Some small printing upgrades (#2344)

* some printing upgrades

* print eltype too

* move one line to solve order-of-loading issue

* better fix

* tests, and Fix1

Project.toml

@@ -1,6 +1,6 @@
 name = "Flux"
 uuid = "587475ba-b771-5e3f-ad9e-33799f191a9c"
-version = "0.14.22"
+version = "0.14.23"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"

src/layers/show.jl

@@ -20,16 +20,16 @@ function _macro_big_show(ex)
 end
 
 function _big_show(io::IO, obj, indent::Int=0, name=nothing)
-  pre, post = obj isa Chain{<:AbstractVector} ? ("([", "])") : ("(", ")")
+  pre, post = _show_pre_post(obj)
   children = _show_children(obj)
   if all(_show_leaflike, children)
     # This check may not be useful anymore: it tries to infer when to stop the recursion by looking for grandkids,
     # but once all layers use @layer, they stop the recursion by defining a method for _big_show.
     _layer_show(io, obj, indent, name)
   else
-    println(io, " "^indent, isnothing(name) ? "" : "$name = ", nameof(typeof(obj)), pre)
-    if obj isa Chain{<:NamedTuple} && children == getfield(obj, :layers)
-      # then we insert names -- can this be done more generically? 
+    println(io, " "^indent, isnothing(name) ? "" : "$name = ", pre)
+    if obj isa Chain{<:NamedTuple} || obj isa NamedTuple
+      # then we insert names -- can this be done more generically?
       for k in Base.keys(obj)
         _big_show(io, obj[k], indent+2, k)
       end
@@ -52,6 +52,20 @@ function _big_show(io::IO, obj, indent::Int=0, name=nothing)
   end
 end
 
+for Fix in (:Fix1, :Fix2)
+  pre = string(Fix, "(")
+  @eval function _big_show(io::IO, obj::Base.$Fix, indent::Int=0, name=nothing)
+    println(io, " "^indent, isnothing(name) ? "" : "$name = ", $pre)
+    _big_show(io, obj.f, indent+2)
+    _big_show(io, obj.x, indent+2)
+    println(io, " "^indent, ")", ",")
+  end
+end
+
+_show_pre_post(obj) = string(nameof(typeof(obj)), "("), ")"
+_show_pre_post(::AbstractVector) = "[", "]"
+_show_pre_post(::NamedTuple) = "(;", ")"
+
 _show_leaflike(x) = isleaf(x)  # mostly follow Functors, except for:
 
 # note the covariance of tuple, using <:T causes warning or error
@@ -88,7 +102,7 @@ end
 
 function _layer_show(io::IO, layer, indent::Int=0, name=nothing)
   _str = isnothing(name) ? "" : "$name = "
-  str = _str * sprint(show, layer, context=io)
+  str = _str * _layer_string(io, layer)
   print(io, " "^indent, str, indent==0 ? "" : ",")
   if !isempty(params(layer))
     print(io, " "^max(2, (indent==0 ? 20 : 39) - indent - length(str)))
@@ -103,6 +117,15 @@ color=:light_black)
   indent==0 || println(io)
 end
 
+_layer_string(io::IO, layer) = sprint(show, layer, context=io)
+# _layer_string(::IO, a::AbstractArray) = summary(layer)  # sometimes too long e.g. CuArray
+function _layer_string(::IO, a::AbstractArray)
+  full = string(typeof(a))
+  comma = findfirst(',', full)
+  short = isnothing(comma) ? full : full[1:comma] * "...}"
+  Base.dims2string(size(a)) * " " * short
+end
+
 function _big_finale(io::IO, m)
   ps = params(m)
   if length(ps) > 2
@@ -150,3 +173,43 @@ _any(f, x::Number) = f(x)
 # _any(f, x) = false
 
 _all(f, xs) = !_any(!f, xs)
+
+#=
+
+julia> struct Tmp2; x; y; end; Flux.@functor Tmp2
+
+# Before, notice Array(), NamedTuple(), and values
+
+julia> Chain(Tmp2([Dense(2,3), randn(3,4)'], (x=1:3, y=Dense(3,4), z=rand(3))))
+Chain(
+  Tmp2(
+    Array(
+      Dense(2 => 3),                    # 9 parameters
+      [0.351978391016603 0.6408681372462821 -1.326533184688648; 0.09481930831795712 1.430103476272605 0.7250467613675332; 2.03372151428719 -0.015879812799495713 1.9499692162118236; -1.6346846180722918 -0.8364610153059454 -1.2907265737483433],  # 12 parameters
+    ),
+    NamedTuple(
+      1:3,                              # 3 parameters
+      Dense(3 => 4),                    # 16 parameters
+      [0.9666158193429335, 0.01613900990539574, 0.0205920186127464],  # 3 parameters
+    ),
+  ),
+)                   # Total: 7 arrays, 43 parameters, 644 bytes.
+
+# After, (; x=, y=, z=) and "3-element Array"
+
+julia> Chain(Tmp2([Dense(2,3), randn(3,4)'], (x=1:3, y=Dense(3,4), z=rand(3))))
+Chain(
+  Tmp2(
+    [
+      Dense(2 => 3),                    # 9 parameters
+      4×3 Adjoint,                      # 12 parameters
+    ],
+    (;
+      x = 3-element UnitRange,          # 3 parameters
+      y = Dense(3 => 4),                # 16 parameters
+      z = 3-element Array,              # 3 parameters
+    ),
+  ),
+)                   # Total: 7 arrays, 43 parameters, 644 bytes.
+
+=#

test/layers/show.jl

@@ -71,7 +71,13 @@ end
   # Functors@0.3 marks transposed matrices non-leaf, shouldn't affect printing:
   adjoint_chain = repr("text/plain", Chain([Dense([1 2; 3 4]')]))
   @test occursin("Dense(2 => 2)", adjoint_chain)
-  @test occursin("Chain([", adjoint_chain)
+  @test occursin("Chain(", adjoint_chain)
+  @test occursin("[", adjoint_chain)
+
+  # New printing of arrays, and Fix1
+  fix_chain = repr("text/plain", Chain(Base.Fix1(*, rand32(22,33)), softmax))
+  @test occursin("Fix1(", fix_chain)
+  @test occursin("22×33 Matrix{Float32}", fix_chain)
 end
 
 # Bug when no children, https://github.com/FluxML/Flux.jl/issues/2208