Merge pull request #4 from alejandroaldas/ifws3f-codex/fix-mean_squared_error-argument-order

Fix parameter order in decision tree mse

Author: alejandroaldas

machine_learning/decision_tree.py

@@ -96,7 +96,7 @@ def train(self, x, y):
             return
 
         best_split = 0
-        min_error = self.mean_squared_error(x, np.mean(y)) * 2
+        min_error = self.mean_squared_error(y, np.mean(y)) * 2
 
         """
         loop over all possible splits for the decision tree. find the best split.