def _copy(data=None, out=None, name=None, **kwargs):
    """Returns a copy of the input.

    From:src/operator/tensor/elemwise_unary_op_basic.cc:246

    Parameters
    ----------
    data : NDArray
        The input array.

    out : NDArray, optional
        The output NDArray to hold the result.

    Returns
    -------
    out : NDArray or list of NDArrays
        The output of this function.
    """
    return 0,
