update sklearn code

Author: MorvanZhou

sklearnTUT/sk4_learning_pattern.py

@@ -8,7 +8,7 @@
 """
 from __future__ import print_function
 from sklearn import datasets
-from sklearn.cross_validation import train_test_split
+from sklearn.model_selection import train_test_split
 from sklearn.neighbors import KNeighborsClassifier
 
 iris = datasets.load_iris()

sklearnTUT/sk7_normalization.py

@@ -9,7 +9,7 @@
 from __future__ import print_function
 from sklearn import preprocessing
 import numpy as np
-from sklearn.cross_validation import train_test_split
+from sklearn.model_selection import train_test_split
 from sklearn.datasets.samples_generator import make_classification
 from sklearn.svm import SVC
 import matplotlib.pyplot as plt