Fix linting

Signed-off-by: Gaurav Gupta <gaugup@microsoft.com>

Author: gaugup

dice_ml/explainer_interfaces/dice_genetic.py

@@ -560,7 +560,7 @@ def label_decode_cfs(self, cfs_arr):
             if ret_df is None:
                 ret_df = df
             else:
-                ret_df = pd.concat([ret_df,df])
+                ret_df = pd.concat([ret_df, df])
         return ret_df
 
     def get_valid_feature_range(self, normalized=False):

dice_ml/explainer_interfaces/dice_random.py

@@ -122,7 +122,7 @@ class of query_instance for binary classification.
                 if cfs_df is None:
                     cfs_df = rows_to_add.copy()
                 else:
-                    cfs_df = pd.concat([cfs_df,rows_to_add])
+                    cfs_df = pd.concat([cfs_df, rows_to_add])
                 cfs_df.drop_duplicates(inplace=True)
                 # Always change at least 2 features before stopping
                 if num_features_to_vary >= 2 and len(cfs_df) >= total_CFs: