code: def _op_method(self, data, extra_factor=1.0):
          r
          return self.linear_op.adj_op(
              self.prox_op.op(self.linear_op.op(data), extra_factor=extra_factor)
          )
docs: r"""Operator method
  
          This method returns the scaled version of the proximity operator as
          given by Lemma 2.8 of [CW2005].
  
          Parameters
          ----------
          data : np.ndarray
              Input data array
          extra_factor : float
              Additional multiplication factor
  
          Returns
          -------
          np.ndarray result of the scaled proximity operator