Struct BinaryBackwardArgs 

pub struct BinaryBackwardArgs<'a, T: Element, const N: usize> {
    pub dy: TensorRef<'a, T, N>,
    pub a: Option<TensorRef<'a, T, N>>,
    pub b: Option<TensorRef<'a, T, N>>,
    pub da: TensorMut<'a, T, N>,
    pub db: TensorMut<'a, T, N>,
}

Args bundle for a binary backward launch.

a and b are SAVED forward inputs — required by Mul, Div, Maximum, Minimum (gradient formula references them) but unused by Add / Sub. The dispatcher checks that ops needing saves have them supplied.

Fields

dy: TensorRef<'a, T, N>

Upstream gradient (input to backward).

a: Option<TensorRef<'a, T, N>>

Saved forward input a. Required by Mul / Div; ignored otherwise.

b: Option<TensorRef<'a, T, N>>

Saved forward input b. Required by Mul / Div; ignored otherwise.

da: TensorMut<'a, T, N>

Gradient w.r.t. a.

db: TensorMut<'a, T, N>

Gradient w.r.t. b.