remove anon model compilation

src/compiler/code.jl

@@ -81,16 +81,8 @@ end
 
 function process_anon(ex)
   args, body = process_func(ex)
-  layers = Set{Symbol}()
-  Flow.prefor(body) do v
-    isexpr(value(v), Symbol) && push!(layers, value(v))
-  end
   @assert length(args) == 1
-  :(Flux.Capacitor(
-      ($(args...)) -> $(build_forward(body, args)),
-      (Δ, $(args...)) -> $(build_backward(body, args[1])),
-      η -> $(map(p -> :(update!($p, η)), layers)...),
-      $(Flow.constructor(makegraph(body, args))))) |> esc
+  :(Flux.Capacitor($(Flow.constructor(makegraph(body, args))))) |> esc
 end
 
 macro model(ex)

src/model.jl

@@ -39,17 +39,10 @@ accumulate!(x, Δ) = x
 export Capacitor
 
 type Capacitor <: Model
-  forward::Function
-  backward::Function
-  update::Function
   graph::IVertex{Any}
 end
 
-(cap::Capacitor)(args...) = cap.forward(args...)
-
-back!(cap::Capacitor, args...) = cap.backward(args...)
-
-update!(cap::Capacitor, η) = cap.update(η)
+# TODO: Julia implementation that interprets the graph
 
 graph(cap::Capacitor) = cap.graph