test: add runtime activity to enzyme (#159)

* test: add runtime activity to enzyme

* Runtime activity in recommended backend

Author: gdalle

ext/ImplicitDifferentiationEnzymeExt.jl

@@ -5,7 +5,9 @@ using Enzyme
 using Enzyme.EnzymeRules
 using ImplicitDifferentiation: ImplicitFunction, build_A, build_B, byproduct, output
 
-const FORWARD_BACKEND = AutoEnzyme(; mode=Enzyme.Forward, function_annotation=Enzyme.Const)
+const FORWARD_BACKEND = AutoEnzyme(;
+    mode=Enzyme.set_runtime_activity(Enzyme.Forward), function_annotation=Enzyme.Const
+)
 
 function EnzymeRules.forward(
     config::EnzymeRules.FwdConfig,

test/systematic.jl

@@ -12,7 +12,9 @@ include("utils.jl")
 
 backends = [
     AutoForwardDiff(; chunksize=1), #
-    AutoEnzyme(; mode=Enzyme.Forward, function_annotation=Enzyme.Const),
+    AutoEnzyme(;
+        mode=Enzyme.set_runtime_activity(Enzyme.Forward), function_annotation=Enzyme.Const
+    ),
     AutoZygote(),
 ]
 
@@ -24,7 +26,9 @@ linear_solver_candidates = (
 conditions_backend_candidates = (
     nothing, #
     AutoForwardDiff(; chunksize=1),
-    AutoEnzyme(; mode=Enzyme.Forward, function_annotation=Enzyme.Const),
+    AutoEnzyme(;
+        mode=Enzyme.set_runtime_activity(Enzyme.Forward), function_annotation=Enzyme.Const
+    ),
 );
 
 x_candidates = (