def sigmoid(data=None, out=None, name=None, **kwargs):
    """Computes sigmoid of x element-wise.

    .. math::
       y = 1 / (1 + exp(-x))

    The storage type of ``sigmoid`` output is always dense



    Defined in src/operator/tensor/elemwise_unary_op_basic.cc:L119

    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,
