Update Day 1_Data_Preprocessing.md

最新版本train_test_split  在 sklearn.cross_validation
from sklearn.cross_validation import train_test_split

Code/Day 1_Data_Preprocessing.md

@@ -42,7 +42,8 @@ Y =  labelencoder_Y.fit_transform(Y)
 ```
 ## 第5步：拆分数据集为训练集合和测试集合
 ```python
-from sklearn.model_selection import train_test_split
+#from sklearn.model_selection import train_test_split
+from sklearn.cross_validation import train_test_split
 X_train, X_test, Y_train, Y_test = train_test_split( X , Y , test_size = 0.2, random_state = 0)
 ```
 ## 第6步：特征量化