Make get_differential_vars type stable

docs/src/massmatrixdae/BDF.md

@@ -7,6 +7,7 @@ CollapsedDocStrings = true
 Multistep BDF methods, good for large stiff systems.
 
 ```julia
+using LinearAlgebra: Diagonal
 function rober(du, u, p, t)
     y₁, y₂, y₃ = u
     k₁, k₂, k₃ = p
@@ -15,9 +16,7 @@ function rober(du, u, p, t)
     du[3] = y₁ + y₂ + y₃ - 1
     nothing
 end
-M = [1.0 0 0
-     0 1.0 0
-     0 0 0]
+M = Diagonal([1.0, 1.0, 0])
 f = ODEFunction(rober, mass_matrix = M)
 prob_mm = ODEProblem(f, [1.0, 0.0, 0.0], (0.0, 1e5), (0.04, 3e7, 1e4))
 sol = solve(prob_mm, FBDF(), reltol = 1e-8, abstol = 1e-8)

docs/src/massmatrixdae/Rosenbrock.md

@@ -20,6 +20,7 @@ For larger systems look at multistep methods.
 ## Example usage
 
 ```julia
+using LinearAlgebra: Diagonal
 function rober(du, u, p, t)
     y₁, y₂, y₃ = u
     k₁, k₂, k₃ = p
@@ -28,9 +29,7 @@ function rober(du, u, p, t)
     du[3] = y₁ + y₂ + y₃ - 1
     nothing
 end
-M = [1.0 0 0
-     0 1.0 0
-     0 0 0]
+M = Diagonal([1.0, 1.0, 0])
 f = ODEFunction(rober, mass_matrix = M)
 prob_mm = ODEProblem(f, [1.0, 0.0, 0.0], (0.0, 1e5), (0.04, 3e7, 1e4))
 sol = solve(prob_mm, Rodas5(), reltol = 1e-8, abstol = 1e-8)

lib/OrdinaryDiffEqBDF/test/dae_ad_tests.jl

@@ -1,5 +1,8 @@
 using OrdinaryDiffEqBDF, LinearAlgebra, ForwardDiff, Test
 using OrdinaryDiffEqNonlinearSolve: BrownFullBasicInit, ShampineCollocationInit
+using ADTypes: AutoForwardDiff, AutoFiniteDiff
+
+afd_cs3 = AutoForwardDiff(chunksize=3)
 
 function f(out, du, u, p, t)
     out[1] = -p[1] * u[1] + p[3] * u[2] * u[3] - du[1]
@@ -16,22 +19,30 @@ u₀ = [1.0, 0, 0]
 du₀ = [-0.04, 0.04, 0.0]
 tspan = (0.0, 100000.0)
 differential_vars = [true, true, false]
+M = Diagonal([1.0, 1.0, 0.0])
 prob = DAEProblem(f, du₀, u₀, tspan, p, differential_vars = differential_vars)
 prob_oop = DAEProblem{false}(f, du₀, u₀, tspan, p, differential_vars = differential_vars)
-sol1 = solve(prob, DFBDF(), dt = 1e-5, abstol = 1e-8, reltol = 1e-8)
-sol2 = solve(prob_oop, DFBDF(), dt = 1e-5, abstol = 1e-8, reltol = 1e-8)
+f_mm = ODEFunction{true, SciMLBase.AutoSpecialize}(f, mass_matrix = M)
+prob_mm = ODEProblem(f_mm, u₀, tspan, p)
+@test_broken sol1 = @inferred solve(prob, DFBDF(autodiff=afd_cs3), dt = 1e-5, abstol = 1e-8, reltol = 1e-8)
+@test_broken sol2 = @inferred solve(prob_oop, DFBDF(autodiff=afd_cs3), dt = 1e-5, abstol = 1e-8, reltol = 1e-8)
+@test_broken sol3 = @inferred solve(prob_mm, FBDF(autodiff=afd_cs3), dt = 1e-5, abstol = 1e-8, reltol = 1e-8)
 
