Method operator<

numpy/core/src/common/half.hpp:144–147

        return !(IsNaN() || r.IsNaN()) && Equal(r);
    }
    constexpr bool operator<(Half r) const
    {
        return !(IsNaN() || r.IsNaN()) && Less(r);
    }
    constexpr bool operator<=(Half r) const
    {
        return !(IsNaN() || r.IsNaN()) && LessEqual(r);