update example

Author: kojix2

examples/classifier_comparison.rb

@@ -2,7 +2,7 @@
 include PyCall::Import
 
 pyimport 'numpy', as: :np
-pyfrom 'sklearn.cross_validation', import: :train_test_split
+pyfrom 'sklearn.model_selection', import: :train_test_split
 pyfrom 'sklearn.preprocessing', import: :StandardScaler
 pyfrom 'sklearn.datasets', import: %i(make_moons make_circles make_classification)
 pyfrom 'sklearn.neighbors', import: :KNeighborsClassifier

examples/notebooks/classifier_comparison.ipynb

@@ -38,7 +38,7 @@
     "include PyCall::Import\n",
     "\n",
     "pyimport 'numpy', as: :np\n",
-    "pyfrom 'sklearn.cross_validation', import: :train_test_split\n",
+    "pyfrom 'sklearn.model_selection', import: :train_test_split\n",
     "pyfrom 'sklearn.preprocessing', import: :StandardScaler\n",
     "pyfrom 'sklearn.datasets', import: %i(make_moons make_circles make_classification)\n",
     "pyfrom 'sklearn.neighbors', import: :KNeighborsClassifier\n",