feat: reactant support

Project.toml

@@ -1,7 +1,7 @@
 name = "ComponentArrays"
 uuid = "b0b7db55-cfe3-40fc-9ded-d10e2dbeff66"
 authors = ["Jonnie Diegelman <47193959+jonniedie@users.noreply.github.com>"]
-version = "0.15.20"
+version = "0.15.21"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
@@ -18,6 +18,7 @@ StaticArraysCore = "1e83bf80-4336-4d27-bf5d-d5a4f845583c"
 GPUArrays = "0c68f7d7-f131-5f86-a1c3-88cf8149b2d7"
 KernelAbstractions = "63c18a36-062a-441e-b654-da1e3ab1ce7c"
 Optimisers = "3bd65402-5787-11e9-1adc-39752487f4e2"
+Reactant = "3c362404-f566-11ee-1572-e11a4b42c853"
 RecursiveArrayTools = "731186ca-8d62-57ce-b412-fbd966d074cd"
 ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
 SciMLBase = "0bca4576-84f4-4d90-8ffe-ffa030f20462"
@@ -28,6 +29,7 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 ComponentArraysGPUArraysExt = "GPUArrays"
 ComponentArraysKernelAbstractionsExt = "KernelAbstractions"
 ComponentArraysOptimisersExt = "Optimisers"
+ComponentArraysReactantExt = "Reactant"
 ComponentArraysRecursiveArrayToolsExt = "RecursiveArrayTools"
 ComponentArraysReverseDiffExt = "ReverseDiff"
 ComponentArraysSciMLBaseExt = "SciMLBase"
@@ -45,6 +47,7 @@ GPUArrays = "10, 11"
 KernelAbstractions = "0.9.29"
 LinearAlgebra = "1.10"
 Optimisers = "0.3, 0.4"
+Reactant = "0.2.14"
 RecursiveArrayTools = "3.8"
 ReverseDiff = "1.15"
 SciMLBase = "2"

ext/ComponentArraysReactantExt.jl

@@ -0,0 +1,26 @@
+module ComponentArraysReactantExt
+
+using ArrayInterface: ArrayInterface
+using ComponentArrays, Reactant
+
+const TracedComponentVector{T} = ComponentVector{
+    Reactant.TracedRNumber{T},<:Reactant.TracedRArray{T}
+} where {T}
+
+# Reactant is good at memory management but not great at handling wrapped types. So we avoid
+# wrapping types into SubArrays and let Reactant optimize out intermediate allocations.
+
+@inline function Base.getproperty(x::TracedComponentVector{T}, s::Symbol) where {T}
+    return getproperty(x, Val(s))
+end
+
+@inline function Base.getproperty(x::TracedComponentVector{T}, v::Val) where {T}
+    return ComponentArrays._getindex(Base.getindex, x, v)
+end
+
+function ArrayInterface.restructure(x::ComponentVector, y::TracedComponentVector)
+    getaxes(x) == getaxes(y) || error("Axes must match")
+    return y
+end
+
+end

src/componentarray.jl

@@ -66,6 +66,8 @@ end
 Adapt.adapt_storage(::Type{ComponentArray{T,N,A,Ax}}, xs::AT) where {T,N,A,Ax,AT<:AbstractArray} =
     Adapt.adapt_storage(A, xs)
 
+Adapt.parent_type(::Type{ComponentArray{T,N,A,Ax}}) where {T,N,A,Ax} = A
+
 # Entry from NamedTuple, Dict, or kwargs
 ComponentArray{T}(nt::NamedTuple) where T = ComponentArray(make_carray_args(T, nt)...)
 ComponentArray{T}(::NamedTuple{(), Tuple{}}) where T = ComponentArray(T[], (FlatAxis(),))

test/Project.toml

@@ -11,6 +11,7 @@ LabelledArrays = "2ee39098-c373-598a-b85f-a56591580800"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 OffsetArrays = "6fe1bfb0-de20-5000-8ca7-80f57d26f881"
 Optimisers = "3bd65402-5787-11e9-1adc-39752487f4e2"
+Reactant = "3c362404-f566-11ee-1572-e11a4b42c853"
 ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

test/reactant_tests.jl

@@ -0,0 +1,8 @@
+using Reactant, ComponentArrays
+
+x = ComponentArray(; a = rand(4), b = rand(2))
+x_ra = Reactant.to_rarray(x)
+
+fn(x) = x.a .+ sum(abs2, x.b) .+ 1
+
+@test @jit(fn(x_ra)) ≈ fn(x)

test/runtests.jl

@@ -732,3 +732,7 @@ end
 @testset "GPU" begin
     include("gpu_tests.jl")
 end
+
+@testset "Reactant" begin
+    include("reactant_tests.jl")
+end