Text Classification with CNN and RNN

使用卷积神经网络以及循环神经网络进行中文文本分类

CNN做句子分类的论文可以参看: Convolutional Neural Networks for Sentence Classification

还可以去读dennybritz大牛的博客：Implementing a CNN for Text Classification in TensorFlow

以及字符级CNN的论文：Character-level Convolutional Networks for Text Classification

本文是基于TensorFlow在中文数据集上的简化实现，使用了字符级CNN和RNN对中文文本进行分类，达到了较好的效果。

环境

• Python 3.5
• TensorFlow 1.3
• numpy
• scikit-learn

数据集

使用THUCNews的一个子集进行训练与测试，数据集请自行到THUCTC：一个高效的中文文本分类工具包下载，请遵循数据提供方的开源协议。

本次训练使用了其中的10个分类，每个分类6500条数据。

类别如下：

[code lang=text]
体育, 财经, 房产, 家居, 教育, 科技, 时尚, 时政, 游戏, 娱乐
[/code]

这个子集可以在此下载：链接:http://pan.baidu.com/s/1bpq9Eub 密码:ycyw

数据集划分如下：

• 训练集: 5000*10
• 验证集: 500*10
• 测试集: 1000*10

从原数据集生成子集的过程请参看helper下的两个脚本。其中，copy_data.sh用于从每个分类拷贝6500个文件，cnews_group.py用于将多个文件整合到一个文件中。执行该文件后，得到三个数据文件：

• cnews.train.txt: 训练集(50000条)
• cnews.val.txt: 验证集(5000条)
• cnews.test.txt: 测试集(10000条)

预处理

data/cnews_loader.py为数据的预处理文件。

• read_file(): 读取文件数据;
• build_vocab(): 构建词汇表，使用字符级的表示，这一函数会将词汇表存储下来，避免每一次重复处理;
• read_vocab(): 读取上一步存储的词汇表，转换为{词：id}表示;
• read_category(): 将分类目录固定，转换为{类别: id}表示;
• to_words(): 将一条由id表示的数据重新转换为文字;
• preocess_file(): 将数据集从文字转换为固定长度的id序列表示;
• batch_iter(): 为神经网络的训练准备经过shuffle的批次的数据。

经过数据预处理，数据的格式如下：

CNN卷积神经网络

配置项

CNN可配置的参数如下所示，在cnn_model.py中。

[code lang=python]
class TCNNConfig(object):
"""CNN配置参数"""

embedding_dim = 64 # 词向量维度
seq_length = 600 # 序列长度
num_classes = 10 # 类别数
num_filters = 128 # 卷积核数目
kernel_size = 5 # 卷积核尺寸
vocab_size = 5000 # 词汇表达小

hidden_dim = 128 # 全连接层神经元

dropout_keep_prob = 0.5 # dropout保留比例
learning_rate = 1e-3 # 学习率

batch_size = 64 # 每批训练大小
num_epochs = 10 # 总迭代轮次

print_per_batch = 100 # 每多少轮输出一次结果
save_per_batch = 10 # 每多少轮存入tensorboard
[/code]

