Keras-TextClassification/keras_textclassification/m08_TextVDCNN/train.py

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# -*- coding: UTF-8 -*-
# !/usr/bin/python
# @time :2019/6/8 14:37
# @author :Mo
# @function :train of VDCNN with baidu-qa-2019 in question title
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# 适配linux
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import pathlib
import sys
import os
project_path = str(pathlib.Path(os.path.abspath(__file__)).parent.parent.parent)
sys.path.append(project_path)
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# 地址
from keras_textclassification.conf.path_config import path_model, path_fineture, path_model_dir, path_hyper_parameters
# 训练验证数据地址
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from keras_textclassification.conf.path_config import path_baidu_qa_2019_train, path_baidu_qa_2019_valid
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# 数据预处理, 删除文件目录下文件
from keras_textclassification.data_preprocess.text_preprocess import PreprocessText, delete_file
# 模型图
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from keras_textclassification.m08_TextVDCNN.graph import VDCNNGraph as Graph
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# 计算时间
import time
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def train(hyper_parameters=None, rate=1.0):
if not hyper_parameters:
hyper_parameters = {
'len_max': 50, # 句子最大长度, 固定推荐20-50, bert越长会越慢, 占用空间也会变大, 本地win10-4G设为20就好, 过大小心OOM
'embed_size': 300, # 字/词向量维度, bert取768, word取300, char可以更小些
'vocab_size': 20000, # 这里随便填的,会根据代码里修改
'trainable': True, # embedding是静态的还是动态的, 即控制可不可以微调
'level_type': 'char', # 级别, 最小单元, 字/词, 填 'char' or 'word', 注意:word2vec模式下训练语料要首先切好
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'embedding_type': 'random', # 级别, 嵌入类型, 还可以填'xlnet'、'random'、 'bert'、 'albert' or 'word2vec"
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'gpu_memory_fraction': 0.66, #gpu使用率
'model': {'label': 17, # 类别数
'batch_size': 32, # 批处理尺寸, 感觉原则上越大越好,尤其是样本不均衡的时候, batch_size设置影响比较大
# only VDCNN
'top_k': 2, # k-max pooling
'pool_type': 'max', # 池化选择, 可以选"max"、"avg"、"conv"
'shortcut': True, # resnet方案
# 论文参数, 长文本, long sentence, ,max_len=256 or 1024 ans so on
'filters': [[64, 1], [128, 1], [256, 1], [512, 1]], # 9 layer, 256 len max
# 'filters': [[64, 2], [128, 2], [256, 2], [512, 2]], # 17 layer
# 'filters': [[64, 5], [128, 5], [256, 2], [512, 2]], # 29 layer
# 'filters': [[64, 8], [128, 8], [256, 5], [512, 3]], # 49 layer, 1024 len max
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# 自己设置的,效果不太佳, 短文本, short sentence, ,max_len=32 or 64 ans so on
# 'filters': [[3, 8], [6, 8], [12, 5], [24, 3]], # 49 layer
# 'filters': [[4, 8], [8, 8], [16, 5], [32, 3]], # 49 layer
# 'filters': [[3, 1], [6, 1], [12, 1], [24, 1]], # 9 layer
# 'filters': [[4, 1], [8, 1], [16, 1], [32, 1]], # 9 layer
'channel_size': 1, # CNN通道
'dropout': 0.32, # 随机失活, 概率
'decay_step': 100, # 学习率衰减step, 每N个step衰减一次
'decay_rate': 0.9, # 学习率衰减系数, 乘法
'epochs': 20, # 训练最大轮次
'patience': 3, # 早停,2-3就好
'lr': 1e-3, # 学习率,bert取5e-5,其他取1e-3, 对训练会有比较大的影响, 如果准确率一直上不去,可以考虑调这个参数
'l2': 1e-9, # l2正则化
'activate_classify': 'softmax', # 最后一个layer, 即分类激活函数
'loss': 'categorical_crossentropy', # 损失函数
'metrics': 'accuracy', # 保存更好模型的评价标准
'is_training': True, # 训练后者是测试模型
'model_path': path_model, # 模型地址, loss降低则保存的依据, save_best_only=True, save_weights_only=True
'path_hyper_parameters': path_hyper_parameters, # 模型(包括embedding),超参数地址,
'path_fineture': path_fineture, # 保存embedding trainable地址, 例如字向量、词向量、bert向量等
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},
'embedding': {'layer_indexes': [12], # bert取的层数
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# 'corpus_path': '', # embedding预训练数据地址,不配则会默认取conf里边默认的地址, keras-bert可以加载谷歌版bert,百度版ernie(需转换https://github.com/ArthurRizar/tensorflow_ernie),哈工大版bert-wwm(tf框架https://github.com/ymcui/Chinese-BERT-wwm)
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},
'data':{'train_data': path_baidu_qa_2019_train, # 训练数据
'val_data': path_baidu_qa_2019_valid # 验证数据
},
}
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# 删除先前存在的模型和embedding微调模型等
delete_file(path_model_dir)
time_start = time.time()
# graph初始化
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graph = Graph(hyper_parameters)
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print("graph init ok!")
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ra_ed = graph.word_embedding
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# 数据预处理
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pt = PreprocessText(path_model_dir)
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x_train, y_train = pt.preprocess_label_ques_to_idx(hyper_parameters['embedding_type'],
hyper_parameters['data']['train_data'],
ra_ed, rate=rate, shuffle=True)
x_val, y_val = pt.preprocess_label_ques_to_idx(hyper_parameters['embedding_type'],
hyper_parameters['data']['val_data'],
ra_ed, rate=rate, shuffle=True)
print("data propress ok!")
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print(len(y_train))
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# 训练
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graph.fit(x_train, y_train, x_val, y_val)
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print("耗时:" + str(time.time()-time_start))
if __name__=="__main__":
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train(rate=1)
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# 注意: 4G的1050Ti的GPU、win10下batch_size=32,len_max=20, gpu<=0.87, 应该就可以bert-fineture了。
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# 全量数据训练一轮(batch_size=32),就能达到80%准确率(验证集), 效果还是不错的
# win10下出现过错误,gpu、len_max、batch_size配小一点就好:ailed to allocate 3.56G (3822520832 bytes) from device: CUDA_ERROR_OUT_OF_MEMORY: out of memory
# 14251/14251 [==============================] - 47s 3ms/step - loss: 2.2805 - acc: 0.3443 - val_loss: 3.7807 - val_acc: 0.3808
# Epoch 00001: val_loss improved from inf to 3.78072, saving model to
# Epoch 2/20