take zero-arge closure

test/layers/basic.jl

@@ -37,21 +37,18 @@ using Test, Random
 
         @testset "Constructor" begin
             mo = MaxOut(() -> identity, 4)
-
             input = rand(40)
             @test mo(input) == input
         end
 
         @testset "simple alternatives" begin
             mo = MaxOut((x -> x, x -> 2x, x -> 0.5x))
-
             input = rand(40)
             @test mo(input) == 2*input
         end
 
         @testset "complex alternatives" begin
             mo = MaxOut((x -> [0.5; 0.1]*x, x -> [0.2; 0.7]*x))
-
             input = [3.0 2.0]
             target = [0.5, 0.7].*input
             @test mo(input) == target