[WIP] feat: add hooks for OverrideInit

lib/NonlinearSolveBase/src/NonlinearSolveBase.jl

@@ -55,6 +55,7 @@ include("descent/damped_newton.jl")
 include("descent/dogleg.jl")
 include("descent/geodesic_acceleration.jl")
 
+include("initialization.jl")
 include("solve.jl")
 
 # Unexported Public API

lib/NonlinearSolveBase/src/abstract_types.jl

@@ -259,6 +259,8 @@ Abstract Type for all NonlinearSolveBase Caches.
     `u0` and any additional keyword arguments.
   - `SciMLBase.isinplace(cache)`: whether or not the solver is inplace.
   - `CommonSolve.step!(cache; kwargs...)`: See [`CommonSolve.step!`](@ref) for more details.
+  - `get_abstol(cache)`: get the `abstol` provided to the cache.
+  - `get_reltol(cache)`: get the `reltol` provided to the cache.
 
 Additionally implements `SymbolicIndexingInterface` interface Functions.
 
@@ -304,9 +306,16 @@ end
 
 SciMLBase.isinplace(cache::AbstractNonlinearSolveCache) = SciMLBase.isinplace(cache.prob)
 
+function get_abstol(cache::AbstractNonlinearSolveCache)
+    get_abstol(cache.termination_cache)
+end
+function get_reltol(cache::AbstractNonlinearSolveCache)
+    get_reltol(cache.termination_cache)
+end
+
 ## SII Interface
 SII.symbolic_container(cache::AbstractNonlinearSolveCache) = cache.prob
-SII.parameter_values(cache::AbstractNonlinearSolveCache) = SII.parameter_values(cache.prob)
+SII.parameter_values(cache::AbstractNonlinearSolveCache) = cache.p
 SII.state_values(cache::AbstractNonlinearSolveCache) = get_u(cache)
 
 function Base.getproperty(cache::AbstractNonlinearSolveCache, sym::Symbol)

lib/NonlinearSolveBase/src/initialization.jl

@@ -0,0 +1,60 @@
+struct NonlinearSolveDefaultInit <: SciMLBase.DAEInitializationAlgorithm end
+
+function run_initialization!(cache, initializealg = cache.initializealg, prob = cache.prob)
+    _run_initialization!(cache, initializealg, prob, Val(SciMLBase.isinplace(cache)))
+end
+
+function _run_initialization!(
+        cache, ::NonlinearSolveDefaultInit, prob, isinplace::Union{Val{true}, Val{false}})
+    if SciMLBase.has_initialization_data(prob.f) &&
+       prob.f.initialization_data isa SciMLBase.OverrideInitData
+        return _run_initialization!(cache, SciMLBase.OverrideInit(), prob, isinplace)
+    end
+    return cache, true
+end
+
+function _run_initialization!(cache, initalg::SciMLBase.OverrideInit, prob,
+        isinplace::Union{Val{true}, Val{false}})
+    if cache isa AbstractNonlinearSolveCache && isdefined(cache.alg, :autodiff)
+        autodiff = cache.alg.autodiff
+    else
+        autodiff = ADTypes.AutoForwardDiff()
+    end
+    alg = initialization_alg(prob.f.initialization_data.initializeprob, autodiff)
+    if alg === nothing && cache isa AbstractNonlinearSolveCache
+        alg = cache.alg
+    end
+    u0, p, success = SciMLBase.get_initial_values(
+        prob, cache, prob.f, initalg, isinplace; nlsolve_alg = alg,
+        abstol = get_abstol(cache), reltol = get_reltol(cache))
+    cache = update_initial_values!(cache, u0, p)
+    if cache isa AbstractNonlinearSolveCache && isdefined(cache, :retcode) && !success
+        cache.retcode = ReturnCode.InitialFailure
+    end
+
+    return cache, success
+end
+
+function get_abstol(prob::AbstractNonlinearProblem)
+    get_tolerance(get(prob.kwargs, :abstol, nothing), eltype(SII.state_values(prob)))
+end
+function get_reltol(prob::AbstractNonlinearProblem)
+    get_tolerance(get(prob.kwargs, :reltol, nothing), eltype(SII.state_values(prob)))
+end
+
+initialization_alg(initprob, autodiff) = nothing
+
+function update_initial_values!(cache::AbstractNonlinearSolveCache, u0, p)
+    InternalAPI.reinit!(cache; u0, p)
+    cache.prob = SciMLBase.remake(cache.prob; u0, p)
+    return cache
+end
+
+function update_initial_values!(prob::AbstractNonlinearProblem, u0, p)
+    return SciMLBase.remake(prob; u0, p)
+end
+
+function _run_initialization!(
+        cache::AbstractNonlinearSolveCache, ::SciMLBase.NoInit, prob, isinplace)
+    return cache, true
+end

