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220 lines
9.5 KiB
Python
220 lines
9.5 KiB
Python
import torch
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from tqdm import tqdm
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from config import BiLSTMCRFTrainConfig, BiLSTMConfig
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from models.BiLSTM_CRF import BiLSTM_CRF
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from utils.utils import expand_vocabulary
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from evaluating import Metrics
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class BiLSTM_CRF_opration:
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def __init__(self, train_data, dev_data, test_data, word2id, tag2id):
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self.train_word_lists, self.train_tag_lists = train_data
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self.dev_word_lists, self.dev_tag_lists = dev_data
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self.test_word_lists, self.test_tag_lists = test_data
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self.word2id, self.tag2id = expand_vocabulary(word2id, tag2id, crf=True)
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self.id2tag = dict((id, tag) for tag, id in tag2id.items())
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# self.id2tag = dict()
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# for tag, id in tag2id.items():
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# if tag != '<start>' and tag != '<end>':
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# self.id2tag[id] = tag
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self.device = 'cuda:0' if torch.cuda.is_available() else 'cpu'
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# self.device = 'cpu'
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self.model = BiLSTM_CRF(
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vocab_size=len(self.word2id),
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tagset_size=len(self.tag2id),
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config=BiLSTMConfig,
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tag2id=tag2id
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).to(self.device)
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self.optimizer = torch.optim.Adam(params=self.model.parameters(), lr=BiLSTMCRFTrainConfig.lr)
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def _sort_by_sentence_lengths(self, word_lists, tag_lists):
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"""将 word_lists和tag_lists 根据sentence序列的长度
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降序排序, 此举可以有效保证每个batch中的sentence序列
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长度相近, 减少< pad> 占位符的用量
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"""
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pairs = list(zip(word_lists, tag_lists))
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indices = sorted(range(len(pairs)), key=lambda x:len(pairs[x][0]), reverse=True)
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pairs = [pairs[i] for i in indices]
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word_lists, tag_lists = list(zip(*pairs))
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return word_lists, tag_lists
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def _tokenizer(self, word_lists, tag_lists=None):
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"""将 word和tag 转换为 词表(word2id)和标签表(tag2id)中对应的id
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:params word_lists 文本（以单个汉字为单位）序列 类型: python.List
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:params tag_lists 标签序列 类型: python.List
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:return wordID_lists 文本id序列 类型: pytorch.LongTensor
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:return tagID_lists 标签id序列 类型: pytorch.LongTensor
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"""
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if tag_lists is None:
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# 用于 predict函数
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assert len(word_lists == 1)
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sentence = word_lists[0]
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wordID_lists = torch.LongTensor(size=(1, len(sentence))).to(self.device)
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for i, word in enumerate(sentence):
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wordID_lists[0][i] = self.word2id.get(word, self.word2id['<unk>'])
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return wordID_lists
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else:
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# 用于 train、validate、evaluate函数
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# print(word_lists)
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wordID_lists = (torch.ones(size=(len(word_lists), len(word_lists[0])), dtype=torch.long) * self.word2id['<pad>']).to(self.device)
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tagID_lists = (torch.ones(size=(len(tag_lists), len(tag_lists[0])), dtype=torch.long) * self.tag2id['<pad>']).to(self.device)
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for i in range(len(tag_lists)):
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for j in range(len(tag_lists[i])):
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wordID_lists[i][j] = self.word2id.get(word_lists[i][j], self.word2id['<unk>']) # 遇到词表中不存在的字符，使用<unk>代替
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tagID_lists[i][j] = self.tag2id[tag_lists[i][j]]
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wordID_lists[i][-1] = self.word2id.get(word_lists[i][-1], self.word2id['<unk>'])
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return wordID_lists, tagID_lists
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def _predtion_to_tags(self, prediction):
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"""将模型给出的预测结果转化为标签序列"""
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# return [self.id2tag[id.item()] for id in torch.argmax(prediction, dim=2)[0]]
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return [self.id2tag.get(id, 'O') for id in prediction]
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def train(self):
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"""训练
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数据以batch的形式输入模型, 同一个batch中的序列使
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用<pad>填补至与该batch中最长序列相同的长度, 故每
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个batch的序列长度为不同"""
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# 根据sentence的长度 重排train_data
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# 此举可以减少同一个batch中的每个sentence之间
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# 的长度差距，这意味只需添加最少数量的 <pad>
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train_word_lists, train_tag_lists = self._sort_by_sentence_lengths(self.train_word_lists, self.train_tag_lists)
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epochs = BiLSTMCRFTrainConfig.epochs
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batch_size = BiLSTMCRFTrainConfig.batch_size
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iteration_size = round(len(train_word_lists) / batch_size + 0.49)
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for epoch in range(epochs):
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# for epoch in range(1):
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losses = 0.
