if a < 0 {
		return -a
	}
	return a
}

// ComplexAbs is a helper type that defines an Abs method for
// complex types.
type ComplexAbs[T Complex] T

func (a ComplexAbs[T]) Abs() ComplexAbs[T] {
	r := float64(real(a))
	i := float64(imag(a))
	d := math.Sqrt(r * r + i * i)
	return ComplexAbs[T](complex(d, 0))
}

func OrderedAbsDifference[T OrderedNumeric](a, b T) T {

	if a < 0 {
		return -a
	}
	return a
}

// ComplexAbs is a helper type that defines an Abs method for
// complex types.
type ComplexAbs[T Complex] T

func (a ComplexAbs[T]) Abs() ComplexAbs[T] {
	r := float64(real(a))
	i := float64(imag(a))
	d := math.Sqrt(r * r + i * i)
	return ComplexAbs[T](complex(d, 0))
}

func OrderedAbsDifference[T OrderedNumeric](a, b T) T {

// 	if a < 0 {
// 		return -a
// 	}
// 	return a
// }
//
// // complexAbs is a helper type that defines an Abs method for
// // complex types.
// type complexAbs[T Complex] T
//
// func (a complexAbs[T]) Abs() complexAbs[T] {
// 	r := float64(real(a))
// 	i := float64(imag(a))
// 	d := math.Sqrt(r*r + i*i)
// 	return complexAbs[T](complex(d, 0))
// }
//

// 	if a < 0 {
// 		return -a
// 	}
// 	return a
// }
//
// // complexAbs is a helper type that defines an Abs method for
// // complex types.
// type complexAbs[T Complex] T
//
// func (a complexAbs[T]) Abs() complexAbs[T] {
// 	r := float64(real(a))
// 	i := float64(imag(a))
// 	d := math.Sqrt(r*r + i*i)
// 	return complexAbs[T](complex(d, 0))
// }
//

// 	if a < 0 {
// 		return -a
// 	}
// 	return a
// }
// 
// // ComplexAbs is a helper type that defines an Abs method for
// // complex types.
// type ComplexAbs[T Complex] T
// 
// func (a ComplexAbs[T]) Abs() ComplexAbs[T] {
// 	r := float64(real(a))
// 	i := float64(imag(a))
// 	d := math.Sqrt(r * r + i * i)
// 	return ComplexAbs[T](complex(d, 0))
// }
// 
// func OrderedAbsDifference[T OrderedNumeric](a, b T) T {

// implications on the spec. See issue #51576.
// Use accessor method instead.

func (a orderedAbs[T]) Value() T {
	return a.Value_
}

// complexAbs is a helper type that defines an Abs method for
// a struct containing a complex type.
type complexAbs[T Complex] struct {
	Value_ T
}

func realimag(x any) (re, im float64) {
	switch z := x.(type) {
	case complex64:
		re = float64(real(z))

// implications on the spec. See issue #51576.
// Use accessor method instead.

func (a orderedAbs[T]) Value() T {
	return a.Value_
}

// complexAbs is a helper type that defines an Abs method for
// a struct containing a complex type.
type complexAbs[T Complex] struct {
	Value_ T
}

func realimag(x any) (re, im float64) {
	switch z := x.(type) {
	case complex64:
		re = float64(real(z))

	case complex64:
		re = float64(real(z))
		im = float64(imag(z))
	case complex128:
		re = real(z)
		im = imag(z)
	default:
		panic("unknown complex type")
	}
	return
}

func ComplexAbs[T Complex](a T) T {
	// TODO use direct conversion instead of realimag once #50937 is fixed
	r, i := realimag(a)
	// r := float64(real(a))
	// i := float64(imag(a))
	d := math.Sqrt(r*r + i*i)
	return T(complex(d, 0))

/// <X_T, Y_T, JAC_T> should be <complex64, complex64, float>
/// Note that JAC_T is always real-valued, and should be an appropriate
/// precision to host the partial derivatives for dy/dx
///
/// if y = ComplexAbs(x) where x is DT_COMPLEX64 (so y is DT_FLOAT)
/// <X_T, Y_T, JAC_T> should be <complex64, float, float>
///
/// if y = Complex(x, x) where x is DT_FLOAT (so y is DT_COMPLEX64)

  static absl::flat_hash_map<string, std::vector<string>>* result =
      new absl::flat_hash_map<string, std::vector<string>>{
          // Unary
          {"PW",
           {"ComplexAbs", "Angle", "Conj", "Abs", "Acos", "Acosh", "Asin",
            "Atan", "Atanh", "Ceil", "Cos", "Cosh", "Sin", "Exp", "Expm1",
            "Floor", "IsFinite", "IsInf", "IsNan", "Inv", "Reciprocal", "Log",