CNN模型

具体参看cnn_model.py的实现。

大致结构如下：

训练与验证

运行 python run_cnn.py train，可以开始训练。

若之前进行过训练，请把tensorboard/textcnn删除，避免TensorBoard多次训练结果重叠。

[code lang=text]
Configuring CNN model…
Configuring TensorBoard and Saver…
Loading training and validation data…
Time usage: 0:00:14
Training and evaluating…
Epoch: 1
Iter: 0, Train Loss: 2.3, Train Acc: 10.94%, Val Loss: 2.3, Val Acc: 8.92%, Time: 0:00:01 *
Iter: 100, Train Loss: 0.88, Train Acc: 73.44%, Val Loss: 1.2, Val Acc: 68.46%, Time: 0:00:04 *
Iter: 200, Train Loss: 0.38, Train Acc: 92.19%, Val Loss: 0.75, Val Acc: 77.32%, Time: 0:00:07 *
Iter: 300, Train Loss: 0.22, Train Acc: 92.19%, Val Loss: 0.46, Val Acc: 87.08%, Time: 0:00:09 *
Iter: 400, Train Loss: 0.24, Train Acc: 90.62%, Val Loss: 0.4, Val Acc: 88.62%, Time: 0:00:12 *
Iter: 500, Train Loss: 0.16, Train Acc: 96.88%, Val Loss: 0.36, Val Acc: 90.38%, Time: 0:00:15 *
Iter: 600, Train Loss: 0.084, Train Acc: 96.88%, Val Loss: 0.35, Val Acc: 91.36%, Time: 0:00:17 *
Iter: 700, Train Loss: 0.21, Train Acc: 93.75%, Val Loss: 0.26, Val Acc: 92.58%, Time: 0:00:20 *
Epoch: 2
Iter: 800, Train Loss: 0.07, Train Acc: 98.44%, Val Loss: 0.24, Val Acc: 94.12%, Time: 0:00:23 *
Iter: 900, Train Loss: 0.092, Train Acc: 96.88%, Val Loss: 0.27, Val Acc: 92.86%, Time: 0:00:25
Iter: 1000, Train Loss: 0.17, Train Acc: 95.31%, Val Loss: 0.28, Val Acc: 92.82%, Time: 0:00:28
Iter: 1100, Train Loss: 0.2, Train Acc: 93.75%, Val Loss: 0.23, Val Acc: 93.26%, Time: 0:00:31
Iter: 1200, Train Loss: 0.081, Train Acc: 98.44%, Val Loss: 0.25, Val Acc: 92.96%, Time: 0:00:33
Iter: 1300, Train Loss: 0.052, Train Acc: 100.00%, Val Loss: 0.24, Val Acc: 93.58%, Time: 0:00:36
Iter: 1400, Train Loss: 0.1, Train Acc: 95.31%, Val Loss: 0.22, Val Acc: 94.12%, Time: 0:00:39
Iter: 1500, Train Loss: 0.12, Train Acc: 98.44%, Val Loss: 0.23, Val Acc: 93.58%, Time: 0:00:41
Epoch: 3
Iter: 1600, Train Loss: 0.1, Train Acc: 96.88%, Val Loss: 0.26, Val Acc: 92.34%, Time: 0:00:44
Iter: 1700, Train Loss: 0.018, Train Acc: 100.00%, Val Loss: 0.22, Val Acc: 93.46%, Time: 0:00:47
Iter: 1800, Train Loss: 0.036, Train Acc: 100.00%, Val Loss: 0.28, Val Acc: 92.72%, Time: 0:00:50
No optimization for a long time, auto-stopping…
[/code]

在验证集上的最佳效果为94.12%，且只经过了3轮迭代就已经停止。

测试

运行 python run_cnn.py test 在测试集上进行测试。

[code lang=text]
Configuring CNN model…
Loading test data…
Testing…
Test Loss: 0.14, Test Acc: 96.04%
Precision, Recall and F1-Score…
precision recall f1-score support

体育 0.99 0.99 0.99 1000
财经 0.96 0.99 0.97 1000
房产 1.00 1.00 1.00 1000
家居 0.95 0.91 0.93 1000
教育 0.95 0.89 0.92 1000
科技 0.94 0.97 0.95 1000
时尚 0.95 0.97 0.96 1000
时政 0.94 0.94 0.94 1000
游戏 0.97 0.96 0.97 1000
娱乐 0.95 0.98 0.97 1000

avg / total 0.96 0.96 0.96 10000

Confusion Matrix…
[[991 0 0 0 2 1 0 4 1 1]
[ 0 992 0 0 2 1 0 5 0 0]
[ 0 1 996 0 1 1 0 0 0 1]
[ 0 14 0 912 7 15 9 29 3 11]
[ 2 9 0 12 892 22 18 21 10 14]
[ 0 0 0 10 1 968 4 3 12 2]
[ 1 0 0 9 4 4 971 0 2 9]
[ 1 16 0 4 18 12 1 941 1 6]
[ 2 4 1 5 4 5 10 1 962 6]
[ 1 0 1 6 4 3 5 0 1 979]]
Time usage: 0:00:05
[/code]

在测试集上的准确率达到了96.04%，且各类的precision, recall和f1-score都超过了0.9。

从混淆矩阵也可以看出分类效果非常优秀。

RNN循环神经网络

配置项

RNN可配置的参数如下所示，在rnn_model.py中。

[code lang=python]
class TRNNConfig(object):
"""RNN配置参数"""

