Add Adapter to train_test_split

conML/ports/train_test_split_adapter.py

+#  C O N S T R U C T I V I S T__ __
+#   _____ ____   ____   /  |/  // /
+#  / ___// __ \ / __ \ / /|_/ // /
+# / /__ / /_/ // / / // /  / // /___
+# \___/ \____//_/ /_//_/  /_//_____/
+#  M A C H I N E   L E A R N I N G
+#
+#
+# A Project by
+# Thomas Schmid | UNIVERSITÄT LEIPZIG
+# www.constructivist.ml
+#
+# Code Author: Dmitrij Denisenko
+# Licence: MIT
+
+
+"""Adapter to a train_test_split method
+
+"""
+
+
+from sklearn.model_selection import train_test_split
+
+
+def split(learnblock, test_size):
+    train, test = train_test_split(learnblock.indices(), stratify=learnblock.get_column('Z'), test_size=test_size)
+    return (
+        learnblock.new_block_from(train, index=True),
+        learnblock.new_block_from(test, index=True)
+    )
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