基于paddlepaddle的文本分类
0.数据介绍
数据来源:从网站上爬取56821条数据中文新闻摘要。数据内容:包含10种类别,国际、文化、娱乐、体育、财经、汽车、教育、科技、房产、证券。
1、准备数据:
创建数据集和数据字典
创建数据读取器train_reader 和test_reader
2、配置网络
定义网络
定义损失函数
定义优化算法
3、训练网络
4、模型评估
5、模型预测
6.源代码:
# 导入必要的包
import os
from multiprocessing import cpu_count
import numpy as np
import shutil
import paddle
import paddle.fluid as fluid
data_root_path='/home/aistudio/data/'
# 创建创建序列化表示的数据
def create_data_list(data_root_path):
with open(data_root_path + 'test_list.txt', 'w') as f:
pass
with open(data_root_path + 'train_list.txt', 'w') as f:
pass
with open(os.path.join(data_root_path, 'dict_txt.txt'), 'r', encoding='utf-8') as f_data:
dict_txt = eval(f_data.readlines()[0])
with open(os.path.join(data_root_path, 'news_classify_data.txt'), 'r', encoding='utf-8') as f_data:
lines = f_data.readlines()
i = 0
for line in lines:
title = line.split('_!_')[-1].replace('\n', '')
l = line.split('_!_')[1]
labs = ""
if i % 10 == 0:
with open(os.path.join(data_root_path, 'test_list.txt'), 'a', encoding='utf-8') as f_test:
for s in title:
lab = str(dict_txt[s])
labs = labs + lab + ','
labs = labs[:-1]
labs = labs + '\t' + l + '\n'
f_test.write(labs)
else:
with open(os.path.join(data_root_path, 'train_list.txt'), 'a', encoding='utf-8') as f_train:
for s in title:
lab = str(dict_txt[s])
labs = labs + lab + ','
labs = labs[:-1]
labs = labs + '\t' + l + '\n'
f_train.write(labs)
i += 1
print("数据列表生成完成!")
# 生成数据字典
def create_dict(data_path, dict_path):
dict_set = set()
# 读取已经下载得数据
with open(data_path, 'r', encoding='utf-8') as f:
lines = f.readlines()
# 把数据生成一个元组
for line in lines:
title = line.split('_!_')[-1].replace('\n', '')
for s in title:
dict_set.add(s)
# 把元组转换成字典,一个字对应一个数字
dict_list = []
i = 0
for s in dict_set:
dict_list.append([s, i])
i += 1
# 添加未知字符
dict_txt = dict(dict_list)
end_dict = {"<unk>": i}
dict_txt.update(end_dict)
# 把这些字典保存到本地中
with open(dict_path, 'w', encoding='utf-8') as f:
f.write(str(dict_txt))
print("数据字典生成完成!")
# 获取字典的长度
def get_dict_len(dict_path):
with open(dict_path, 'r', encoding='utf-8') as f:
line = eval(f.readlines()[0])
return len(line.keys())
if __name__ == '__main__':
# 把生产的数据列表都放在自己的总类别文件夹中
data_root_path = "/home/aistudio/data/"
data_path = os.path.join(data_root_path, 'news_classify_data.txt')
dict_path = os.path.join(data_root_path, "dict_txt.txt")
# 创建数据字典
create_dict(data_path, dict_path)
# 创建数据列表
create_data_list(data_root_path)
# 创建数据读取器train_reader 和test_reader
# 训练/测试数据的预处理
def data_mapper(sample):
data, label = sample
data = [int(data) for data in data.split(',')]
return data, int(label)
# 创建数据读取器train_reader
def train_reader(train_list_path):
def reader():
with open(train_list_path, 'r') as f:
lines = f.readlines()
# 打乱数据
np.random.shuffle(lines)
# 开始获取每张图像和标签
for line in lines:
data, label = line.split('\t')
yield data, label
return paddle.reader.xmap_readers(data_mapper, reader, cpu_count(), 1024) #cpu_count() 返回值为核数,1024 为存有待读取数据的队列的大小
# 创建数据读取器test_reader
def test_reader(test_list_path):
def reader():
with open(test_list_path, 'r') as f:
lines = f.readlines()
for line in lines:
data, label = line.split('\t')
yield data, label
# 创建CNN网络
def CNN_net(data,dict_dim, class_dim=, emb_dim=, hid_dim=,hid_dim2=):
emb = fluid.layers.embedding(input=data,
size= )
conv_3 = fluid.nets.sequence_conv_pool(
input=,
num_filters=,
filter_size=,
act=,
pool_type=)
conv_4 = fluid.nets.sequence_conv_pool(
input=,
num_filters=,
filter_size=,
act=,
pool_type=)
output = fluid.layers.fc(
input=, size=, act=)
return output
return paddle.reader.xmap_readers(data_mapper, reader, cpu_count(), 1024)
