def _get_V_t(param, savefield, subsampling=None):
    """Fetch the GGN(MC) matrix square root ``Vᵀ`` with active samples.

    Args:
        param (torch.nn.Parameter): Parameter defining ``Vᵀ``.
        savefield (str): Attribute under which ``Vᵀ`` is stored in a parameter.
        subsampling ([int]): Sample indices to be used of ``Vᵀ``. ``None`` uses all
            available samples.

    Returns:
        torch.Tensor: Sub-sampled ``Vᵀ`` tensor.
    """
    V_t = getattr(param, savefield)

    if subsampling is not None:
        V_t = V_t[:, subsampling]

    return V_t