code: def ranked_attributes(self):
          
          matrix = javabridge.call(self.jobject, "rankedAttributes", "()[[D")
          if matrix is None:
              return None
          else:
              return typeconv.double_matrix_to_ndarray(matrix)
docs: Returns the matrix of ranked attributes from the last run.
  
          :return: the Numpy matrix
          :rtype: ndarray