move input logic to flow

src/Flux.jl

@@ -2,8 +2,9 @@ module Flux
 
 using MacroTools, Lazy, DataFlow, Juno
 import DataFlow: graphm, syntax, prewalk!, postwalk!, prewalk, postwalk,
-  iscyclic, Constant, constant, isconstant, Group, group, value, inputs,
-  thread!, value, inputs, Split
+  iscyclic, Constant, constant, isconstant, Group, group, Split, splitnode,
+  detuple, value, inputs, thread!, value, inputs, Split, splitnode, inputnode,
+  spliceinputs, bumpinputs
 import Juno: Tree, Row
 
 # Zero Flux Given
@@ -12,7 +13,6 @@ include("model.jl")
 include("utils.jl")
 include("data.jl")
 
-include("compiler/graph.jl")
 include("compiler/diff.jl")
 include("compiler/code.jl")
 include("compiler/loops.jl")

src/compiler/graph.jl

@@ -1,45 +0,0 @@
-# TODO: most (all?) of this could be in DataFlow
-
-immutable ModelInput end
-
-splitnode(v, n) = vertex(Split(n), v)
-
-inputnode(n) = splitnode(constant(ModelInput()), n)
-
-isinput(v::IVertex) = isa(value(v), Split) && value(v[1]) == Constant(ModelInput())
-
-function bumpinputs(v::IVertex)
-  prewalk(v) do v
-    isinput(v) ?
-      inputnode(value(v).n + 1) :
-      v
-  end
-end
-
-function spliceinput(v::IVertex, input::IVertex)
-  postwalk(v) do v
-    value(v) == Constant(ModelInput()) ? input : v
-  end
-end
-
-spliceinputs(v::IVertex, inputs::Vertex...) =
-  spliceinput(v, vertex(Group(), inputs...))
-
-function ninputs(v::IVertex)
-  n = 0
-  prewalk(v) do v
-    isinput(v) && (n = max(n, value(v).n))
-    v
-  end
-  return n
-end
-
-function detuple(v::IVertex)
-  postwalk(v) do v
-    if isa(value(v), Split) && isa(value(v[1]), Group)
-      v[1][value(v).n]
-    else
-      v
-    end
-  end
-end