fixed np.ndarray type definition

cdplib/pipeline_selector/PipelineSelector.py

@@ -264,8 +264,8 @@ class PipelineSelector(ABC):
 
         else:
             try:
-                assert(isinstance(X_train, (pd.DataFrame, np.array)) and
-                       isinstance(y_train, (pd.Series, np.array,
+                assert(isinstance(X_train, (pd.DataFrame, np.ndarray)) and
+                       isinstance(y_train, (pd.Series, np.ndarray,
                                             pd.DataFrame, NoneType)) and
                        (X_val is None) and (y_val is None))
             except AssertionError: