用python写一维卷积降噪自编码器代码用于分类
时间: 2023-06-12 14:07:23 浏览: 136
以下是一维卷积降噪自编码器的Python代码,用于对时序数据进行分类任务:
```python
import numpy as np
import tensorflow as tf
from tensorflow.keras.layers import Input, Conv1D, MaxPooling1D, UpSampling1D, Flatten, Dense, Reshape
from tensorflow.keras.models import Model
# 定义输入层
input_data = Input(shape=(100, 1))
# 定义编码器
encoded = Conv1D(32, 3, activation='relu', padding='same')(input_data)
encoded = MaxPooling1D(2, padding='same')(encoded)
encoded = Conv1D(16, 3, activation='relu', padding='same')(encoded)
encoded = MaxPooling1D(2, padding='same')(encoded)
encoded = Conv1D(8, 3, activation='relu', padding='same')(encoded)
encoded = MaxPooling1D(2, padding='same')(encoded)
# 定义解码器
decoded = Conv1D(8, 3, activation='relu', padding='same')(encoded)
decoded = UpSampling1D(2)(decoded)
decoded = Conv1D(16, 3, activation='relu', padding='same')(decoded)
decoded = UpSampling1D(2)(decoded)
decoded = Conv1D(32, 3, activation='relu')(decoded)
decoded = UpSampling1D(2)(decoded)
decoded = Conv1D(1, 3, activation='sigmoid', padding='same')(decoded)
# 定义自编码器
autoencoder = Model(input_data, decoded)
# 定义分类器
x = Flatten()(encoded)
x = Dense(32, activation='relu')(x)
x = Dense(16, activation='relu')(x)
output = Dense(10, activation='softmax')(x)
classifier = Model(input_data, output)
# 编译模型
autoencoder.compile(optimizer='adam', loss='binary_crossentropy')
classifier.compile(optimizer='adam', loss='categorical_crossentropy', metrics=['accuracy'])
# 生成随机数据
data = np.random.rand(100, 100, 1)
# 训练自编码器和分类器
autoencoder.fit(data, data, epochs=10)
classifier.fit(data, np.random.randint(0, 10, (100, 10)), epochs=10)
```
在以上代码中,我们定义了一个一维卷积降噪自编码器,通过编码器将输入数据进行降维压缩,然后通过解码器进行重构,以实现降噪的效果。然后,我们在编码器的输出上添加了一个分类器,用于对时序数据进行分类任务。我们通过编译自编码器和分类器,然后使用`fit`方法对其进行训练。
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