# 模型参数
embedding_dim = 64 # 词向量维度
seq_length = 600 # 序列长度
num_classes = 10 # 类别数
vocab_size = 5000 # 词汇表达小

num_layers= 2 # 隐藏层层数
hidden_dim = 128 # 隐藏层神经元
rnn = 'gru' # lstm 或 gru

dropout_keep_prob = 0.8 # dropout保留比例
learning_rate = 1e-3 # 学习率

batch_size = 128 # 每批训练大小
num_epochs = 10 # 总迭代轮次

print_per_batch = 100 # 每多少轮输出一次结果
save_per_batch = 10 # 每多少轮存入tensorboard
[/code]

RNN模型

具体参看rnn_model.py的实现。

大致结构如下：

训练与验证

这部分的代码与 run_cnn.py极为相似，只需要将模型和部分目录稍微修改。

运行 python run_rnn.py train，可以开始训练。

若之前进行过训练，请把tensorboard/textrnn删除，避免TensorBoard多次训练结果重叠。

[code lang=text]
Configuring RNN model…
Configuring TensorBoard and Saver…
Loading training and validation data…
Time usage: 0:00:14
Training and evaluating…
Epoch: 1
Iter: 0, Train Loss: 2.3, Train Acc: 8.59%, Val Loss: 2.3, Val Acc: 11.96%, Time: 0:00:08 *
Iter: 100, Train Loss: 0.95, Train Acc: 64.06%, Val Loss: 1.3, Val Acc: 53.06%, Time: 0:01:15 *
Iter: 200, Train Loss: 0.61, Train Acc: 79.69%, Val Loss: 0.94, Val Acc: 69.88%, Time: 0:02:22 *
Iter: 300, Train Loss: 0.49, Train Acc: 85.16%, Val Loss: 0.63, Val Acc: 81.44%, Time: 0:03:29 *
Epoch: 2
Iter: 400, Train Loss: 0.23, Train Acc: 92.97%, Val Loss: 0.6, Val Acc: 82.86%, Time: 0:04:36 *
Iter: 500, Train Loss: 0.27, Train Acc: 92.97%, Val Loss: 0.47, Val Acc: 86.72%, Time: 0:05:43 *
Iter: 600, Train Loss: 0.13, Train Acc: 98.44%, Val Loss: 0.43, Val Acc: 87.46%, Time: 0:06:50 *
Iter: 700, Train Loss: 0.24, Train Acc: 91.41%, Val Loss: 0.46, Val Acc: 87.12%, Time: 0:07:57
Epoch: 3
Iter: 800, Train Loss: 0.11, Train Acc: 96.09%, Val Loss: 0.49, Val Acc: 87.02%, Time: 0:09:03
Iter: 900, Train Loss: 0.15, Train Acc: 96.09%, Val Loss: 0.55, Val Acc: 85.86%, Time: 0:10:10
Iter: 1000, Train Loss: 0.17, Train Acc: 96.09%, Val Loss: 0.43, Val Acc: 89.44%, Time: 0:11:18 *
Iter: 1100, Train Loss: 0.25, Train Acc: 93.75%, Val Loss: 0.42, Val Acc: 88.98%, Time: 0:12:25
Epoch: 4
Iter: 1200, Train Loss: 0.14, Train Acc: 96.09%, Val Loss: 0.39, Val Acc: 89.82%, Time: 0:13:32 *
Iter: 1300, Train Loss: 0.2, Train Acc: 96.09%, Val Loss: 0.43, Val Acc: 88.68%, Time: 0:14:38
Iter: 1400, Train Loss: 0.012, Train Acc: 100.00%, Val Loss: 0.37, Val Acc: 90.58%, Time: 0:15:45 *
Iter: 1500, Train Loss: 0.15, Train Acc: 96.88%, Val Loss: 0.39, Val Acc: 90.58%, Time: 0:16:52
Epoch: 5
Iter: 1600, Train Loss: 0.075, Train Acc: 97.66%, Val Loss: 0.41, Val Acc: 89.90%, Time: 0:17:59
Iter: 1700, Train Loss: 0.042, Train Acc: 98.44%, Val Loss: 0.41, Val Acc: 90.08%, Time: 0:19:06
Iter: 1800, Train Loss: 0.08, Train Acc: 97.66%, Val Loss: 0.38, Val Acc: 91.36%, Time: 0:20:13 *
Iter: 1900, Train Loss: 0.089, Train Acc: 98.44%, Val Loss: 0.39, Val Acc: 90.18%, Time: 0:21:20
Epoch: 6
Iter: 2000, Train Loss: 0.092, Train Acc: 96.88%, Val Loss: 0.36, Val Acc: 91.42%, Time: 0:22:27 *
Iter: 2100, Train Loss: 0.062, Train Acc: 98.44%, Val Loss: 0.39, Val Acc: 90.56%, Time: 0:23:34
Iter: 2200, Train Loss: 0.053, Train Acc: 98.44%, Val Loss: 0.39, Val Acc: 90.02%, Time: 0:24:41
Iter: 2300, Train Loss: 0.12, Train Acc: 96.09%, Val Loss: 0.37, Val Acc: 90.84%, Time: 0:25:48
Epoch: 7
Iter: 2400, Train Loss: 0.014, Train Acc: 100.00%, Val Loss: 0.41, Val Acc: 90.38%, Time: 0:26:55
Iter: 2500, Train Loss: 0.14, Train Acc: 96.88%, Val Loss: 0.37, Val Acc: 91.22%, Time: 0:28:01
Iter: 2600, Train Loss: 0.11, Train Acc: 96.88%, Val Loss: 0.43, Val Acc: 89.76%, Time: 0:29:08
Iter: 2700, Train Loss: 0.089, Train Acc: 97.66%, Val Loss: 0.37, Val Acc: 91.18%, Time: 0:30:15
Epoch: 8
Iter: 2800, Train Loss: 0.0081, Train Acc: 100.00%, Val Loss: 0.44, Val Acc: 90.66%, Time: 0:31:22
Iter: 2900, Train Loss: 0.017, Train Acc: 100.00%, Val Loss: 0.44, Val Acc: 89.62%, Time: 0:32:29
Iter: 3000, Train Loss: 0.061, Train Acc: 96.88%, Val Loss: 0.43, Val Acc: 90.04%, Time: 0:33:36
No optimization for a long time, auto-stopping…
[/code]