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with tqdm(total=iteration_size, desc='Epoch %d/%d Training' %(epoch, epochs)) as pbar:
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# one batch
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for step in range(iteration_size):
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# batch data
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batch_sentences, batch_targets = self._tokenizer(
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train_word_lists[batch_size * step: min(batch_size * (step+1), len(train_word_lists))],
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train_tag_lists[batch_size * step: min(batch_size * (step+1), len(train_tag_lists))]
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)
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# forword
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self.model.train()
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self.model.zero_grad()
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prediction = self.model.forward(batch_sentences)
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# loss
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loss = self.model.loss(prediction, batch_targets).to(self.device)
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loss.backward()
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self.optimizer.step()
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losses += loss.item()
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if step % 2 == 0 and step != 0: pbar.set_postfix(ave_loss=losses/(step+1))
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pbar.update(1)
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# 每个epoch结束后，使用验证集测试
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val_loss = self.validate(batch_size)
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pbar.set_postfix(ave_loss='{0:.3f}'.format(losses/iteration_size), val_loss='{0:.3f}'.format(val_loss))
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def validate(self, batch_size):
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"""验证
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数据以batch的形式输入模型, 同一个batch中的序列使
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用<pad>填补至与该batch中最长序列相同的长度, 故每
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个batch的序列长度为不同"""
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dev_word_lists, dev_tag_lists = self._sort_by_sentence_lengths(self.dev_word_lists, self.dev_tag_lists)
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# print(dev_word_lists)
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self.model.eval()
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with torch.no_grad():
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val_losses = 0
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iteration_size = round(len(self.dev_word_lists) / batch_size + 0.5)
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for step in range(iteration_size):
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# validate batch data
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val_sentences, val_targets = self._tokenizer(
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dev_word_lists[batch_size * step: min(batch_size * (step+1), len(dev_word_lists))],
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dev_tag_lists[batch_size * step: min(batch_size * (step+1), len(dev_tag_lists))]
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)
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# forward
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prediction = self.model.forward(val_sentences)
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# loss
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loss = self.model.loss(prediction, val_targets).to(self.device)
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val_losses += loss.item()
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val_losses = val_losses / iteration_size
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return val_losses
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def evaluate(self, file_path: str):
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"""评估
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一个batch只有一条序列, 无需<pad>"""
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self.model.eval()
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with torch.no_grad():
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pred_tag_lists = []
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for i, (word_list, tag_list) in enumerate(zip(self.test_word_lists, self.test_tag_lists)):
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# test data
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wordID_list, tagID_list = self._tokenizer([word_list], [tag_list])
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# forward
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prediction = self.model.forward(wordID_list)
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# loss
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# loss = cal_bilstm_crf_loss(prediction, tagID_list, self.tag2id)
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# if i % 100 == 0: print(f'{i}/{len(self.test_word_lists)} : loss={loss}')
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best_path = self.model.viterbi_decoding(prediction[0])
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pred_tag_lists.append(
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self._predtion_to_tags(
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best_path
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)
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)
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# print(word_list)
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# print(tag_list)
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# print(self._predtion_to_tags(
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# best_path
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# ))
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# 计算评估值
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metrics = Metrics(file_path, self.test_tag_lists, pred_tag_lists)
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metrics.report_scores(dtype='BiLSTM-CRF')
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def predict(self, sentence):
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"""预测
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: params sentence 单个文本"""
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sentence_token = self._tokenizer([sentence])
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torch.no_grad()
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prediction = self.model.forward(sentence_token)
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pred_tags = self._predtion_to_tags(prediction)
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return pred_tags, prediction
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if __name__ == '__main__':
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from data import build_corpus
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from utils.utils import add_end_tag
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train_word_lists, train_tag_lists, word2id, tag2id = build_corpus("train")
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dev_word_lists, dev_tag_lists = build_corpus("dev", make_vocab=False)
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test_word_lists, test_tag_lists = build_corpus("test", make_vocab=False)
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train_word_lists, train_tag_lists = add_end_tag(train_word_lists, train_tag_lists)
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dev_word_lists, dev_tag_lists = add_end_tag(dev_word_lists, dev_tag_lists)
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test_word_lists = add_end_tag(test_word_lists)
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bilstm_opration = BiLSTM_CRF_opration(
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train_data=(train_word_lists, train_tag_lists),
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dev_data=(dev_word_lists, dev_tag_lists),
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test_data=(test_word_lists, test_tag_lists),
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word2id=word2id,
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tag2id=tag2id
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)
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bilstm_opration.train()
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bilstm_opration.evaluate(file_path='./zdata') |