Update easy_ensemble_generalization.py

Author: chkoar

imblearn/ensemble/easy_ensemble_generalization.py

@@ -13,6 +13,7 @@
 from sklearn.externals import six
 from sklearn.tree import DecisionTreeClassifier
 from sklearn.utils import check_random_state
+from sklearn.utils.multiclass import check_classification_targets
 from sklearn.utils.validation import check_is_fitted
 
 
@@ -132,11 +133,10 @@ def fit(self, X, y, sample_weight=None):
             Returns self.
         """
 
-        random_state = check_random_state(self.random_state)
-
+        check_classification_targets(y)
         self._validate_estimator()
         self._validate_sampler()
-
+        
         random_state = check_random_state(self.random_state)
 
         if not hasattr(self.base_sampler, 'random_state'):