don't capture a string for each variable

src/compact.jl

@@ -96,8 +96,6 @@ macro compact(_exs...)
   kwexs = (kwexs1..., kwexs2...)
 
   # make strings
-  layer = "@compact"
-  setup = NamedTuple(map(ex -> Symbol(string(ex.args[1])) => string(ex.args[2]), kwexs))
   input =
       try
           fex_args = fex.args[1]
@@ -113,7 +111,7 @@ macro compact(_exs...)
   fex = supportself(fex, vars)
 
   # assemble
-  return esc(:($CompactLayer($fex, ($layer, $input, $block), $setup; $(kwexs...))))
+  return esc(:($CompactLayer($fex, ($input, $block); $(kwexs...))))
 end
 
 function supportself(fex::Expr, vars)
@@ -130,17 +128,18 @@ function supportself(fex::Expr, vars)
   end
 end
 
-struct CompactLayer{F,NT1<:NamedTuple,NT2<:NamedTuple}
+struct CompactLayer{F<:Function, NT<:NamedTuple}
   fun::F
-  strings::NTuple{3,String}
-  setup_strings::NT1
-  variables::NT2
+  strings::NTuple{2,String}
+  variables::NT
 end
-CompactLayer(f::Function, str::Tuple, setup_str::NamedTuple; kw...) = CompactLayer(f, str, setup_str, NamedTuple(kw))
-(m::CompactLayer)(x...) = m.fun(m.variables, x...)
-CompactLayer(args...) = error("CompactLayer is meant to be constructed by the macro")
+CompactLayer(f::Function, str::Tuple; kw...) = CompactLayer(f, str, NamedTuple(kw))
+CompactLayer(args...) = error("CompactLayer is meant to be constructed by the macro @compact")
+
 Flux.@functor CompactLayer
 
+(m::CompactLayer)(x...) = m.fun(m.variables, x...)
+
 Flux._show_children(m::CompactLayer) = m.variables
 
 function Base.show(io::IO, ::MIME"text/plain", m::CompactLayer)
@@ -154,16 +153,17 @@ function Base.show(io::IO, ::MIME"text/plain", m::CompactLayer)
 end
 
 function Flux._big_show(io::IO, obj::CompactLayer, indent::Int=0, name=nothing)
-  setup_strings = obj.setup_strings
-    layer, input, block = obj.strings
+    input, block = obj.strings
     pre, post = ("(", ")")
     println(io, " "^indent, "@compact", pre)
     for k in keys(obj.variables)
       v = obj.variables[k]
-      if Flux._show_leaflike(v)
+      if false # Flux._show_leaflike(v)
         # If the value is a leaf, just print verbatim what the user wrote:
-        str = String(k) * " = " * setup_strings[k]
+        # str = String(k) * " = " * summary(v)
+        str = String(k) * " isa " * string(typeof(v))
         _just_show_params(io, str, v, indent+2)
+        # Flux._layer_show(io::IO, str, indent+2, nothing)  # doesn't work
       else
         Flux._big_show(io, v, indent+2, String(k))
       end
@@ -188,6 +188,27 @@ function Flux._big_show(io::IO, obj::CompactLayer, indent::Int=0, name=nothing)
     end
 end
 
+# Temporarily fixing things via piracy, but would be an easy change in Flux
+using Flux: params, underscorise, _childarray_sum, _nan_show
+function Flux._layer_show(io::IO, layer::AbstractArray, indent::Int=0, name=nothing)
+  _str = isnothing(name) ? "" : "$name = "
+  # str = _str * sprint(show, layer, context=io)  # before
+  # str = _str * String(typeof(layer).name.name)  # print Array
+  str = _str * summary(layer)  # print size too, sometimes too long... trim it?
+  print(io, " "^indent, str, indent==0 ? "" : ",")
+  if !isempty(params(layer))
+    print(io, " "^max(2, (indent==0 ? 20 : 39) - indent - length(str)))
+    printstyled(io, "# ", underscorise(sum(length, params(layer); init=0)), " parameters"; 
+color=:light_black)
+    nonparam = _childarray_sum(length, layer) - sum(length, params(layer), init=0)
+    if nonparam > 0
+      printstyled(io, ", plus ", underscorise(nonparam), indent==0 ? " non-trainable" : ""; color=:light_black)
+    end
+    _nan_show(io, params(layer))
+  end
+  indent==0 || println(io)
+end
+
 # Modified from src/layers/show.jl
 function _just_show_params(io::IO, str::String, layer, indent::Int=0)
   print(io, " "^indent, str, indent==0 ? "" : ",")