Add ReverseDiff

Author: ChrisRackauckas

ext/ArrayInterfaceReverseDiffExt.jl

@@ -15,4 +15,8 @@ function ArrayInterface.aos_to_soa(x::AbstractArray{<:ReverseDiff.TrackedReal, N
     end
 end
 
+function ArrayInterface.restructure(x::Array, y::ReverseDiff.TrackedArray)
+    reshape(y, Base.size(x)...)
+end
+
 end # module

test/ad.jl

@@ -26,4 +26,13 @@ y = Tracker.TrackedReal.(rand(2,2))
 @test size(ArrayInterface.restructure(x, y)) == (4,)
 y = Tracker.TrackedArray(rand(2,2))
 @test ArrayInterface.restructure(x, y) isa Tracker.TrackedArray
-@test size(ArrayInterface.restructure(x, y)) == (4,)
+@test size(ArrayInterface.restructure(x, y)) == (4,)
+
+x = rand(4)
+y = ReverseDiff.track(rand(2,2))
+@test ArrayInterface.restructure(x, y) isa ReverseDiff.TrackedArray
+@test size(ArrayInterface.restructure(x, y)) == (4,)
+y = ReverseDiff.track.(rand(2,2))
+@test ArrayInterface.restructure(x, y) isa Array
+@test eltype(ArrayInterface.restructure(x, y)) <: ReverseDiff.TrackedReal
+@test size(ArrayInterface.restructure(x, y)) == (4,)