detach().cpu().numpy(), axis=0)
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eval_loss = eval_loss / nb_eval_steps
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if args.output_mode == "classification":
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preds = np.argmax(preds, axis=1)
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elif args.output_mode == "regression":
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preds = np.squeeze(preds)
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result = compute_metrics(eval_task, preds, out_label_ids)
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results.update(result)
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output_eval_file = os.path.join(eval_output_dir, "eval_results.txt")
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with open(output_eval_file, "w") as writer:
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logger.info("***** Eval results {} *****".format(prefix))
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for key in sorted(result.keys()):
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logger.info(" %s = %s", key, str(result[key]))
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writer.write("%s = %s\n" % (key, str(result[key])))
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return results
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def load_and_cache_examples(args, task, tokenizer, evaluate=False):
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if args.local_rank not in [-1, 0] and not evaluate:
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torch.distributed.barrier() # Make sure only the first process in distributed training process the dataset, and the others will use the cache
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processor = processors[task]()
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output_mode = output_modes[task]
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# Load data features from cache or dataset file
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cached_features_file = os.path.join(args.data_dir, 'cached_{}_{}_{}_{}'.format(
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'dev' if evaluate else 'train',
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list(filter(None, args.model_name_or_path.split('/'))).pop(),
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str(args.max_seq_length),
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str(task)))
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if os.path.exists(cached_features_file):
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logger.info("Loading features from cached file %s", cached_features_file)
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features = torch.load(cached_features_file)
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else:
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logger.info("Creating features from dataset file at %s", args.data_dir)
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label_list = processor.get_labels()
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if task in ['mnli', 'mnli-mm'] and args.model_type in ['roberta']:
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# HACK(label indices are swapped in RoBERTa pretrained model)
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label_list[1], label_list[2] = label_list[2], label_list[1]
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examples = processor.get_dev_examples(args.data_dir) if evaluate else processor.get_train_examples(args.data_dir)
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features = convert_examples_to_features(examples, label_list, args.max_seq_length, tokenizer, output_mode,
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cls_token_at_end=bool(args.model_type in ['xlnet']), # xlnet has a cls token at the end
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cls_token=tokenizer.cls_token,
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cls_token_segment_id=2 if args.model_type in ['xlnet'] else 0,
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sep_token=tokenizer.sep_token,
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sep_token_extra=bool(args.model_type in ['roberta']), # roberta uses an extra separator b/w pairs of sentences, cf. github.com/pytorch/fairseq/commit/1684e166e3da03f5b600dbb7855cb98ddfcd0805
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pad_on_left=bool(args.model_type in ['xlnet']), # pad on the left for xlnet
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pad_token=tokenizer.convert_tokens_to_ids([tokenizer.pad_token])[0],
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pad_token_segment_id=4 if args.model_type in ['xlnet'] else 0,
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)
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if args.local_rank in [-1, 0]:
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logger.info("Saving features into cached file %s", cached_features_file)
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torch.save(features, cached_features_file)
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if args.local_rank == 0 and not evaluate:
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torch.distributed.barrier() # Make sure only the first process in distributed training process the dataset, and the others will use the cache
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# Convert to Tensors and build dataset
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all_input_ids = torch.tensor([f.input_ids for f in features], dtype=torch.long)
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all_input_mask = torch.tensor([f.input_mask for f in features], dtype=torch.long)
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all_segment_ids = torch.tensor([f.segment_ids for f in features], dtype=torch.long)
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if output_mode == "classification":
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all_label_ids = torch.tensor([f.label_id for f in features], dtype=torch.long)
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elif output_mode == "regression":
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all_label_ids = torch.tensor([f.label_id for f in features], dtype=torch.float)
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dataset = TensorDataset(all_input_ids, all_input_mask, all_segment_ids, all_label_ids)
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return dataset
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def main():
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parser = argparse.ArgumentParser()
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## Required parameters
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parser.add_argument("--data_dir", default=None, type=str, required=True,
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help="The input data dir. Should contain the .tsv files (or other data files) for the task.")
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parser.add_argument("--model_type", default=None, type=str, required=True,
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help="Model type selected in the list: " + ", ".join(MODEL_CLASSES.keys()))
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parser.add_argument("--model_name_or_path", default=None, type=str, required=True,
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help="Path to pre-trained model or shortcut name selected in the list: " + ", ".join(ALL_MODELS))
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parser.add_argument("--task_name", default=None, type=str, required=True,
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help="The name of the task to train selected in the list: " + ", ".join(processors.keys()))
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parser.add_argument("--output_dir", default=None, type=str, required=True,
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help="The output directory where the model predictions and checkpoints will be written.")
