type CatG
import bendtorch@1.3.0.0/tensor.bend as Tensorimport Base
606# the gradients of cat: dz's window of a, and dz's window of b (dz comes back); returned as TP<a, b> after dz
607type CatG<-a: List<&2, Nat>, -b: List<&2, Nat>, -o: List<&2, Nat>> is Type:
608 CatG{dz: Tensor<o>, ga: Tensor<a>, gb: Tensor<b>}