[MRG] Randomized Search Example: Fix min_samples_split values for RandomizedSearchCV and GridSearchCV (scikit-learn#8847)

* Randomized Search Example: Fix min_samples_split values for RandomizedSearchCV and GridSearchCV

* Randomized Search Example: Change min_samples_split from 1.0 -> 2

Author: manrajgrover

examples/model_selection/randomized_search.py

@@ -54,7 +54,7 @@ def report(results, n_top=3):
 # specify parameters and distributions to sample from
 param_dist = {"max_depth": [3, None],
               "max_features": sp_randint(1, 11),
-              "min_samples_split": sp_randint(1, 11),
+              "min_samples_split": sp_randint(2, 11),
               "min_samples_leaf": sp_randint(1, 11),
               "bootstrap": [True, False],
               "criterion": ["gini", "entropy"]}
@@ -73,7 +73,7 @@ def report(results, n_top=3):
 # use a full grid over all parameters
 param_grid = {"max_depth": [3, None],
               "max_features": [1, 3, 10],
-              "min_samples_split": [1, 3, 10],
+              "min_samples_split": [2, 3, 10],
               "min_samples_leaf": [1, 3, 10],
               "bootstrap": [True, False],
               "criterion": ["gini", "entropy"]}