# Copyright (c) 2020 PaddlePaddle Authors. 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. import argparse import logging import os import random import time from functools import partial import numpy as np import paddle from paddle.io import DataLoader from paddlenlp.datasets import GlueQNLI, GlueSST2 from paddlenlp.data import Stack, Tuple, Pad from paddlenlp.data.sampler import SamplerHelper from paddlenlp.transformers import BertForSequenceClassification, BertTokenizer FORMAT = '%(asctime)s-%(levelname)s: %(message)s' logging.basicConfig(level=logging.INFO, format=FORMAT) logger = logging.getLogger(__name__) TASK_CLASSES = { "qnli": (GlueQNLI, paddle.metric.Accuracy), # (dataset, metric) "sst-2": (GlueSST2, paddle.metric.Accuracy), } MODEL_CLASSES = {"bert": (BertForSequenceClassification, BertTokenizer), } def parse_args(): parser = argparse.ArgumentParser() # Required parameters parser.add_argument( "--task_name", default=None, type=str, required=True, help="The name of the task to train selected in the list: " + ", ".join(TASK_CLASSES.keys()), ) parser.add_argument( "--model_type", default=None, type=str, required=True, help="Model type selected in the list: " + ", ".join(MODEL_CLASSES.keys()), ) parser.add_argument( "--model_name_or_path", default=None, type=str, required=True, help="Path to pre-trained model or shortcut name selected in the list: " + ", ".join( sum([ list(classes[-1].pretrained_init_configuration.keys()) for classes in MODEL_CLASSES.values() ], [])), ) parser.add_argument( "--output_dir", default=None, type=str, required=True, help="The output directory where the model predictions and checkpoints will be written.", ) parser.add_argument( "--max_seq_length", default=128, type=int, help="The maximum total input sequence length after tokenization. Sequences longer " "than this will be truncated, sequences shorter will be padded.", ) parser.add_argument( "--batch_size", default=8, type=int, help="Batch size per GPU/CPU for training.", ) parser.add_argument( "--learning_rate", default=5e-5, type=float, help="The initial learning rate for Adam.") parser.add_argument( "--weight_decay", default=0.0, type=float, help="Weight decay if we apply some.") parser.add_argument( "--adam_epsilon", default=1e-8, type=float, help="Epsilon for Adam optimizer.") parser.add_argument( "--max_grad_norm", default=1.0, type=float, help="Max gradient norm.") parser.add_argument( "--num_train_epochs", default=3, type=int, help="Total number of training epochs to perform.", ) parser.add_argument( "--max_steps", default=-1, type=int, help="If > 0: set total number of training steps to perform. Override num_train_epochs.", ) parser.add_argument( "--warmup_steps", default=0, type=int, help="Linear warmup over warmup_steps.") parser.add_argument( "--logging_steps", type=int, default=500, help="Log every X updates steps.") parser.add_argument( "--save_steps", type=int, default=500, help="Save checkpoint every X updates steps.") parser.add_argument( "--seed", type=int, default=42, help="Random seed for initialization") args = parser.parse_args() return args def create_data_holder(): input_ids = paddle.static.data( name="input_ids", shape=[-1, -1], dtype="int64") segment_ids = paddle.static.data( name="segment_ids", shape=[-1, -1], dtype="int64") label = paddle.static.data(name="label", shape=[-1, 1], dtype="int64") return [input_ids, segment_ids, label] def reset_program_state_dict(model, state_dict, pretrained_state_dict): reset_state_dict = {} scale = model.initializer_range if hasattr(model, "initializer_range")\ else model.bert.config["initializer_range"] for n, p in state_dict.items(): if n not in pretrained_state_dict: dtype_str = "float32" if str(p.dtype) == "VarType.FP64": dtype_str = "float64" reset_state_dict[p.name] = np.random.normal( loc=0.0, scale=scale, size=p.shape).astype(dtype_str) else: