Add caching for solvers without init

Project.toml

@@ -1,7 +1,7 @@
 name = "NonlinearSolve"
 uuid = "8913a72c-1f9b-4ce2-8d82-65094dcecaec"
 authors = ["SciML"]
-version = "3.6.0"
+version = "3.7.0"
 
 [deps]
 ADTypes = "47edcb42-4c32-4615-8424-f2b9edc5f35b"

ext/NonlinearSolveLeastSquaresOptimExt.jl

@@ -23,6 +23,10 @@ end
     kwargs
 end
 
+function Base.show(io::IO, cache::LeastSquaresOptimJLCache)
+    print(io, "LeastSquaresOptimJLCache()")
+end
+
 function SciMLBase.reinit!(cache::LeastSquaresOptimJLCache, args...; kwargs...)
     error("Reinitialization not supported for LeastSquaresOptimJL.")
 end

ext/NonlinearSolveNLSolversExt.jl

@@ -4,8 +4,8 @@ using ADTypes, FastClosures, NonlinearSolve, NLSolvers, SciMLBase, LinearAlgebra
 using FiniteDiff, ForwardDiff
 
 function SciMLBase.__solve(prob::NonlinearProblem, alg::NLSolversJL, args...;
-        abstol = nothing, reltol = nothing, maxiters = 1000, alias_u0::Bool = false,
-        termination_condition = nothing, kwargs...)
+        abstol = nothing, reltol = nothing, maxiters = 1000,
+        alias_u0::Bool = false, termination_condition = nothing, kwargs...)
     NonlinearSolve.__test_termination_condition(termination_condition, :NLSolversJL)
 
     abstol = NonlinearSolve.DEFAULT_TOLERANCE(abstol, eltype(prob.u0))
@@ -50,12 +50,13 @@ function SciMLBase.__solve(prob::NonlinearProblem, alg::NLSolversJL, args...;
         prob_nlsolver = NEqProblem(prob_obj; inplace = false)
         res = NLSolvers.solve(prob_nlsolver, prob.u0, alg.method, options)
 
-        retcode = ifelse(norm(res.info.best_residual, Inf) ≤ abstol, ReturnCode.Success,
-            ReturnCode.MaxIters)
+        retcode = ifelse(norm(res.info.best_residual, Inf) ≤ abstol,
+            ReturnCode.Success, ReturnCode.MaxIters)
         stats = SciMLBase.NLStats(-1, -1, -1, -1, res.info.iter)
 
-        return SciMLBase.build_solution(prob, alg, res.info.solution,
-            res.info.best_residual; retcode, original = res, stats)
+        return SciMLBase.build_solution(
+            prob, alg, res.info.solution, res.info.best_residual;
+            retcode, original = res, stats)
     end
 
     f!, u0, resid = NonlinearSolve.__construct_extension_f(prob; alias_u0)
@@ -73,12 +74,12 @@ function SciMLBase.__solve(prob::NonlinearProblem, alg::NLSolversJL, args...;
 
     res = NLSolvers.solve(prob_nlsolver, u0, alg.method, options)
 
-    retcode = ifelse(norm(res.info.best_residual, Inf) ≤ abstol, ReturnCode.Success,
-        ReturnCode.MaxIters)
+    retcode = ifelse(
+        norm(res.info.best_residual, Inf) ≤ abstol, ReturnCode.Success, ReturnCode.MaxIters)
     stats = SciMLBase.NLStats(-1, -1, -1, -1, res.info.iter)
 
-    return SciMLBase.build_solution(prob, alg, res.info.solution,
-        res.info.best_residual; retcode, original = res, stats)
+    return SciMLBase.build_solution(prob, alg, res.info.solution, res.info.best_residual;
+        retcode, original = res, stats)
 end
 
 end

src/NonlinearSolve.jl

@@ -66,6 +66,7 @@ include("core/generic.jl")
 include("core/approximate_jacobian.jl")
 include("core/generalized_first_order.jl")
 include("core/spectral_methods.jl")
+include("core/noinit.jl")
 
 include("algorithms/raphson.jl")
 include("algorithms/pseudo_transient.jl")

src/abstract_types.jl

@@ -214,6 +214,9 @@ get_u(cache::AbstractNonlinearSolveCache) = cache.u
 set_fu!(cache::AbstractNonlinearSolveCache, fu) = (cache.fu = fu)
 SciMLBase.set_u!(cache::AbstractNonlinearSolveCache, u) = (cache.u = u)
 
