def METHOD_NAME(a):
    """Returns a copy of an array sorted along the first axis.
    Args:
        a (cupy.ndarray): Array to be sorted.
    Returns:
        cupy.ndarray: Array of the same type and shape as ``a``.
    .. note:
        ``cupy.msort(a)``, the CuPy counterpart of ``numpy.msort(a)``, is
        equivalent to ``cupy.sort(a, axis=0)``.
    .. seealso:: :func:`numpy.msort`
    """
    warnings.warn(
        'msort is deprecated, use cupy.sort(a, axis=0) instead',
        DeprecationWarning)
    return sort(a, axis=0)