Fix demos

examples/regression_demo.py

@@ -2,7 +2,7 @@
 
 np.random.seed(1337)  # for reproducibility
 from sklearn.datasets import load_boston
-from sklearn.cross_validation import train_test_split
+from sklearn.model_selection import train_test_split
 from sklearn.metrics.regression import r2_score, mean_squared_error
 from sklearn.preprocessing import MinMaxScaler
 

examples/unsupervised_demo.py

@@ -25,7 +25,7 @@
 
 from scipy.ndimage import convolve
 from sklearn import linear_model, datasets, metrics
-from sklearn.cross_validation import train_test_split
+from sklearn.model_selection import train_test_split
 from sklearn.pipeline import Pipeline
 from dbn.models import UnsupervisedDBN # use "from dbn.tensorflow import SupervisedDBNClassification" for computations on TensorFlow