+function SciMLBase.reinit!(cache::AbstractNonlinearSolveCache; kwargs...)
+    return reinit_cache!(cache; kwargs...)
+end
 function SciMLBase.reinit!(cache::AbstractNonlinearSolveCache, u0; kwargs...)
     return reinit_cache!(cache; u0, kwargs...)
 end

src/core/noinit.jl

@@ -0,0 +1,37 @@
+# Some algorithms don't support creating a cache and doing `solve!`, this unfortunately
+# makes it difficult to write generic code that supports caching. For the algorithms that
+# don't have a `__init` function defined, we create a "Fake Cache", which just calls
+# `__solve` from `solve!`
+@concrete mutable struct NonlinearSolveNoInitCache{iip, timeit} <:
+                         AbstractNonlinearSolveCache{iip, timeit}
+    prob
+    alg
+    args
+    kwargs::Any
+end
+
+function SciMLBase.reinit!(cache::NonlinearSolveNoInitCache, u0 = cache.prob.u0;
+        p = cache.prob.p, kwargs...)
+    prob = remake(cache.prob; u0, p)
+    cache.prob = prob
+    cache.kwargs = merge(cache.kwargs, kwargs)
+    return cache
+end
+
+function Base.show(io::IO, cache::NonlinearSolveNoInitCache)
+    print(io, "NonlinearSolveNoInitCache(alg = $(cache.alg))")
+end
+
+function SciMLBase.__init(prob::AbstractNonlinearProblem{uType, iip},
+        alg::Union{AbstractNonlinearSolveAlgorithm,
+            SimpleNonlinearSolve.AbstractSimpleNonlinearSolveAlgorithm},
+        args...;
+        maxtime = nothing,
+        kwargs...) where {uType, iip}
+    return NonlinearSolveNoInitCache{iip, maxtime !== nothing}(
+        prob, alg, args, merge((; maxtime), kwargs))
+end
+
+function SciMLBase.solve!(cache::NonlinearSolveNoInitCache)
+    return solve(cache.prob, cache.alg, cache.args...; cache.kwargs...)
+end

test/misc/noinit_caching_tests.jl

@@ -0,0 +1,23 @@
+@testitem "NoInit Caching" begin
+    using LinearAlgebra
+    import NLsolve, NLSolvers
+
+    solvers = [SimpleNewtonRaphson(), SimpleTrustRegion(), SimpleDFSane(), NLsolveJL(),
+        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking()))]
+
+    prob = NonlinearProblem((u, p) -> u .^ 2 .- p, [0.1, 0.3], 2.0)
+
+    for alg in solvers
+        cache = init(prob, alg)
+        sol = solve!(cache)
+        @test SciMLBase.successful_retcode(sol)
+        @test norm(sol.resid, Inf) ≤ 1e-6
+
+        reinit!(cache; p = 5.0)
+        @test cache.prob.p == 5.0
+        sol = solve!(cache)
+        @test SciMLBase.successful_retcode(sol)
+        @test norm(sol.resid, Inf) ≤ 1e-6
+        @test norm(sol.u .^ 2 .- 5.0, Inf) ≤ 1e-6
+    end
+end

test/wrappers/rootfind_tests.jl

@@ -16,7 +16,8 @@ end
     prob_iip = SteadyStateProblem(f_iip, u0)
 
     for alg in [
-        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())), NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL()]
+        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())),
+        NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL()]
         sol = solve(prob_iip, alg)
         @test SciMLBase.successful_retcode(sol.retcode)
         @test maximum(abs, sol.resid) < 1e-6
@@ -28,7 +29,8 @@ end
     prob_oop = SteadyStateProblem(f_oop, u0)
 
     for alg in [
-        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())), NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL()]
+        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())),
+        NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL()]
         sol = solve(prob_oop, alg)
         @test SciMLBase.successful_retcode(sol.retcode)
         @test maximum(abs, sol.resid) < 1e-6
@@ -45,7 +47,8 @@ end
     prob_iip = NonlinearProblem{true}(f_iip, u0)
 
     for alg in [
-        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())), NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL()]
+        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())),
+        NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL()]
         local sol
         sol = solve(prob_iip, alg)
         @test SciMLBase.successful_retcode(sol.retcode)
@@ -57,7 +60,8 @@ end
     u0 = zeros(2)
     prob_oop = NonlinearProblem{false}(f_oop, u0)
     for alg in [
-        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())), NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL()]
+        NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())),
+        NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL()]
         local sol
         sol = solve(prob_oop, alg)
         @test SciMLBase.successful_retcode(sol.retcode)
@@ -70,8 +74,7 @@ end
     for tol in [1e-1, 1e-3, 1e-6, 1e-10, 1e-15],
         alg in [
             NLSolversJL(NLSolvers.LineSearch(NLSolvers.Newton(), NLSolvers.Backtracking())),
-            NLsolveJL(),
-            CMINPACK(), SIAMFANLEquationsJL(; method = :newton),
+            NLsolveJL(), CMINPACK(), SIAMFANLEquationsJL(; method = :newton),
             SIAMFANLEquationsJL(; method = :pseudotransient),
             SIAMFANLEquationsJL(; method = :secant)]