reset_state_dict[p.name] = pretrained_state_dict[n] return reset_state_dict def set_seed(args): # Use the same data seed(for data shuffle) for all procs to guarantee data # consistency after sharding. random.seed(args.seed) np.random.seed(args.seed) # Maybe different op seeds(for dropout) for different procs is better. By: # `paddle.seed(args.seed + paddle.distributed.get_rank())` paddle.seed(args.seed) def evaluate(exe, metric, loss, correct, dev_program, data_loader): metric.reset() for batch in data_loader: loss_return, correct_return = exe.run(dev_program, feed=batch, \ fetch_list=[loss, correct]) metric.update(correct_return) accuracy = metric.accumulate() print("eval loss: %f, accuracy: %f" % (loss_return, accuracy)) def convert_example(example, tokenizer, label_list, max_seq_length=512, is_test=False): """convert a glue example into necessary features""" def _truncate_seqs(seqs, max_seq_length): if len(seqs) == 1: # single sentence # Account for [CLS] and [SEP] with "- 2" seqs[0] = seqs[0][0:(max_seq_length - 2)] else: # sentence pair # Account for [CLS], [SEP], [SEP] with "- 3" tokens_a, tokens_b = seqs max_seq_length -= 3 while True: # truncate with longest_first strategy total_length = len(tokens_a) + len(tokens_b) if total_length <= max_seq_length: break if len(tokens_a) > len(tokens_b): tokens_a.pop() else: tokens_b.pop() return seqs def _concat_seqs(seqs, separators, seq_mask=0, separator_mask=1): concat = sum((seq + sep for sep, seq in zip(separators, seqs)), []) segment_ids = sum( ([i] * (len(seq) + len(sep)) for i, (sep, seq) in enumerate(zip(separators, seqs))), []) if isinstance(seq_mask, int): seq_mask = [[seq_mask] * len(seq) for seq in seqs] if isinstance(separator_mask, int): separator_mask = [[separator_mask] * len(sep) for sep in separators] p_mask = sum((s_mask + mask for sep, seq, s_mask, mask in zip( separators, seqs, seq_mask, separator_mask)), []) return concat, segment_ids, p_mask if not is_test: # `label_list == None` is for regression task label_dtype = "int64" if label_list else "float32" # get the label label = example[-1] example = example[:-1] #create label maps if classification task if label_list: label_map = {} for (i, l) in enumerate(label_list): label_map[l] = i label = label_map[label] label = [label] #label = np.array([label], dtype=label_dtype) # tokenize raw text tokens_raw = [tokenizer(l) for l in example] # truncate to the truncate_length, tokens_trun = _truncate_seqs(tokens_raw, max_seq_length) # concate the sequences with special tokens tokens_trun[0] = [tokenizer.cls_token] + tokens_trun[0] tokens, segment_ids, _ = _concat_seqs(tokens_trun, [[tokenizer.sep_token]] * len(tokens_trun)) # convert the token to ids 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) if not is_test: return input_ids, segment_ids, label else: return input_ids, segment_ids def do_train(args): # Set the paddle execute enviroment paddle.enable_static() place = paddle.CUDAPlace(0) set_seed(args) # Create the main_program for the training and dev_program for the validation main_program = paddle.static.default_main_program() startup_program = paddle.static.default_startup_program() dev_program = paddle.static.Program() # Get the configuration of tokenizer and model args.task_name = args.task_name.lower() args.model_type = args.model_type.lower() model_class, tokenizer_class = MODEL_CLASSES[args.model_type] dataset_class, metric_class = TASK_CLASSES[args.task_name] # Create the tokenizer and dataset tokenizer = tokenizer_class.from_pretrained(args.model_name_or_path) train_dataset, dev_dataset = dataset_class.get_datasets(["train", "dev"]) trans_func = partial( convert_example, tokenizer=tokenizer, label_list=train_dataset.get_labels(), max_seq_length=args.max_seq_length) train_dataset = train_dataset.apply(trans_func, lazy=True) batchify_fn = lambda samples, fn=Tuple( Pad(axis=0, pad_val=tokenizer.pad_token_id), # input