redundant

src/backend/mxnet/model.jl

@@ -10,8 +10,6 @@ end
 
 tond(xs::AArray) = copy!(mx.zeros(size(xs)), xs)
 
-fromnd(xs::mx.NDArray) = copy(xs)
-
 ndzero!(xs::mx.NDArray) = copy!(xs, mx.zeros(size(xs)))
 
 function mxargs(args)
@@ -50,13 +48,13 @@ end
 function (model::MXModel)(input)
   copy!(model.exec.arg_dict[:input], input)
   mx.forward(model.exec, is_train = true)
-  fromnd(model.exec.outputs[1])
+  copy(model.exec.outputs[1])
 end
 
 function Flux.back!(model::MXModel, Δ, x)
   ndzero!(model.grads[:input])
   mx.backward(model.exec, tond(Δ))
-  fromnd(model.grads[:input])
+  copy(model.grads[:input])
 end
 
 function Flux.update!(model::MXModel, η)