fix
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tlk-dsg
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0e61eed58b
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94d23febef
200
tools/trainer.py
200
tools/trainer.py
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@ -1,113 +1,117 @@
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import torch
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import logging
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from collections import OrderedDict
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from typing import Sequence, Optional
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import matplotlib.pyplot as plt
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from metrics import PRMetric
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logger = logging.getLogger(__name__)
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SPECIAL_TOKENS_KEYS = [
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"pad_token",
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"unk_token",
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"mask_token",
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"cls_token",
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"sep_token",
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"bos_token",
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"eos_token",
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"head_token",
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"tail_token",
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]
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SPECIAL_TOKENS_VALUES = [
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"[PAD]",
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"[UNK]",
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"[MASK]",
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"[CLS]",
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"[SEP]",
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"[BOS]",
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"[EOS]",
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"HEAD",
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"TAIL",
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]
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SPECIAL_TOKENS = OrderedDict(zip(SPECIAL_TOKENS_KEYS, SPECIAL_TOKENS_VALUES))
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class Vocab(object):
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def train(epoch, model, dataloader, optimizer, criterion, device, writer, cfg):
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"""
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构建词汇表,增加词汇，删除低频词汇
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training the model.
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Args:
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epoch (int): number of training steps.
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model (class): model of training.
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dataloader (dict): dict of dataset iterator. Keys are tasknames, values are corresponding dataloaders.
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optimizer (Callable): optimizer of training.
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criterion (Callable): loss criterion of training.
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device (torch.device): device of training.
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writer (class): output to tensorboard.
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cfg: configutation of training.
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Return:
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losses[-1] : the loss of training
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"""
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def __init__(self, name: str = 'basic', init_tokens: Sequence = SPECIAL_TOKENS):
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self.name = name
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self.init_tokens = init_tokens
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self.trimed = False
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self.word2idx = {}
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self.word2count = {}
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self.idx2word = {}
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self.count = 0
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self._add_init_tokens()
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model.train()
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def _add_init_tokens(self):
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"""
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添加初始tokens
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"""
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for token in self.init_tokens.values():
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self._add_word(token)
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metric = PRMetric()
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losses = []
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def _add_word(self, word: str):
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"""
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增加单个词汇
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Arg :
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word (String) : 增加的词汇
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"""
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if word not in self.word2idx:
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self.word2idx[word] = self.count
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self.word2count[word] = 1
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self.idx2word[self.count] = word
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self.count += 1
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for batch_idx, (x, y) in enumerate(dataloader, 1):
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for key, value in x.items():
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x[key] = value.to(device)
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y = y.to(device)
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optimizer.zero_grad()
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y_pred = model(x)
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if cfg.model_name == 'capsule':
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loss = model.loss(y_pred, y)
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else:
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self.word2count[word] += 1
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loss = criterion(y_pred, y)
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def add_words(self, words: Sequence):
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"""
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通过数组增加词汇
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Arg :
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words (List) : 增加的词汇组
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"""
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for word in words:
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self._add_word(word)
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loss.backward()
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optimizer.step()
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def trim(self, min_freq=2, verbose: Optional[bool] = True):
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"""
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当 word 词频低于 min_freq 时，从词库中删除
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Args:
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min_freq (int): 最低词频
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verbose (bool) : 是否打印日志
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"""
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assert min_freq == int(min_freq), f'min_freq must be integer, can\'t be {min_freq}'
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min_freq = int(min_freq)
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if min_freq < 2:
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return
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if self.trimed:
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return
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self.trimed = True
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metric.update(y_true=y, y_pred=y_pred)
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losses.append(loss.item())
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keep_words = []
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new_words = []
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data_total = len(dataloader.dataset)
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data_cal = data_total if batch_idx == len(dataloader) else batch_idx * len(y)
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if (cfg.train_log and batch_idx % cfg.log_interval == 0) or batch_idx == len(dataloader):
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# p r f1 皆为 macro，因为micro时三者相同，定义为acc
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acc, p, r, f1 = metric.compute()
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logger.info(f'Train Epoch {epoch}: [{data_cal}/{data_total} ({100. * data_cal / data_total:.0f}%)]\t'
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f'Loss: {loss.item():.6f}')
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logger.info(f'Train Epoch {epoch}: Acc: {100. * acc:.2f}%\t'
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f'macro metrics: [p: {p:.4f}, r:{r:.4f}, f1:{f1:.4f}]')
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for k, v in self.word2count.items():
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if v >= min_freq:
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keep_words.append(k)
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new_words.extend([k] * v)
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if verbose:
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before_len = len(keep_words)
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after_len = len(self.word2idx) - len(self.init_tokens)
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logger.info('vocab after be trimmed, keep words [{} / {}] = {:.2f}%'.format(
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before_len, after_len, before_len / after_len * 100))
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if cfg.show_plot and not cfg.only_comparison_plot:
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if cfg.plot_utils == 'matplot':
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plt.plot(losses)
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plt.title(f'epoch {epoch} train loss')
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plt.show()
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# Reinitialize dictionaries
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self.word2idx = {}
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self.word2count = {}
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self.idx2word = {}
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self.count = 0
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self._add_init_tokens()
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self.add_words(new_words)
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if cfg.plot_utils == 'tensorboard':
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for i in range(len(losses)):
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writer.add_scalar(f'epoch_{epoch}_training_loss', losses[i], i)
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return losses[-1]
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def validate(epoch, model, dataloader, criterion, device, cfg):
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"""
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validating the model.
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Args:
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epoch (int): number of validating steps.
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model (class): model of validating.
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dataloader (dict): dict of dataset iterator. Keys are tasknames, values are corresponding dataloaders.
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criterion (Callable): loss criterion of validating.
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device (torch.device): device of validating.
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cfg: configutation of validating.
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Return:
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f1 : f1 score
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loss : the loss of validating
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"""
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model.eval()
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metric = PRMetric()
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losses = []
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for batch_idx, (x, y) in enumerate(dataloader, 1):
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for key, value in x.items():
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x[key] = value.to(device)
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y = y.to(device)
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with torch.no_grad():
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y_pred = model(x)
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if cfg.model_name == 'capsule':
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loss = model.loss(y_pred, y)
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else:
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loss = criterion(y_pred, y)
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metric.update(y_true=y, y_pred=y_pred)
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losses.append(loss.item())
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loss = sum(losses) / len(losses)
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acc, p, r, f1 = metric.compute()
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data_total = len(dataloader.dataset)
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if epoch >= 0:
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logger.info(f'Valid Epoch {epoch}: [{data_total}/{data_total}](100%)\t Loss: {loss:.6f}')
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logger.info(f'Valid Epoch {epoch}: Acc: {100. * acc:.2f}%\tmacro metrics: [p: {p:.4f}, r:{r:.4f}, f1:{f1:.4f}]')
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else:
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logger.info(f'Test Data: [{data_total}/{data_total}](100%)\t Loss: {loss:.6f}')
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logger.info(f'Test Data: Acc: {100. * acc:.2f}%\tmacro metrics: [p: {p:.4f}, r:{r:.4f}, f1:{f1:.4f}]')
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return f1, loss
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