def METHOD_NAME(self):
    tensorlib, _ = get_backend()
    self.a = tensorlib.astensor(self._a)
    self.b = tensorlib.astensor(self._b)
    self.b_plus_2a = tensorlib.astensor(self._b_plus_2a)
    self.b_minus_2a = tensorlib.astensor(self._b_minus_2a)
    # make up the masks correctly
    self.broadcast_helper = tensorlib.astensor(self._broadcast_helper)
    self.mask_on = tensorlib.ones(self.alphasets_shape)
    self.mask_off = tensorlib.zeros(self.alphasets_shape)