 # These tests flex differentiation of the solver and through the initialization
 # To only test the solver part and isolate potential issues, set the initialization to consistent
- @testset "Inplace: $(isinplace(_prob)), DAEProblem: $(_prob isa DAEProblem), BrownBasic: $(initalg isa BrownFullBasicInit), Autodiff: $autodiff" for _prob in [
-        prob, prob_oop],
-    initalg in [BrownFullBasicInit(), ShampineCollocationInit()], autodiff in [true, false]
+@testset "Inplace: $(isinplace(_prob)), DAEProblem: $(_prob isa DAEProblem), BrownBasic: $(initalg isa BrownFullBasicInit), Autodiff: $autodiff" for _prob in [
+        prob, prob_oop, prob_mm],
+    initalg in [BrownFullBasicInit(), ShampineCollocationInit()], autodiff in [afd_cs3, AutoFiniteDiff()]
 
-    alg = DFBDF(; autodiff)
+    alg = (_prob isa DAEProblem) ? DFBDF(; autodiff) : FBDF(; autodiff)
     function f(p)
         sol = solve(remake(_prob, p = p), alg, abstol = 1e-14,
             reltol = 1e-14, initializealg = initalg)
         sum(sol)
     end
-    @test ForwardDiff.gradient(f, [0.04, 3e7, 1e4])≈[0, 0, 0] atol=1e-8
+    if _prob isa DAEProblem
+        @test ForwardDiff.gradient(f, [0.04, 3e7, 1e4])≈[0, 0, 0] atol=1e-8
+    else
+        @test_broken ForwardDiff.gradient(f, [0.04, 3e7, 1e4])≈[0, 0, 0] atol=1e-8
+    end
 end

lib/OrdinaryDiffEqCore/src/misc_utils.jl

@@ -114,18 +114,21 @@ are differential variables. Returns `DifferentialVarsUndefined` if it cannot
 be determined (i.e. the mass matrix is not diagonal).
 """
 function get_differential_vars(f, u)
-    differential_vars = nothing
     if hasproperty(f, :mass_matrix)
         mm = f.mass_matrix
         mm = mm isa MatrixOperator ? mm.A : mm
 
-        if mm isa UniformScaling || all(!iszero, mm)
+        if mm isa UniformScaling 
             return nothing
+        elseif all(!iszero, mm)
+            return trues(size(mm, 1))
         elseif !(mm isa SciMLOperators.AbstractSciMLOperator) && isdiag(mm)
-            differential_vars = reshape(diag(mm) .!= 0, size(u))
+            return reshape(diag(mm) .!= 0, size(u))
         else
             return DifferentialVarsUndefined()
         end
+    else
+        return nothing
     end
 end
 

lib/OrdinaryDiffEqRosenbrock/test/dae_rosenbrock_ad_tests.jl

@@ -1,6 +1,8 @@
 using OrdinaryDiffEqRosenbrock, LinearAlgebra, ForwardDiff, Test
 using OrdinaryDiffEqNonlinearSolve: BrownFullBasicInit, ShampineCollocationInit
+using ADTypes: AutoForwardDiff, AutoFiniteDiff
 
+afd_cs3 = AutoForwardDiff(chunksize=3)
 function rober(du, u, p, t)
     y₁, y₂, y₃ = u
     k₁, k₂, k₃ = p
@@ -16,25 +18,24 @@ function rober(u, p, t)
         k₁ * y₁ - k₃ * y₂ * y₃ - k₂ * y₂^2,
         y₁ + y₂ + y₃ - 1]
 end
-M = [1.0 0 0
-     0 1.0 0
-     0 0 0]
-roberf = ODEFunction(rober, mass_matrix = M)
-roberf_oop = ODEFunction{false}(rober, mass_matrix = M)
+M = Diagonal([1.0, 1.0, 0.0])
+roberf = ODEFunction{true, SciMLBase.AutoSpecialize}(rober, mass_matrix = M)
+roberf_oop = ODEFunction{false, SciMLBase.AutoSpecialize}(rober, mass_matrix = M)
 prob_mm = ODEProblem(roberf, [1.0, 0.0, 0.2], (0.0, 1e5), (0.04, 3e7, 1e4))
 prob_mm_oop = ODEProblem(roberf_oop, [1.0, 0.0, 0.2], (0.0, 1e5), (0.04, 3e7, 1e4))
-sol = solve(prob_mm, Rodas5P(), reltol = 1e-8, abstol = 1e-8)
-sol = solve(prob_mm_oop, Rodas5P(), reltol = 1e-8, abstol = 1e-8)
+# Both should be inferrable so long as AutoSpecialize is used...
+@test_broken sol = @inferred solve(prob_mm, Rodas5P(), reltol = 1e-8, abstol = 1e-8) 
+sol = @inferred solve(prob_mm_oop, Rodas5P(), reltol = 1e-8, abstol = 1e-8)
 
