fix

src/backend/mxnet/model.jl

@@ -88,7 +88,7 @@ end
 
 function mx.FeedForward(model::Flux.Model; input = :data, label = :softmax, context = mx.cpu())
   model = rewrite_softmax(model, label)
-  vars, stacks, node = tograph(model, mx.Variable(:input))
+  vars, stacks, node = tograph(model, mx.Variable(input))
   ff = mx.FeedForward(node, context = context)
   ff.arg_params = mxargs(vars)
   return ff

src/model.jl

@@ -92,7 +92,8 @@ end
 state(x) = x
 accumulate!(x, Δ) = x
 
-@forward Param.x Base.size
+Base.size(p::Param) = size(p.x)
+Base.size(p::Param, n) = size(p.x, n)
 
 function Base.show(io::IO, p::Param)
   print(io, "Param", size(p.x))