def METHOD_NAME(self, y: Tensor) -> Tensor:
    """
    Inverse transformation of `iResnet`
    Parameters
    ----------
    y
        input tensor
    Returns
    -------
    Tensor
        transformed tensor `\text{iResnet}^{-1}(y)`
    """
    if y is self._cached_y:
        return self._cached_x
    x = y + self._block(y)
    if self._use_caching:
        self._cached_x = x
        self._cached_y = y
    return x