lib/NonlinearSolveBase/src/polyalg.jl

@@ -59,6 +59,23 @@ end
     u0
     u0_aliased
     alias_u0::Bool
+
+    initializealg
+end
+
+function update_initial_values!(cache::NonlinearSolvePolyAlgorithmCache, u0, p)
+    foreach(cache.caches) do subcache
+        update_initial_values!(subcache, u0, p)
+    end
+    cache.prob = SciMLBase.remake(cache.prob; u0, p)
+    return cache
+end
+
+function NonlinearSolveBase.get_abstol(cache::NonlinearSolvePolyAlgorithmCache)
+    NonlinearSolveBase.get_abstol(cache.caches[cache.current])
+end
+function NonlinearSolveBase.get_reltol(cache::NonlinearSolvePolyAlgorithmCache)
+    NonlinearSolveBase.get_reltol(cache.caches[cache.current])
 end
 
 function SII.symbolic_container(cache::NonlinearSolvePolyAlgorithmCache)
@@ -67,6 +84,9 @@ end
 function SII.state_values(cache::NonlinearSolvePolyAlgorithmCache)
     SII.state_values(SII.symbolic_container(cache))
 end
+function SII.parameter_values(cache::NonlinearSolvePolyAlgorithmCache)
+    SII.parameter_values(SII.symbolic_container(cache))
+end
 
 function Base.show(io::IO, ::MIME"text/plain", cache::NonlinearSolvePolyAlgorithmCache)
     println(io, "NonlinearSolvePolyAlgorithmCache with \
@@ -97,7 +117,8 @@ end
 function SciMLBase.__init(
         prob::AbstractNonlinearProblem, alg::NonlinearSolvePolyAlgorithm, args...;
         stats = NLStats(0, 0, 0, 0, 0), maxtime = nothing, maxiters = 1000,
-        internalnorm = L2_NORM, alias_u0 = false, verbose = true, kwargs...
+        internalnorm = L2_NORM, alias_u0 = false, verbose = true,
+        initializealg = NonlinearSolveDefaultInit(), kwargs...
 )
     if alias_u0 && !ArrayInterface.ismutable(prob.u0)
         verbose && @warn "`alias_u0` has been set to `true`, but `u0` is \
@@ -109,18 +130,21 @@ function SciMLBase.__init(
     u0_aliased = alias_u0 ? copy(u0) : u0
     alias_u0 && (prob = SciMLBase.remake(prob; u0 = u0_aliased))
 
-    return NonlinearSolvePolyAlgorithmCache(
+    cache = NonlinearSolvePolyAlgorithmCache(
         alg.static_length, prob,
         map(alg.algs) do solver
             SciMLBase.__init(
                 prob, solver, args...;
-                stats, maxtime, internalnorm, alias_u0, verbose, kwargs...
+                stats, maxtime, internalnorm, alias_u0, verbose,
+                initializealg = SciMLBase.NoInit(), kwargs...
             )
         end,
         alg, -1, alg.start_index, 0, stats, 0.0, maxtime,
         ReturnCode.Default, false, maxiters, internalnorm,
-        u0, u0_aliased, alias_u0
+        u0, u0_aliased, alias_u0, initializealg
     )
+    run_initialization!(cache)
+    return cache
 end
 
 @generated function InternalAPI.step!(

lib/NonlinearSolveBase/src/solve.jl

@@ -7,6 +7,13 @@ function SciMLBase.__solve(
 end
 
 function CommonSolve.solve!(cache::AbstractNonlinearSolveCache)
+    if cache.retcode == ReturnCode.InitialFailure
+        return SciMLBase.build_solution(
+            cache.prob, cache.alg, get_u(cache), get_fu(cache);
+            cache.retcode, cache.stats, cache.trace
+        )
+    end
+
     while not_terminated(cache)
         CommonSolve.step!(cache)
     end
@@ -40,6 +47,17 @@ end
     sol_syms = [gensym("sol") for i in 1:N]
     u_result_syms = [gensym("u_result") for i in 1:N]
 
