Function imag_rrule 

pub fn imag_rrule<S: ComplexProjectionScalar>(cotangent: S::Real) -> S

Reverse rule for imag.

Examples

use chainrules::imag_rrule;
use num_complex::Complex64;

let grad: Complex64 = imag_rrule(2.0);
assert_eq!(grad, Complex64::new(0.0, 2.0));