def act_b2
import bendtorch@1.3.0.0/main.bend as Bendtorchimport Base
import bend-ml-tensor-array@0.1.18.0/main.bend as TA
744def act_b2(-n: Nat, -c: Nat, r: TA.MPair<n, c>) -> Bwd<Unit, TA.Mat<n, c>>:
745 match r:
746 case TA.MPair{dx, y}:
747 Bwd{Unit{}, dx, Unit{}}