+    push!(calls,
+        quote
+            if cache.retcode == ReturnCode.InitialFailure
+                u = $(SII.state_values)(cache)
+                return build_solution_less_specialize(
+                    cache.prob, cache.alg, u, $(Utils.evaluate_f)(cache.prob, u);
+                    retcode = cache.retcode
+                )
+            end
+        end)
+
     for i in 1:N
         push!(calls,
             quote
@@ -111,7 +129,8 @@ end
 
 @generated function __generated_polysolve(
         prob::AbstractNonlinearProblem, alg::NonlinearSolvePolyAlgorithm{Val{N}}, args...;
-        stats = NLStats(0, 0, 0, 0, 0), alias_u0 = false, verbose = true, kwargs...
+        stats = NLStats(0, 0, 0, 0, 0), alias_u0 = false, verbose = true,
+        initializealg = NonlinearSolveDefaultInit(), kwargs...
 ) where {N}
     sol_syms = [gensym("sol") for _ in 1:N]
     prob_syms = [gensym("prob") for _ in 1:N]
@@ -123,9 +142,23 @@ end
                               immutable (checked using `ArrayInterface.ismutable`)."
             alias_u0 = false  # If immutable don't care about aliasing
         end
+    end]
+
+    push!(calls,
+        quote
+            prob, success = $(run_initialization!)(prob, initializealg, prob)
+            if !success
+                u = $(SII.state_values)(prob)
+                return build_solution_less_specialize(
+                    prob, alg, u, $(Utils.evaluate_f)(prob, u);
+                    retcode = $(ReturnCode.InitialFailure))
+            end
+        end)
+
+    push!(calls, quote
         u0 = prob.u0
         u0_aliased = alias_u0 ? zero(u0) : u0
-    end]
+    end)
     for i in 1:N
         cur_sol = sol_syms[i]
         push!(calls,
@@ -246,6 +279,23 @@ end
     alg
     args
     kwargs::Any
+    initializealg
+
+    retcode::ReturnCode.T
+end
+
+function get_abstol(cache::NonlinearSolveNoInitCache)
+    get(cache.kwargs, :abstol, get_tolerance(nothing, eltype(cache.prob.u0)))
+end
+function get_reltol(cache::NonlinearSolveNoInitCache)
+    get(cache.kwargs, :reltol, get_tolerance(nothing, eltype(cache.prob.u0)))
+end
+
+SII.parameter_values(cache::NonlinearSolveNoInitCache) = SII.parameter_values(cache.prob)
+SII.state_values(cache::NonlinearSolveNoInitCache) = SII.state_values(cache.prob)
+
+function update_parameter_object!(cache::NonlinearSolveNoInitCache, p)
+    SciMLBase.reinit!(cache, cache.prob.u0, p)
 end
 
 get_u(cache::NonlinearSolveNoInitCache) = SII.state_values(cache.prob)
@@ -264,11 +314,20 @@ end
 
 function SciMLBase.__init(
         prob::AbstractNonlinearProblem, alg::AbstractNonlinearSolveAlgorithm, args...;
+        initializealg = NonlinearSolveDefaultInit(),
         kwargs...
 )
-    return NonlinearSolveNoInitCache(prob, alg, args, kwargs)
+    cache = NonlinearSolveNoInitCache(
+        prob, alg, args, kwargs, initializealg, ReturnCode.Success)
+    run_initialization!(cache)
+    return cache
 end
 
 function CommonSolve.solve!(cache::NonlinearSolveNoInitCache)
+    if cache.retcode == ReturnCode.InitialFailure
+        u = SII.state_values(cache)
+        return SciMLBase.build_solution(
+            cache.prob, cache.alg, u, Utils.evaluate_f(cache.prob, u); cache.retcode)
+    end
     return CommonSolve.solve(cache.prob, cache.alg, cache.args...; cache.kwargs...)
 end