# 定义输入数据, lod_level不为0指定输入数据为序列数据
words = fluid.layers.data(name='words', shape=[1], dtype='int64', lod_level=1)
label = fluid.layers.data(name='label', shape=[1], dtype='int64')
# 获取数据字典长度
dict_dim = get_dict_len('/home/aistudio/data/dict_txt.txt')
# 获取卷积神经网络
# model = CNN_net(words, dict_dim, 15)
# 获取分类器
model = CNN_net(words, dict_dim)
# 获取损失函数和准确率
cost = fluid.layers.cross_entropy(input=model, label=label)
avg_cost = fluid.layers.mean(cost)
acc = fluid.layers.accuracy(input=model, label=label)
# 获取预测程序
test_program = fluid.default_main_program().clone(for_test=True)
# 定义优化方法
optimizer = fluid.optimizer.AdagradOptimizer(learning_rate=)
opt = optimizer.minimize(avg_cost)
# 创建一个执行器,CPU训练速度比较慢
place = fluid.CPUPlace()
# place = fluid.CUDAPlace(0)
exe = fluid.Executor(place)
# 进行参数初始化
exe.run(fluid.default_startup_program())
# 获取训练数据读取器和测试数据读取器
train_reader = paddle.batch(reader=train_reader('/home/aistudio/data/train_list.txt'), batch_size=128)
test_reader = paddle.batch(reader=test_reader('/home/aistudio/data/test_list.txt'), batch_size=128)
# 定义数据映射器
feeder = fluid.DataFeeder(place=place, feed_list=[words, label])
EPOCH_NUM=10
model_save_dir = '/home/aistudio/work/infer_model/'
# 开始训练
for pass_id in range(EPOCH_NUM):
# 进行训练
for batch_id, data in enumerate(train_reader()):
train_cost, train_acc = exe.run(program=fluid.default_main_program(),
feed=feeder.feed(data),
fetch_list=[avg_cost, acc])
if batch_id % 100 == 0:
print('Pass:%d, Batch:%d, Cost:%0.5f, Acc:%0.5f' % (pass_id, batch_id, train_cost[0], train_acc[0]))
# 进行测试
test_costs = []
test_accs = []
for batch_id, data in enumerate(test_reader()):
test_cost, test_acc = exe.run(program=,
feed=feeder.feed(),
fetch_list=[, ])
test_costs.append(test_cost[0])
test_accs.append(test_acc[0])
# 计算平均预测损失在和准确率
test_cost = (sum(test_costs) / len(test_costs))
test_acc = (sum(test_accs) / len(test_accs))
print('Test:%d, Cost:%0.5f, ACC:%0.5f' % (pass_id, test_cost, test_acc))
# 保存预测模型
if not os.path.exists(model_save_dir):
os.makedirs(model_save_dir)
fluid.io.save_inference_model(model_save_dir,
feeded_var_names=[words.name],
target_vars=[model],
executor=exe)
print('训练模型保存完成!')
# 用训练好的模型进行预测并输出预测结果
# 创建执行器
place = fluid.CPUPlace()
# place = fluid.CUDAPlace(0)
infer_exe = fluid.Executor(place)
infer_exe.run(fluid.default_startup_program())
save_path = '/home/aistudio/work/infer_model/'
# 从模型中获取预测程序、输入数据名称列表、分类器
[infer_program, feeded_var_names, target_var] = fluid.io.load_inference_model(dirname=save_path, executor=infer_exe)
# 获取数据
def get_data(sentence):
# 读取数据字典
with open('/home/aistudio/data/dict_txt.txt', 'r', encoding='utf-8') as f_data:
dict_txt = eval(f_data.readlines()[0])
dict_txt = dict(dict_txt)
# 把字符串数据转换成列表数据
keys = dict_txt.keys()
data = []
for s in sentence:
# 判断是否存在未知字符
if not s in keys:
s = '<unk>'
data.append(int(dict_txt[s]))
return data
data = []
# 获取图片数据
data1 = get_data('在获得诺贝尔文学奖7年之后,莫言15日晚间在山西汾阳贾家庄如是说')
data2 = get_data('综合“今日美国”、《世界日报》等当地媒体报道,芝加哥河滨警察局表示,')
data.append(data1)
data.append(data2)
# 获取每句话的单词数量
base_shape = [[len(c) for c in data]]
# 生成预测数据
tensor_words = fluid.create_lod_tensor(data, base_shape, place)
# 执行预测
result = exe.run(program=infer_program,
feed={feeded_var_names[0]: tensor_words},
fetch_list=target_var)
# 分类名称
names = [ '文化', '娱乐', '体育', '财经','房产', '汽车', '教育', '科技', '国际', '证券']
# 获取结果概率最大的label
for i in range(len(data)):
lab = np.argsort(result)[0][i][-1]
print('预测结果标签为:%d, 名称为:%s, 概率为:%f' % (lab, names[lab], result[0][i][lab]))
####结果
预测结果标签为:0, 名称为:文化, 概率为:0.904787 预测结果标签为:8, 名称为:国际, 概率为:0.540232
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