From 7035565322373ef4a7721bd0f740324d020b8fe7 Mon Sep 17 00:00:00 2001
From: odow <o.dowson@gmail.com>
Date: Thu, 4 Jan 2024 13:12:02 +1300
Subject: [PATCH 1/3] Add AutomaticDifferentiationBackend

---
 docs/src/manual/models.md |  2 ++
 src/attributes.jl         | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/docs/src/manual/models.md b/docs/src/manual/models.md
index 7863b45ff8..d17e0f27f5 100644
--- a/docs/src/manual/models.md
+++ b/docs/src/manual/models.md
@@ -78,6 +78,7 @@ The following attributes are available:
  * [`ObjectiveFunction`](@ref)
  * [`ObjectiveFunctionType`](@ref)
  * [`ObjectiveSense`](@ref)
+
 ## AbstractOptimizer API
 
 The following attributes are available:
@@ -104,3 +105,4 @@ The following attributes are available:
  * [`TimeLimitSec`](@ref)
  * [`ObjectiveLimit`](@ref)
  * [`SolutionLimit`](@ref)
+ * [`AutomaticDifferentiationBackend`](@ref)
diff --git a/src/attributes.jl b/src/attributes.jl
index c30f67329b..c2ae466e07 100644
--- a/src/attributes.jl
+++ b/src/attributes.jl
@@ -2119,6 +2119,20 @@ struct ListOfSupportedNonlinearOperators <: AbstractOptimizerAttribute end
     OTHER_ERROR,
 )
 
+"""
+    AutomaticDifferentiationBackend() <: AbstractOptimizerAttribute
+
+An [`AbstractOptimizerAttribute`](@ref) for setting the automatic differentiation
+backend used by the solver.
+
+The value must be a subtype of [`Nonlinear.AbstractAutomaticDifferentiation`](@ref).
+"""
+struct AutomaticDifferentiationBackend <: AbstractOptimizerAttribute end
+
+function attribute_value_type(::AutomaticDifferentiationBackend)
+    return Nonlinear.AbstractAutomaticDifferentiation
+end
+
 """
     TerminationStatus()
 

From 67ceae882dff67b3ea3fb50cfdd6559e194938ce Mon Sep 17 00:00:00 2001
From: Oscar Dowson <odow@users.noreply.github.com>
Date: Thu, 4 Jan 2024 13:25:00 +1300
Subject: [PATCH 2/3] Update models.md

---
 docs/src/reference/models.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/src/reference/models.md b/docs/src/reference/models.md
index 253c1d6063..349130fbb2 100644
--- a/docs/src/reference/models.md
+++ b/docs/src/reference/models.md
@@ -86,6 +86,7 @@ NumberOfThreads
 RawSolver
 AbsoluteGapTolerance
 RelativeGapTolerance
+AutomaticDifferentiationBackend
 ```
 
 List of attributes useful for optimizers

From bc255c35b1d0e10ef02c8a86eda7ffdd17743483 Mon Sep 17 00:00:00 2001
From: odow <o.dowson@gmail.com>
Date: Thu, 4 Jan 2024 14:34:14 +1300
Subject: [PATCH 3/3] add test

---
 test/attributes.jl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/test/attributes.jl b/test/attributes.jl
index ba4af69682..929ad53a88 100644
--- a/test/attributes.jl
+++ b/test/attributes.jl
@@ -310,6 +310,12 @@ function test_scalar_nonlinear_function_set_objective()
     return
 end
 
+function test_attributes_AutomaticDifferentiationBackend()
+    @test MOI.attribute_value_type(MOI.AutomaticDifferentiationBackend()) ==
+          MOI.Nonlinear.AbstractAutomaticDifferentiation
+    return
+end
+
 function runtests()
     for name in names(@__MODULE__; all = true)
         if startswith("$name", "test_")