move the logger at init and use a copy of the dictionary

Author: Guillaume Lemaitre

imblearn/base.py

@@ -54,6 +54,7 @@ def __init__(self, ratio='auto', verbose=True):
 
         self.ratio = ratio
         self.verbose = verbose
+        self.logger = logging.getLogger(__name__)
 
     def fit(self, X, y):
         """Find the classes statistics before to perform sampling.
@@ -73,9 +74,6 @@ def fit(self, X, y):
 
         """
 
-        # Create logger
-        self.logger = logging.getLogger(__name__)
-
         # Check the consistency of X and y
         X, y = check_X_y(X, y)
 
@@ -228,6 +226,6 @@ def _sample(self, X, y):
 
     def __getstate__(self):
         """Prevent logger from being pickled"""
-        object_dictionary = dict(self.__dict__)
+        object_dictionary = self.__dict__.copy()
         del object_dictionary['logger']
         return object_dictionary