text: from ..utils.importing import import_file
  
  
  class FeatureExtractor(object):
      def __init__(self, workflow_element_names=['feature_extractor']):
          self.element_names = workflow_element_names
  
      def train_submission(self, module_path, X_df, y_array, train_is=None):
          if train_is is None:
              train_is = slice(None, None, None)
          feature_extractor = import_file(module_path, self.element_names[0])
          fe = feature_extractor.FeatureExtractor()
          fe.fit(X_df.iloc[train_is], y_array[train_is])
          return fe
  
      def test_submission(self, trained_model, X_df):
          fe = trained_model
          X_test_array = fe.transform(X_df)
          return X_test_array
  