Class Sqrt

tensorflow/compiler/xla/python/bfloat16.cc:1124–1128

  bool operator()(bfloat16 a) { return std::signbit(static_cast<float>(a)); }
};
struct Sqrt {
  bfloat16 operator()(bfloat16 a) {
    return bfloat16(std::sqrt(static_cast<float>(a)));
  }
};
struct Square {
  bfloat16 operator()(bfloat16 a) {
    float f(a);