利用BP神经网络预测房价,并给出python代码
时间: 2023-07-12 13:11:51 浏览: 153
好的,利用BP神经网络预测房价,我们可以按照以下步骤进行:
1. 收集数据集
2. 数据预处理
3. 构建BP神经网络模型
4. 训练模型
5. 测试模型
下面是基于Python的代码实现:
1. 收集数据集
我们可以从公开数据集中获取房价数据,例如使用sklearn中自带的波士顿房价数据集。
```python
from sklearn.datasets import load_boston
boston = load_boston()
X = boston.data
y = boston.target
```
2. 数据预处理
我们需要对数据进行标准化处理,让所有特征处于同一规模范围内。
```python
from sklearn.preprocessing import StandardScaler
scaler = StandardScaler()
X = scaler.fit_transform(X)
```
3. 构建BP神经网络模型
我们使用Keras构建BP神经网络模型。
```python
from keras.models import Sequential
from keras.layers import Dense
model = Sequential()
model.add(Dense(13, input_dim=13, activation='relu'))
model.add(Dense(6, activation='relu'))
model.add(Dense(1, activation='linear'))
```
4. 训练模型
我们使用adam优化器和均方误差损失函数训练模型。
```python
model.compile(loss='mse', optimizer='adam')
model.fit(X, y, epochs=100, batch_size=10)
```
5. 测试模型
我们将模型用于预测新的房价数据,并输出预测结果。
```python
import numpy as np
new_data = np.array([[0.1, 18.0, 2.31, 0.0, 0.538, 6.575, 65.2, 4.0900, 1.0, 296.0, 15.3, 396.9, 4.98]])
new_data = scaler.transform(new_data)
prediction = model.predict(new_data)
print(prediction[0][0])
```
完整代码如下:
```python
from sklearn.datasets import load_boston
from sklearn.preprocessing import StandardScaler
from keras.models import Sequential
from keras.layers import Dense
import numpy as np
# 收集数据集
boston = load_boston()
X = boston.data
y = boston.target
# 数据预处理
scaler = StandardScaler()
X = scaler.fit_transform(X)
# 构建BP神经网络模型
model = Sequential()
model.add(Dense(13, input_dim=13, activation='relu'))
model.add(Dense(6, activation='relu'))
model.add(Dense(1, activation='linear'))
# 训练模型
model.compile(loss='mse', optimizer='adam')
model.fit(X, y, epochs=100, batch_size=10)
# 测试模型
new_data = np.array([[0.1, 18.0, 2.31, 0.0, 0.538, 6.575, 65.2, 4.0900, 1.0, 296.0, 15.3, 396.9, 4.98]])
new_data = scaler.transform(new_data)
prediction = model.predict(new_data)
print(prediction[0][0])
```
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