""" This script provides an example to wrap TencentPretrain for text-to-text fine-tuning. """ import sys import os import random import argparse import torch tencentpretrain_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), "..")) sys.path.append(tencentpretrain_dir) from tencentpretrain.model_saver import save_model from tencentpretrain.decoders import * from tencentpretrain.targets import * from finetune.run_classifier import * class Text2text(torch.nn.Module): def __init__(self, args): super(Text2text, self).__init__() self.embedding = Embedding(args) for embedding_name in args.embedding: tmp_emb = str2embedding[embedding_name](args, len(args.tokenizer.vocab)) self.embedding.update(tmp_emb, embedding_name) self.encoder = str2encoder[args.encoder](args) self.tgt_embedding = Embedding(args) for embedding_name in args.tgt_embedding: tmp_emb = str2embedding[embedding_name](args, len(args.tokenizer.vocab)) self.tgt_embedding.update(tmp_emb, embedding_name) self.decoder = str2decoder[args.decoder](args) self.target = Target() self.target.update(LmTarget(args, len(args.tokenizer.vocab)), "lm") if args.tie_weights: self.target.lm.output_layer.weight = self.embedding.word.embedding.weight if args.share_embedding: self.tgt_embedding.word.embedding.weight = self.embedding.word.embedding.weight def encode(self, src, seg): emb = self.embedding(src, seg) memory_bank = self.encoder(emb, seg) return memory_bank def decode(self, src, memory_bank, tgt, tgt_seg): tgt_in, tgt_out, _ = tgt decoder_emb = self.tgt_embedding(tgt_in, tgt_seg) hidden = self.decoder(memory_bank, decoder_emb, (src,)) output = self.target.lm.output_layer(hidden) return output def forward(self, src, tgt, seg, tgt_seg, memory_bank=None, only_use_encoder=False): if only_use_encoder: return self.encode(src, seg) if memory_bank is not None: return self.decode(src, memory_bank, tgt, tgt_seg) tgt_in, tgt_out, _ = tgt memory_bank = self.encode(src, seg) if tgt_out is None: output = self.decode(src, memory_bank, tgt) return None, output else: decoder_emb = self.tgt_embedding(tgt_in, tgt_seg) hidden = self.decoder(memory_bank, decoder_emb, (seg,)) loss = self.target(hidden, tgt_out, None)[0] return loss, None def read_dataset(args, path): dataset, columns = [], {} with open(path, mode="r", encoding="utf-8") as f: for line_id, line in enumerate(f): if line_id == 0: for i, column_name in enumerate(line.rstrip("\r\n").split("\t")): columns[column_name] = i continue line = line.rstrip("\r\n").split("\t") if "text_b" in columns: text = line[columns["text_a"]] + SEP_TOKEN + line[columns["text_b"]] label = line[columns["label"]] else: text, label = line[columns["text_a"]], line[columns["label"]] src = args.tokenizer.convert_tokens_to_ids([CLS_TOKEN] + args.tokenizer.tokenize(text) + [SEP_TOKEN]) tgt_in = args.tokenizer.convert_tokens_to_ids([CLS_TOKEN] + args.tokenizer.tokenize(label) + [SEP_TOKEN]) PAD_ID = args.tokenizer.convert_tokens_to_ids([PAD_TOKEN])[0] seg = [1] * len(src) tgt_seg = [1] * len(tgt_in) if len(src) > args.seq_length: src = src[: args.seq_length] seg = seg[: args.seq_length] if len(tgt_in) > args.tgt_seq_length: tgt_in = tgt_in[: args.tgt_seq_length] tgt_seg = tgt_seg[: args.tgt_seq_length] tgt_out = tgt_in[1:] + [PAD_ID] while len(src) < args.seq_length: src.append(PAD_ID) seg.append(0) while len(tgt_in) < args.tgt_seq_length: tgt_in.append(PAD_ID) tgt_out.append(PAD_ID) tgt_seg.append(PAD_ID) dataset.append((src, tgt_in, tgt_out, seg, tgt_seg)) return dataset def batch_loader(batch_size, src, tgt_in, tgt_out, seg, tgt_seg): instances_num = src.size()[0] for i in range(instances_num // batch_size): src_batch = src[i * batch_size : (i + 1) * batch_size, :] tgt_in_batch = tgt_in[i * batch_size : (i + 1) * batch_size, :] tgt_out_batch = tgt_out[i * batch_size : (i + 1) * batch_size, :] seg_batch = seg[i * batch_size : (i + 1) * batch_size, :] tgt_seg_batch = tgt_seg[i * batch_size : (i + 1) * batch_size, :] yield src_batch, tgt_in_batch, tgt_out_batch, seg_batch, tgt_seg_batch if instances_num > instances_num // batch_size * batch_size: src_batch = src[instances_num // batch_size * batch_size :, :] tgt_in_batch = tgt_in[instances_num // batch_size * batch_size :, :] tgt_out_batch = tgt_out[instances_num // batch_size * batch_size :, :] seg_batch = seg[instances_num // batch_size * batch_size :, :] tgt_seg_batch = tgt_seg[instances_num // batch_size * batch_size :, :] yield src_batch, tgt_in_batch, tgt_out_batch, seg_batch, tgt_seg_batch def train_model(args, model, optimizer, scheduler, src_batch, tgt_in_batch, tgt_out_batch, seg_batch, tgt_seg_batch): model.zero_grad() src_batch = src_batch.to(args.device) tgt_in_batch = tgt_in_batch.to(args.device) tgt_out_batch = tgt_out_batch.to(args.device) seg_batch = seg_batch.to(args.device) tgt_seg_batch = tgt_seg_batch.to(args.device) loss, _ = model(src_batch, (tgt_in_batch, tgt_out_batch, src_batch), seg_batch, tgt_seg_batch) if torch.cuda.device_count() > 1: loss = torch.mean(loss) if args.fp16: with args.amp.scale_loss(loss, optimizer) as scaled_loss: scaled_loss.backward() else: loss.backward() optimizer.step() scheduler.step() return loss def evaluate(args, dataset): src = torch.LongTensor([example[0] for example in dataset]) tgt_in = torch.LongTensor([example[1] for example in dataset]) tgt_out = torch.LongTensor([example[2] for example in dataset]) seg = torch.LongTensor([example[3] for example in dataset]) tgt_seg = torch.LongTensor([example[4] for example in dataset]) generated_sentences = [] args.model.eval() for i, (src_batch, tgt_in_batch, tgt_out_batch, seg_batch, tgt_seg_batch) in enumerate(batch_loader(args.batch_size, src, tgt_in, tgt_out, seg, tgt_seg)): src_batch = src_batch.to(args.device) tgt_in_batch = torch.zeros(tgt_in_batch.size()[0], 1, dtype=torch.long, device=args.device) tgt_seg_batch = torch.ones(tgt_in_batch.size()[0], 1, dtype=torch.long, device=args.device) for j in range(tgt_in_batch.size()[0]): tgt_in_batch[j][-1] = args.tokenizer.vocab.get(CLS_TOKEN) seg_batch = seg_batch.to(args.device) with torch.no_grad(): memory_bank = args.model(src_batch, None, seg_batch, tgt_seg_batch, only_use_encoder=True) for _ in range(args.tgt_seq_length): tgt_out_batch = tgt_in_batch with torch.no_grad(): outputs = args.model(src_batch, (tgt_in_batch, tgt_out_batch, src_batch), None, tgt_seg_batch, memory_bank=memory_bank) next_token_logits = outputs[:, -1] next_tokens = torch.argmax(next_token_logits, dim=1).unsqueeze(1) tgt_in_batch = torch.cat([tgt_in_batch, next_tokens], dim=1) tgt_seg_batch = torch.ones(tgt_in_batch.size()[0], tgt_in_batch.size()[1], dtype=torch.long, device=args.device) for j in range(len(outputs)): sentence = " ".join([args.tokenizer.inv_vocab[token_id.item()] for token_id in tgt_in_batch[j][1:]]) generated_sentences.append(sentence) labels = {} labels_num = 0 for example in dataset: label = "".join([args.tokenizer.inv_vocab[token_id] for token_id in example[2][:-2]]).split(SEP_TOKEN)[0] if not labels.get(label, None): labels[label] = labels_num labels_num += 1 confusion_matrix = torch.zeros(labels_num, labels_num, dtype=torch.long) correct = 0 for i, example in enumerate(dataset): tgt = example[2] tgt_token = " ".join([args.tokenizer.inv_vocab[token_id] for token_id in tgt[:-2]]) generated_sentences[i] = generated_sentences[i].split(SEP_TOKEN)[0] pred = "".join(generated_sentences[i].split(" ")) gold = "".join(tgt_token.split(SEP_TOKEN)[0].split(" ")) if pred in labels.keys(): confusion_matrix[labels[pred], labels[gold]] += 1 if pred == gold: correct += 1 args.logger.info("Acc. (Correct/Total): {:.4f} ({}/{}) ".format(correct / len(dataset), correct, len(dataset))) return correct / len(dataset) def main(): parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter) finetune_opts(parser) tokenizer_opts(parser) parser.add_argument("--tgt_seq_length", type=int, default=32, help="Output sequence length.") args = parser.parse_args() # Load the hyperparameters from the config file. args = load_hyperparam(args) set_seed(args.seed) # Build tokenizer. args.tokenizer = str2tokenizer[args.tokenizer](args) # Build classification model. model = Text2text(args) # Load or initialize parameters. load_or_initialize_parameters(args, model) # Get logger. args.logger = init_logger(args) args.device = torch.device("cuda" if torch.cuda.is_available() else "cpu") model = model.to(args.device) # Training phase. trainset = read_dataset(args, args.train_path) instances_num = len(trainset) batch_size = args.batch_size args.train_steps = int(instances_num * args.epochs_num / batch_size) + 1 args.logger.info("Batch size: {}".format(batch_size)) args.logger.info("The number of training instances: {}".format(instances_num)) optimizer, scheduler = build_optimizer(args, model) if args.fp16: try: from apex import amp except ImportError: raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.") model, optimizer = amp.initialize(model, optimizer, opt_level=args.fp16_opt_level) args.amp = amp if torch.cuda.device_count() > 1: args.logger.info("{} GPUs are available. Let's use them.".format(torch.cuda.device_count())) model = torch.nn.DataParallel(model) args.model = model total_loss, result, best_result = 0.0, 0.0, 0.0 args.logger.info("Start training.") for epoch in range(1, args.epochs_num + 1): random.shuffle(trainset) src = torch.LongTensor([example[0] for example in trainset]) tgt_in = torch.LongTensor([example[1] for example in trainset]) tgt_out = torch.LongTensor([example[2] for example in trainset]) seg = torch.LongTensor([example[3] for example in trainset]) tgt_seg = torch.LongTensor([example[4] for example in trainset]) model.train() for i, (src_batch, tgt_in_batch, tgt_out_batch, seg_batch, tgt_seg_batch) in enumerate(batch_loader(batch_size, src, tgt_in, tgt_out, seg, tgt_seg)): loss = train_model(args, model, optimizer, scheduler, src_batch, tgt_in_batch, tgt_out_batch, seg_batch, tgt_seg_batch) total_loss += loss.item() if (i + 1) % args.report_steps == 0: args.logger.info("Epoch id: {}, Training steps: {}, Avg loss: {:.3f}".format(epoch, i + 1, total_loss / args.report_steps)) total_loss = 0.0 result = evaluate(args, read_dataset(args, args.dev_path)) if result > best_result: best_result = result save_model(model, args.output_model_path) # Evaluation phase. if args.test_path is not None: args.logger.info("Test set evaluation.") if torch.cuda.device_count() > 1: args.model.module.load_state_dict(torch.load(args.output_model_path)) else: args.model.load_state_dict(torch.load(args.output_model_path)) evaluate(args, read_dataset(args, args.test_path)) if __name__ == "__main__": main()