fix: support GPUs again

src/systems/nonlinear/initializesystem.jl

@@ -669,7 +669,7 @@ function SciMLBase.remake_initialization_data(
 end
 
 promote_type_with_nothing(::Type{T}, ::Nothing) where {T} = T
-promote_type_with_nothing(::Type{T}, ::SizedVector{0}) where {T} = T
+promote_type_with_nothing(::Type{T}, ::StaticVector{0}) where {T} = T
 function promote_type_with_nothing(::Type{T}, ::AbstractArray{T2}) where {T, T2}
     promote_type(T, T2)
 end
@@ -678,7 +678,7 @@ function promote_type_with_nothing(::Type{T}, p::MTKParameters) where {T}
 end
 
 promote_with_nothing(::Type, ::Nothing) = nothing
-promote_with_nothing(::Type, x::SizedVector{0}) = x
+promote_with_nothing(::Type, x::StaticVector{0}) = x
 promote_with_nothing(::Type{T}, x::AbstractArray{T}) where {T} = x
 function promote_with_nothing(::Type{T}, x::AbstractArray{T2}) where {T, T2}
     if ArrayInterface.ismutable(x)

src/systems/parameter_buffer.jl

@@ -10,6 +10,26 @@ struct MTKParameters{T, I, D, C, N, H}
     constant::C
     nonnumeric::N
     caches::H
+
+    function MTKParameters{T, I, D, C, N, H}(tunables::T, initials::I, discrete::D,
+                                             constant::C, nonnumeric::N,
+                                             caches::H) where {T, I, D, C, N, H}
+        if tunables isa StaticVector{0}
+            tunables = SVector{0, eltype(tunables)}()
+        end
+        if initials isa StaticVector{0}
+            initials = SVector{0, eltype(initials)}()
+        end
+        return new{typeof(tunables), typeof(initials), D, C, N, H}(tunables, initials,
+                                                                   discrete, constant,
+                                                                   nonnumeric, caches)
+    end
+    function MTKParameters(tunables::T, initials::I, discrete::D,
+                                             constant::C, nonnumeric::N,
+                                             caches::H) where {T, I, D, C, N, H}
+        return MTKParameters{T, I, D, C, N, H}(tunables, initials, discrete, constant,
+                                               nonnumeric, caches)
+    end
 end
 
 """
@@ -138,11 +158,11 @@ function MTKParameters(
     end
     tunable_buffer = narrow_buffer_type(tunable_buffer; p_constructor)
     if isempty(tunable_buffer)
-        tunable_buffer = SizedVector{0, Float64}()
+        tunable_buffer = SVector{0, Float64}()
     end
     initials_buffer = narrow_buffer_type(initials_buffer; p_constructor)
     if isempty(initials_buffer)
-        initials_buffer = SizedVector{0, Float64}()
+        initials_buffer = SVector{0, Float64}()
     end
     disc_buffer = narrow_buffer_type.(disc_buffer; p_constructor)
     const_buffer = narrow_buffer_type.(const_buffer; p_constructor)
@@ -879,10 +899,10 @@ end
 @generated function Base.getindex(
         ps::MTKParameters{T, I, D, C, N, H}, idx::Int) where {T, I, D, C, N, H}
     paths = []
-    if !(T <: SizedVector{0})
+    if !(T <: StaticVector{0})
         push!(paths, :(ps.tunable))
     end
-    if !(I <: SizedVector{0})
+    if !(I <: StaticVector{0})
         push!(paths, :(ps.initials))
     end
     for i in 1:fieldcount(D)
@@ -909,10 +929,10 @@ end
 @generated function Base.length(ps::MTKParameters{
         T, I, D, C, N, H}) where {T, I, D, C, N, H}
     len = 0
-    if !(T <: SizedVector{0})
+    if !(T <: SVector{0})
         len += 1
     end
-    if !(I <: SizedVector{0})
+    if !(I <: SVector{0})
         len += 1
     end
     len += fieldcount(D) + fieldcount(C) + fieldcount(N) + fieldcount(H)

src/systems/problem_utils.jl

@@ -780,7 +780,7 @@ function get_mtkparameters_reconstructor(srcsys::AbstractSystem, dstsys::Abstrac
     # `syms[1]` is always the tunables because `srcsys` will have initials.
     tunable_syms = syms[1]
     tunable_getter = if isempty(tunable_syms)
-        Returns(SizedVector{0, Float64}())
+        Returns(SVector{0, Float64}())
     else
         p_constructor ∘ concrete_getu(srcsys, tunable_syms; eval_expression, eval_module)
     end
@@ -803,7 +803,7 @@ function get_mtkparameters_reconstructor(srcsys::AbstractSystem, dstsys::Abstrac
         end
         p_constructor ∘ concrete_getu(srcsys, initsyms; eval_expression, eval_module)
     else
-        Returns(SizedVector{0, Float64}())
+        Returns(SVector{0, Float64}())
     end
     discs_getter = if isempty(syms[3])
         Returns(())
@@ -923,7 +923,7 @@ function (rip::ReconstructInitializeprob)(srcvalp, dstvalp)
     if newp isa MTKParameters
         # and initials portion
         buf, repack, alias = SciMLStructures.canonicalize(SciMLStructures.Initials(), newp)
-        if eltype(buf) != T
+        if eltype(buf) != T && !(buf isa SVector{0})
             newbuf = similar(buf, T)
             copyto!(newbuf, buf)
             newp = repack(newbuf)
@@ -1148,8 +1148,10 @@ function maybe_build_initialization_problem(
     if is_split(sys)
         buffer, repack, _ = SciMLStructures.canonicalize(SciMLStructures.Tunable(), initp)
         initp = repack(floatT.(buffer))
-        buffer, repack, _ = SciMLStructures.canonicalize(SciMLStructures.Initials(), initp)
-        initp = repack(floatT.(buffer))
+        if !(initp.initials isa StaticVector{0})
+            buffer, repack, _ = SciMLStructures.canonicalize(SciMLStructures.Initials(), initp)
+            initp = repack(floatT.(buffer))
+        end
     elseif initp isa AbstractArray
         if ArrayInterface.ismutable(initp)
             initp′ = similar(initp, floatT)

test/mtkparameters.jl

@@ -429,3 +429,13 @@ end
     grad = ForwardDiff.gradient(Base.Fix2(loss, (setter, prob)), [3.0])
     @test grad ≈ [0.14882627068752538] atol=1e-10
 end
+
+@testset "MTKParameters can be made `isbits`" begin
+    @variables x(t)
+    @parameters p
+    @named sys = System(D(x) ~ x * p, t)
+    sys = complete(sys)
+    prob = ODEProblem(sys, SA[x => 1.0, p => 1.0], (0.0, 1.0))
+    @test isbits(prob.p)
+    @test isbits(prob.f.initialization_data.initializeprob.p)
+end

test/split_parameters.jl

@@ -6,7 +6,6 @@ using BlockArrays: BlockedArray
 using ModelingToolkit: t_nounits as t, D_nounits as D
 using ModelingToolkit: MTKParameters, ParameterIndex, NONNUMERIC_PORTION
 using SciMLStructures: Tunable, Discrete, Constants, Initials
-using StaticArrays: SizedVector
 using SymbolicIndexingInterface: is_parameter, getp
 
 x = [1, 2.0, false, [1, 2, 3], Parameter(1.0)]