feat: support parameter updates in initialize_dae!

Author: AayushSabharwal

lib/OrdinaryDiffEqCore/Project.toml

@@ -5,6 +5,7 @@ version = "1.6.1"
 
 [deps]
 ADTypes = "47edcb42-4c32-4615-8424-f2b9edc5f35b"
+Accessors = "7d9f7c33-5ae7-4f3b-8dc6-eff91059b697"
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
 ArrayInterface = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
@@ -42,6 +43,7 @@ OrdinaryDiffEqCoreEnzymeCoreExt = "EnzymeCore"
 
 [compat]
 ADTypes = "0.2, 1"
+Accessors = "0.1.36"
 Adapt = "3.0, 4"
 ArrayInterface = "7"
 DataStructures = "0.18"

lib/OrdinaryDiffEqCore/src/OrdinaryDiffEqCore.jl

@@ -70,6 +70,7 @@ import DiffEqBase: calculate_residuals,
 import Polyester
 using MacroTools, Adapt
 import ADTypes: AutoFiniteDiff, AutoForwardDiff
+import Accessors: @reset
 
 using SciMLStructures: canonicalize, Tunable, isscimlstructure
 

lib/OrdinaryDiffEqCore/src/initialize_dae.jl

@@ -153,6 +153,10 @@ function _initialize_dae!(integrator, prob::Union{ODEProblem, DAEProblem},
         alg::OverrideInit, isinplace::Union{Val{true}, Val{false}})
     initializeprob = prob.f.initializeprob
 
+    if SciMLBase.has_update_initializeprob!(prob.f)
+        prob.f.update_initializeprob!(initializeprob, prob)
+    end
+
     # If it doesn't have autodiff, assume it comes from symbolic system like ModelingToolkit
     # Since then it's the case of not a DAE but has initializeprob
     # In which case, it should be differentiable
@@ -173,6 +177,12 @@ function _initialize_dae!(integrator, prob::Union{ODEProblem, DAEProblem},
     else
         error("Unreachable reached. Report this error.")
     end
+    if SciMLBase.has_initializeprobpmap(prob.f)
+        integrator.p = prob.f.initializeprobpmap(prob, nlsol)
+        sol = integrator.sol
+        @reset sol.prob.p = integrator.p
+        integrator.sol = sol
+    end
 
     if nlsol.retcode != ReturnCode.Success
         integrator.sol = SciMLBase.solution_new_retcode(integrator.sol,