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## Other parameters
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parser.add_argument("--config_name", default="", type=str,
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help="Pretrained config name or path if not the same as model_name")
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parser.add_argument("--tokenizer_name", default="", type=str,
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help="Pretrained tokenizer name or path if not the same as model_name")
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parser.add_argument("--cache_dir", default="", type=str,
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help="Where do you want to store the pre-trained models downloaded from s3")
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parser.add_argument("--max_seq_length", default=128, type=int,
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help="The maximum total input sequence length after tokenization. Sequences longer "
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"than this will be truncated, sequences shorter will be padded.")
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parser.add_argument("--do_train", action='store_true',
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help="Whether to run training.")
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parser.add_argument("--do_eval", action='store_true',
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help="Whether to run eval on the dev set.")
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parser.add_argument("--evaluate_during_training", action='store_true',
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help="Rul evaluation during training at each logging step.")
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parser.add_argument("--do_lower_case", action='store_true',
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help="Set this flag if you are using an uncased model.")
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parser.add_argument("--per_gpu_train_batch_size", default=8, type=int,
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help="Batch size per GPU/CPU for training.")
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parser.add_argument("--per_gpu_eval_batch_size", default=8, type=int,
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help="Batch size per GPU/CPU for evaluation.")
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parser.add_argument('--gradient_accumulation_steps', type=int, default=1,
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help="Number of updates steps to accumulate before performing a backward/update pass.")
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parser.add_argument("--learning_rate", default=5e-5, type=float,
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help="The initial learning rate for Adam.")
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parser.add_argument("--weight_decay", default=0.0, type=float,
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help="Weight deay if we apply some.")
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parser.add_argument("--adam_epsilon", default=1e-8, type=float,
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help="Epsilon for Adam optimizer.")
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parser.add_argument("--max_grad_norm", default=1.0, type=float,
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help="Max gradient norm.")
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parser.add_argument("--num_train_epochs", default=3.0, type=float,
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help="Total number of training epochs to perform.")
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parser.add_argument("--max_steps", default=-1, type=int,
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help="If > 0: set total number of training steps to perform. Override num_train_epochs.")
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parser.add_argument("--warmup_steps", default=0, type=int,
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help="Linear warmup over warmup_steps.")
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parser.add_argument('--logging_steps', type=int, default=50,
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help="Log every X updates steps.")
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parser.add_argument('--save_steps', type=int, default=50,
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help="Save checkpoint every X updates steps.")
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parser.add_argument("--eval_all_checkpoints", action='store_true',
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help="Evaluate all checkpoints starting with the same prefix as model_name ending and ending with step number")
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parser.add_argument("--no_cuda", action='store_true',
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help="Avoid using CUDA when available")
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parser.add_argument('--overwrite_output_dir', action='store_true',
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help="Overwrite the content of the output directory")
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parser.add_argument('--overwrite_cache', action='store_true',
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help="Overwrite the cached training and evaluation sets")
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parser.add_argument('--seed', type=int, default=42,
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help="random seed for initialization")
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parser.add_argument('--fp16', action='store_true',
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help="Whether to use 16-bit (mixed) precision (through NVIDIA apex) instead of 32-bit")
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parser.add_argument('--fp16_opt_level', type=str, default='O1',
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help="For fp16: Apex AMP optimization level selected in ['O0', 'O1', 'O2', and 'O3']."
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"See details at https://nvidia.github.io/apex/amp.html")
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parser.add_argument("--local_rank", type=int, default=-1,
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help="For distributed training: local_rank")
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parser.add_argument('--server_ip', type=str, default='', help="For distant debugging.")
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parser.add_argument('--server_port', type=str, default='', help="For distant debugging.")
