import torch


def diff_dim0_replace_last_row(x: torch.Tensor):
    """
    Find the single row differences in x and then put the second to last row as the last row in
    the result

    Parameters
    ----------
    x : torch.Tensor

    Returns
    -------
    diff_0_last_row
        the single row differences with the second to last row and the last row
    """
    u0 = (-1.0 * x[0]).unsqueeze(0)
    u1 = (-1.0 * torch.diff(x, dim=0))[:-1]
    u2 = (x[-2]).unsqueeze(0)
    ret = torch.cat([u0, u1, u2], dim=0)
    return ret