test: workaround Enzyme warning

Author: avik-pal

lib/LuxLib/test/common_ops/activation_tests.jl

@@ -1,8 +1,17 @@
 @testitem "Activation Functions" tags=[:misc] setup=[SharedTestSetup] begin
+    using Enzyme
+
     rng = StableRNG(1234)
 
     apply_act(f::F, x) where {F} = sum(abs2, f.(x))
-    apply_act_fast(f::F, x) where {F} = sum(abs2, fast_activation!!(f, copy(x)))
+    function apply_act_fast(f::F, x) where {F}
+        if Enzyme.within_autodiff()
+            y = similar(x)
+            y .= x
+            return sum(abs2, fast_activation!!(f, y))
+        end
+        return sum(abs2, fast_activation!!(f, copy(x)))
+    end
     apply_act_fast2(f::F, x) where {F} = sum(abs2, fast_activation(f, x))
 
     @testset "$mode" for (mode, aType, ongpu, fp64) in MODES

test/layers/basic_tests.jl

@@ -242,6 +242,8 @@ end
 @testitem "Bilinear" setup=[SharedTestSetup] tags=[:core_layers] begin
     rng = StableRNG(12345)
 
+    skip_backends = VERSION < v"1.11-" ? [AutoEnzyme()] : []
+
     @testset "$mode" for (mode, aType, dev, ongpu) in MODES
         @testset "SkipConnection recombinator" begin
             d = Dense(2 => 2)
@@ -255,7 +257,8 @@ end
 
             @test size(layer(x, ps, st)[1]) == (3, 1)
             @jet layer(x, ps, st)
-            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3)
+            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3,
+                skip_backends)
 
             d = Dense(2 => 2)
             display(d)
@@ -268,7 +271,8 @@ end
 
             @test size(layer(x, ps, st)[1]) == (3, 1)
             @jet layer(x, ps, st)
-            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3)
+            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3,
+                skip_backends)
 
             d = Dense(2 => 3)
             display(d)
@@ -281,7 +285,8 @@ end
 
             @test size(layer(x, ps, st)[1]) == (5, 7, 11)
             @jet layer(x, ps, st)
-            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3)
+            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3,
+                skip_backends)
         end
 
         @testset "Two-streams zero sum" begin
@@ -296,7 +301,8 @@ end
 
             @test LuxCore.outputsize(layer, (x, y), rng) == (3,)
             @jet layer((x, y), ps, st)
-            @test_gradients(sumabs2first, layer, (x, y), ps, st; atol=1.0f-3, rtol=1.0f-3)
+            @test_gradients(sumabs2first, layer, (x, y), ps, st; atol=1.0f-3, rtol=1.0f-3,
+                skip_backends)
         end
 
         @testset "Inner interactions" begin
@@ -307,7 +313,8 @@ end
 
             @test size(layer(x, ps, st)[1]) == (3, 1)
             @jet layer(x, ps, st)
-            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3)
+            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3,
+                skip_backends)
 
             x = randn(Float32, 2, 1) |> aType
             layer = Bilinear(2 => 3)
@@ -316,7 +323,8 @@ end
 
             @test size(layer(x, ps, st)[1]) == (3, 1)
             @jet layer(x, ps, st)
-            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3)
+            @test_gradients(sumabs2first, layer, x, ps, st; atol=1.0f-3, rtol=1.0f-3,
+                skip_backends)
         end
     end
 end