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@ -39,7 +39,7 @@ X = X[: , 1:]
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from sklearn.cross_validation import train_test_split
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from sklearn.cross_validation import train_test_split
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X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size = 0.2, random_state = 0)
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X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size = 0.2, random_state = 0)
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```
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```
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## 第2步: 在训练集上训练使用多元线性回归模型
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## 第2步: 在训练集上训练多元线性回归模型
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```python
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```python
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from sklearn.linear_model import LinearRegression
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from sklearn.linear_model import LinearRegression
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regressor = LinearRegression()
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regressor = LinearRegression()
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