lib/NonlinearSolveBase/src/termination_conditions.jl

@@ -23,6 +23,9 @@ const AbsNormModes = Union{
     u_diff_cache::uType
 end
 
+get_abstol(cache::NonlinearTerminationModeCache) = cache.abstol
+get_reltol(cache::NonlinearTerminationModeCache) = cache.reltol
+
 function update_u!!(cache::NonlinearTerminationModeCache, u)
     cache.u === nothing && return
     if cache.u isa AbstractArray && ArrayInterface.can_setindex(cache.u)

lib/NonlinearSolveFirstOrder/src/solve.jl

@@ -87,6 +87,8 @@ end
     retcode::ReturnCode.T
     force_stop::Bool
     kwargs
+
+    initializealg
 end
 
 function InternalAPI.reinit_self!(
@@ -121,7 +123,7 @@ function SciMLBase.__init(
         stats = NLStats(0, 0, 0, 0, 0), alias_u0 = false, maxiters = 1000,
         abstol = nothing, reltol = nothing, maxtime = nothing,
         termination_condition = nothing, internalnorm = L2_NORM,
-        linsolve_kwargs = (;), kwargs...
+        linsolve_kwargs = (;), initializealg = NonlinearSolveBase.NonlinearSolveDefaultInit(), kwargs...
 )
     @set! alg.autodiff = NonlinearSolveBase.select_jacobian_autodiff(prob, alg.autodiff)
     provided_jvp_autodiff = alg.jvp_autodiff !== nothing
@@ -206,13 +208,17 @@ function SciMLBase.__init(
             prob, alg, u, fu, J, du; kwargs...
         )
 
-        return GeneralizedFirstOrderAlgorithmCache(
+        cache = GeneralizedFirstOrderAlgorithmCache(
             fu, u, u_cache, prob.p, du, J, alg, prob, globalization,
             jac_cache, descent_cache, linesearch_cache, trustregion_cache,
             stats, 0, maxiters, maxtime, alg.max_shrink_times, timer,
-            0.0, true, termination_cache, trace, ReturnCode.Default, false, kwargs
+            0.0, true, termination_cache, trace, ReturnCode.Default, false, kwargs,
+            initializealg
         )
     end
+
+    NonlinearSolveBase.run_initialization!(cache)
+    return cache
 end
 
 function InternalAPI.step!(

lib/NonlinearSolveQuasiNewton/src/solve.jl

@@ -93,6 +93,16 @@ end
     force_stop::Bool
     force_reinit::Bool
     kwargs
+
+    # Initialization
+    initializealg
+end
+
+function NonlinearSolveBase.get_abstol(cache::QuasiNewtonCache)
+    NonlinearSolveBase.get_abstol(cache.termination_cache)
+end
+function NonlinearSolveBase.get_reltol(cache::QuasiNewtonCache)
+    NonlinearSolveBase.get_reltol(cache.termination_cache)
 end
 
 function InternalAPI.reinit_self!(
@@ -130,7 +140,8 @@ function SciMLBase.__init(
         stats = NLStats(0, 0, 0, 0, 0), alias_u0 = false, maxtime = nothing,
         maxiters = 1000, abstol = nothing, reltol = nothing,
         linsolve_kwargs = (;), termination_condition = nothing,
-        internalnorm::F = L2_NORM, kwargs...
+        internalnorm::F = L2_NORM, initializealg = NonlinearSolveBase.NonlinearSolveDefaultInit(),
+        kwargs...
 ) where {F}
     timer = get_timer_output()
     @static_timeit timer "cache construction" begin
@@ -204,15 +215,18 @@ function SciMLBase.__init(
             uses_jacobian_inverse = inverted_jac, kwargs...
         )
 
-        return QuasiNewtonCache(
+        cache = QuasiNewtonCache(
             fu, u, u_cache, prob.p, du, J, alg, prob, globalization,
             initialization_cache, descent_cache, linesearch_cache,
             trustregion_cache, update_rule_cache, reinit_rule_cache,
             inv_workspace, stats, 0, 0, alg.max_resets, maxiters, maxtime,
             alg.max_shrink_times, 0, timer, 0.0, termination_cache, trace,
-            ReturnCode.Default, false, false, kwargs
+            ReturnCode.Default, false, false, kwargs, initializealg
         )
     end
+
+    NonlinearSolveBase.run_initialization!(cache)
+    return cache
 end
 
 function InternalAPI.step!(