 # These tests flex differentiation of the solver and through the initialization
 # To only test the solver part and isolate potential issues, set the initialization to consistent
 @testset "Inplace: $(isinplace(_prob)), DAEProblem: $(_prob isa DAEProblem), BrownBasic: $(initalg isa BrownFullBasicInit), Autodiff: $autodiff" for _prob in [
         prob_mm, prob_mm_oop],
-    initalg in [BrownFullBasicInit(), ShampineCollocationInit()], autodiff in [true, false]
+    initalg in [BrownFullBasicInit(), ShampineCollocationInit()], autodiff in [AutoForwardDiff(chunksize=3), AutoFiniteDiff()]
 
     alg = Rodas5P(; autodiff)
     function f(p)
-        sol = solve(remake(_prob, p = p), alg, abstol = 1e-14,
+        sol = @inferred solve(remake(_prob, p = p), alg, abstol = 1e-14,
             reltol = 1e-14, initializealg = initalg)
         sum(sol)
     end

test/interface/mass_matrix_tests.jl

@@ -1,6 +1,8 @@
 using OrdinaryDiffEq, Test, LinearAlgebra, Statistics
 using OrdinaryDiffEqCore
 using OrdinaryDiffEqNonlinearSolve: NLFunctional, NLAnderson, NLNewton
+using LinearAlgebra: Diagonal
+using ADTypes: AutoForwardDiff
 
 # create mass matrix problems
 function make_mm_probs(mm_A, ::Val{iip}) where {iip}
@@ -194,11 +196,10 @@ end
     u0 = [0.0, 1.0]
     tspan = (0.0, 1.0)
 
-    M = fill(0.0, 2, 2)
-    M[1, 1] = 1.0
+    M = Diagonal([1.0, 0.0])
 
     m_ode_prob = ODEProblem(ODEFunction(f!; mass_matrix = M), u0, tspan)
-    @test_nowarn sol = solve(m_ode_prob, Rosenbrock23())
+    @test_nowarn sol = @inferred solve(m_ode_prob, Rosenbrock23(autodiff=AutoForwardDiff(chunksize=2)))
 
     M = [0.637947 0.637947
          0.637947 0.637947]
@@ -323,14 +324,15 @@ function dynamics(u, p, t)
 end
 
 x0 = zeros(n, n)
-M = zeros(n * n) |> Diagonal |> Matrix
+M = zeros(n * n) |> Diagonal
 M[1, 1] = true # zero mass matrix breaks rosenbrock
-f = ODEFunction(dynamics!, mass_matrix = M)
+f = ODEFunction{true, SciMLBase.AutoSpecialize}(dynamics!, mass_matrix = M)
 tspan = (0, 10.0)
+adalg = AutoForwardDiff(chunksize=n)
 prob = ODEProblem(f, x0, tspan)
-foop = ODEFunction(dynamics, mass_matrix = M)
+foop = ODEFunction{false, SciMLBase.AutoSpecialize}(dynamics, mass_matrix = M)
 proboop = ODEProblem(f, x0, tspan)
-sol = solve(prob, Rosenbrock23())
-sol = solve(prob, Rodas4(), initializealg = ShampineCollocationInit())
-sol = solve(proboop, Rodas5())
-sol = solve(proboop, Rodas4(), initializealg = ShampineCollocationInit())
+@test_broken sol = @inferred solve(prob, Rosenbrock23(autodiff=adalg))
+@test_broken sol = @inferred solve(prob, Rodas4(autodiff=adalg), initializealg = ShampineCollocationInit())
+@test_broken sol = @inferred solve(proboop, Rodas5())
+@test_broken sol = @inferred solve(proboop, Rodas4(), initializealg = ShampineCollocationInit())