def METHOD_NAME(e, out):
    """Builtin message function that computes message using edge feature.
    Parameters
    ----------
    e : str
        The edge feature field.
    out : str
        The output message field.
    Examples
    --------
    >>> import dgl
    >>> message_func = dgl.function.copy_e('h', 'm')
    The above example is equivalent to the following user defined function:
    >>> def message_func(edges):
    >>>     return {'m': edges.data['h']}
    """
    return CopyMessageFunction(TargetCode.EDGE, e, out)