Update Day2_Simple_Linear_Regression.md
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# Simple Linear Regression
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# 简单线性回归模型
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<p align="center">
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<p align="center">
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X_train, X_test, Y_train, Y_test = train_test_split( X, Y, test_size = 1/4, random_state = 0)
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X_train, X_test, Y_train, Y_test = train_test_split( X, Y, test_size = 1/4, random_state = 0)
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```
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```
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# 第二步:训练集使用简单线性模型来训练
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# 第二步:训练集使用简单线性回归模型来训练
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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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