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args = parser.parse_args()
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if os.path.exists(args.output_dir) and os.listdir(args.output_dir) and args.do_train and not args.overwrite_output_dir:
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raise ValueError("Output directory ({}) already exists and is not empty. Use --overwrite_output_dir to overcome.".format(args.output_dir))
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|
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# Setup distant debugging if needed
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if args.server_ip and args.server_port:
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# Distant debugging - see https://code.visualstudio.com/docs/python/debugging#_attach-to-a-local-script
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import ptvsd
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print("Waiting for debugger attach")
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ptvsd.enable_attach(address=(args.server_ip, args.server_port), redirect_output=True)
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ptvsd.wait_for_attach()
|
|
|
|
# Setup CUDA, GPU & distributed training
|
|
if args.local_rank == -1 or args.no_cuda:
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device = torch.device("cuda" if torch.cuda.is_available() and not args.no_cuda else "cpu")
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args.n_gpu = torch.cuda.device_count()
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else: # Initializes the distributed backend which will take care of sychronizing nodes/GPUs
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|
torch.cuda.set_device(args.local_rank)
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device = torch.device("cuda", args.local_rank)
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|
torch.distributed.init_process_group(backend='nccl')
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|
args.n_gpu = 1
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|
args.device = device
|
|
|
|
# Setup logging
|
|
logging.basicConfig(format = '%(asctime)s - %(levelname)s - %(name)s - %(message)s',
|
|
datefmt = '%m/%d/%Y %H:%M:%S',
|
|
level = logging.INFO if args.local_rank in [-1, 0] else logging.WARN)
|
|
logger.warning("Process rank: %s, device: %s, n_gpu: %s, distributed training: %s, 16-bits training: %s",
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|
args.local_rank, device, args.n_gpu, bool(args.local_rank != -1), args.fp16)
|
|
|
|
# Set seed
|
|
set_seed(args)
|
|
|
|
# Prepare GLUE task
|
|
args.task_name = args.task_name.lower()
|
|
if args.task_name not in processors:
|
|
raise ValueError("Task not found: %s" % (args.task_name))
|
|
processor = processors[args.task_name]()
|
|
args.output_mode = output_modes[args.task_name]
|
|
label_list = processor.get_labels()
|
|
num_labels = len(label_list)
|
|
|
|
# Load pretrained model and tokenizer
|
|
if args.local_rank not in [-1, 0]:
|
|
torch.distributed.barrier() # Make sure only the first process in distributed training will download model & vocab
|
|
|
|
args.model_type = args.model_type.lower()
|
|
config_class, model_class, tokenizer_class = MODEL_CLASSES[args.model_type]
|
|
config = config_class.from_pretrained(args.config_name if args.config_name else args.model_name_or_path, num_labels=num_labels, finetuning_task=args.task_name)
|
|
tokenizer = tokenizer_class.from_pretrained(args.tokenizer_name if args.tokenizer_name else args.model_name_or_path, do_lower_case=args.do_lower_case)
|
|
model = model_class.from_pretrained(args.model_name_or_path, from_tf=bool('.ckpt' in args.model_name_or_path), config=config)
|
|
|
|
if args.local_rank == 0:
|
|
torch.distributed.barrier() # Make sure only the first process in distributed training will download model & vocab
|
|
|
|
model.to(args.device)
|
|
|
|
logger.info("Training/evaluation parameters %s", args)
|
|
|
|
|
|
# Training
|
|
if args.do_train:
|
|
train_dataset = load_and_cache_examples(args, args.task_name, tokenizer, evaluate=False)
|
|
global_step, tr_loss = train(args, train_dataset, model, tokenizer)
|
|
logger.info(" global_step = %s, average loss = %s", global_step, tr_loss)
|
|
|
|
|
|
# Saving best-practices: if you use defaults names for the model, you can reload it using from_pretrained()
|
|
if args.do_train and (args.local_rank == -1 or torch.distributed.get_rank() == 0):
|
|
# Create output directory if needed
|
|
if not os.path.exists(args.output_dir) and args.local_rank in [-1, 0]:
|
|
os.makedirs(args.output_dir)
|
|
|
|
logger.info("Saving model checkpoint to %s", args.output_dir)
|
|
# Save a trained model, configuration and tokenizer using `save_pretrained()`.
|
|
# They can then be reloaded using `from_pretrained()`
|
|
model_to_save = model.module if hasattr(model, 'module') else model # Take care of distributed/parallel training
|
|
model_to_save.save_pretrained(args.output_dir)
|
|
tokenizer.save_pretrained(args.output_dir)
|
|
|
|
# Good practice: save your training arguments together with the trained model
|
|
torch.save(args, os.path.join(args.output_dir, 'training_args.bin'))
|
|
|
|
# Load a trained model and vocabulary that you have fine-tuned
|
|
model = model_class.from_pretrained(args.output_dir)
|
|
tokenizer = tokenizer_class.from_pretrained(args.output_dir, do_lower_case=args.do_lower_case)
|
|
model.to(args.device)
|
|
|
|
|
|
# Evaluation
|
|
results = {}
|
|
if args.do_eval and args.local_rank in [-1, 0]:
|
|
tokenizer = tokenizer_class.from_pretrained(args.output_dir, do_lower_case=args.do_lower_case)
|
|
checkpoints = [args.output_dir]
|
|
if args.eval_all_checkpoints:
|
|
checkpoints = list(os.path.dirname(c) for c in sorted(glob.glob(args.output_dir + '/**/' + WEIGHTS_NAME, recursive=True)))
|
|
logging.getLogger("pytorch_transformers.modeling_utils").setLevel(logging.WARN) # Reduce logging
|
|
logger.info("Evaluate the following checkpoints: %s", checkpoints)
|
|
for checkpoint in checkpoints:
|
|
global_step = checkpoint.split('-')[-1] if len(checkpoints) > 1 else ""
|
|
model = model_class.from_pretrained(checkpoint)
|
|
model.to(args.device)
|
|
result = evaluate(args, model, tokenizer, prefix=global_step)
|
|
result = dict((k + '_{}'.format(global_step), v) for k, v in result.items())
|
|
results.update(result)
|
|
|
|
return results
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|