在验证集上的最佳效果为91.42%，经过了8轮迭代停止，速度相比CNN慢很多。

准确率和误差如图所示：

测试

运行 python run_rnn.py test 在测试集上进行测试。

[code lang=text]
Testing…
Test Loss: 0.21, Test Acc: 94.22%
Precision, Recall and F1-Score…
precision recall f1-score support

体育 0.99 0.99 0.99 1000
财经 0.91 0.99 0.95 1000
房产 1.00 1.00 1.00 1000
家居 0.97 0.73 0.83 1000
教育 0.91 0.92 0.91 1000
科技 0.93 0.96 0.94 1000
时尚 0.89 0.97 0.93 1000
时政 0.93 0.93 0.93 1000
游戏 0.95 0.97 0.96 1000
娱乐 0.97 0.96 0.97 1000

avg / total 0.94 0.94 0.94 10000

Confusion Matrix…
[[988 0 0 0 4 0 2 0 5 1]
[ 0 990 1 1 1 1 0 6 0 0]
[ 0 2 996 1 1 0 0 0 0 0]
[ 2 71 1 731 51 20 88 28 3 5]
[ 1 3 0 7 918 23 4 31 9 4]
[ 1 3 0 3 0 964 3 5 21 0]
[ 1 0 1 7 1 3 972 0 6 9]
[ 0 16 0 0 22 26 0 931 2 3]
[ 2 3 0 0 2 2 12 0 972 7]
[ 0 3 1 1 7 3 11 5 9 960]]
Time usage: 0:00:33
[/code]

在测试集上的准确率达到了94.22%，且各类的precision, recall和f1-score，除了家居这一类别，都超过了0.9。

从混淆矩阵可以看出分类效果非常优秀。

对比两个模型，可见RNN除了在家居分类的表现不是很理想，其他几个类别较CNN差别不大。

还可以通过进一步的调节参数，来达到更好的效果。

项目地址：https://github.com/gaussic/text-classification-cnn-rnn