Pad(axis=0, pad_val=tokenizer.pad_token_id), # segment Stack(dtype="int64" if train_dataset.get_labels() else "float32") # label ): [data for i, data in enumerate(fn(samples))] train_batch_sampler = paddle.io.BatchSampler( train_dataset, batch_size=args.batch_size, shuffle=True) dev_dataset = dev_dataset.apply(trans_func, lazy=True) dev_batch_sampler = paddle.io.BatchSampler( dev_dataset, batch_size=args.batch_size, shuffle=False) feed_list_name = [] # Define the input data and create the train/dev data_loader with paddle.static.program_guard(main_program, startup_program): [input_ids, segment_ids, labels] = create_data_holder() train_data_loader = DataLoader( dataset=train_dataset, feed_list=[input_ids, segment_ids, labels], batch_sampler=train_batch_sampler, collate_fn=batchify_fn, num_workers=0, return_list=False) dev_data_loader = DataLoader( dataset=dev_dataset, feed_list=[input_ids, segment_ids, labels], batch_sampler=dev_batch_sampler, collate_fn=batchify_fn, num_workers=0, return_list=False) # Create the training-forward program, and clone it for the validation with paddle.static.program_guard(main_program, startup_program): model, pretrained_state_dict = model_class.from_pretrained( args.model_name_or_path, num_classes=len(train_dataset.get_labels())) loss_fct = paddle.nn.loss.CrossEntropyLoss( ) if train_dataset.get_labels() else paddle.nn.loss.MSELoss() logits = model(input_ids, segment_ids) loss = loss_fct(logits, labels) dev_program = main_program.clone(for_test=True) # Create the training-backward program, this pass will not be # executed in the validation with paddle.static.program_guard(main_program, startup_program): lr_scheduler = paddle.optimizer.lr.LambdaDecay( args.learning_rate, lambda current_step, num_warmup_steps=args.warmup_steps, num_training_steps=args.max_steps if args.max_steps > 0 else (len(train_data_loader) * args.num_train_epochs): float( current_step) / float(max(1, num_warmup_steps)) if current_step < num_warmup_steps else max( 0.0, float(num_training_steps - current_step) / float( max(1, num_training_steps - num_warmup_steps)))) optimizer = paddle.optimizer.AdamW( learning_rate=lr_scheduler, epsilon=args.adam_epsilon, parameters=model.parameters(), weight_decay=args.weight_decay, apply_decay_param_fun=lambda x: x in [ p.name for n, p in model.named_parameters() if not any(nd in n for nd in ["bias", "norm"]) ]) optimizer.minimize(loss) # Create the metric pass for the validation with paddle.static.program_guard(dev_program, startup_program): metric = metric_class() correct = metric.compute(logits, labels) # Initialize the fine-tuning parameter, we will load the parameters in # pre-training model. And initialize the parameter which not in pre-training model # by the normal distribution. exe = paddle.static.Executor(place) exe.run(startup_program) state_dict = model.state_dict() reset_state_dict = reset_program_state_dict(model, state_dict, pretrained_state_dict) paddle.static.set_program_state(main_program, reset_state_dict) global_step = 0 tic_train = time.time() for epoch in range(args.num_train_epochs): for step, batch in enumerate(train_data_loader): global_step += 1 loss_return = exe.run(main_program, feed=batch, fetch_list=[loss]) if global_step % args.logging_steps == 0: logger.info( "global step %d, epoch: %d, batch: %d, loss: %f, speed: %.2f step/s" % (global_step, epoch, step, loss_return[0], args.logging_steps / (time.time() - tic_train))) tic_train = time.time() lr_scheduler.step() if global_step % args.save_steps == 0: # Validation pass, record the loss and metric evaluate(exe, metric, loss, correct, dev_program, dev_data_loader) output_dir = os.path.join(args.output_dir, "model_%d" % global_step) if not os.path.exists(output_dir): os.makedirs(output_dir) paddle.fluid.io.save_params(exe, output_dir) tokenizer.save_pretrained(output_dir) if __name__ == "__main__": args = parse_args() do_train(args)