def seq_b2
import bendtorch@1.3.0.0/main.bend as Bendtorchimport Base
787def seq_b2(~P1: Type, ~X: Type, ~Y: Type, ~S1: Type, ~la: Layer<P1, X, Y, S1>, -P2: Type, p1: P1, s1: S1, g1: P1, r: Bwd<P2, Y>) -> Bwd<Two<P1, P2>, X>:
788 match r:
789 case Bwd{p2, dy, g2}:
790 seq_b3(P1, P2, X, p2, g2, Layer.bwd(P1, X, Y, S1, la, p1, s1, dy, g1))