Fix matrix resizing

Author: avik-pal

src/gaussnewton.jl

@@ -113,8 +113,8 @@ function perform_step!(cache::GaussNewtonCache{true})
     jacobian!!(J, cache)
 
     if JᵀJ !== nothing
-        __matmul!(JᵀJ, J', J)
-        __matmul!(Jᵀf, J', fu1)
+        __update_JᵀJ!(Val{true}(), cache, :JᵀJ, J)
+        __update_Jᵀf!(Val{true}(), cache, :Jᵀf, :JᵀJ, J, fu1)
     end
 
     # u = u - JᵀJ \ Jᵀfu
@@ -151,8 +151,8 @@ function perform_step!(cache::GaussNewtonCache{false})
     cache.J = jacobian!!(cache.J, cache)
 
     if cache.JᵀJ !== nothing
-        cache.JᵀJ = cache.J' * cache.J
-        cache.Jᵀf = cache.J' * fu1
+        __update_JᵀJ!(Val{false}(), cache, :JᵀJ, cache.J)
+        __update_Jᵀf!(Val{false}(), cache, :Jᵀf, :JᵀJ, cache.J, fu1)
     end
 
     # u = u - J \ fu

src/jacobian.jl

@@ -180,7 +180,7 @@ __maybe_symmetric(x::Number) = x
 __maybe_symmetric(x::StaticArray) = x
 __maybe_symmetric(x::SparseArrays.AbstractSparseMatrix) = x
 __maybe_symmetric(x::SciMLOperators.AbstractSciMLOperator) = x
-__maybe_symmetric(x::KrylovJᵀJ) = x
+__maybe_symmetric(x::KrylovJᵀJ) = x.JᵀJ
 
 ## Special Handling for Scalars
 function jacobian_caches(alg::AbstractNonlinearSolveAlgorithm, f::F, u::Number, p,
@@ -204,16 +204,16 @@ function __update_Jᵀf!(iip::Val, cache, sym1::Symbol, sym2::Symbol, J, fu)
     return __update_Jᵀf!(iip, cache, sym1, sym2, getproperty(cache, sym2), J, fu)
 end
 function __update_Jᵀf!(::Val{false}, cache, sym1::Symbol, sym2::Symbol, _, J, fu)
-    return setproperty!(cache, sym1, J' * fu)
+    return setproperty!(cache, sym1, _restructure(getproperty(cache, sym1), J' * fu))
 end
 function __update_Jᵀf!(::Val{true}, cache, sym1::Symbol, sym2::Symbol, _, J, fu)
-    return mul!(getproperty(cache, sym1), J', fu)
+    return mul!(_vec(getproperty(cache, sym1)), J', fu)
 end
 function __update_Jᵀf!(::Val{false}, cache, sym1::Symbol, sym2::Symbol, H::KrylovJᵀJ, J, fu)
-    return setproperty!(cache, sym1, H.Jᵀ * fu)
+    return setproperty!(cache, sym1, _restructure(getproperty(cache, sym1), H.Jᵀ * fu))
 end
 function __update_Jᵀf!(::Val{true}, cache, sym1::Symbol, sym2::Symbol, H::KrylovJᵀJ, J, fu)
-    return mul!(getproperty(cache, sym1), H.Jᵀ, fu)
+    return mul!(_vec(getproperty(cache, sym1)), H.Jᵀ, fu)
 end
 
 # Left-Right Multiplication

src/trustRegion.jl

@@ -239,19 +239,16 @@ function SciMLBase.__init(prob::NonlinearProblem{uType, iip}, alg_::TrustRegion,
     fu_prev = zero(fu1)
 
     loss = get_loss(fu1)
-    # uf, linsolve, J, fu2, jac_cache, du = jacobian_caches(alg, f, u, p, Val(iip);
-    # linsolve_kwargs)
     uf, _, J, fu2, jac_cache, du, H, g = jacobian_caches(alg, f, u, p, Val(iip);
         linsolve_kwargs, linsolve_with_JᵀJ = Val(true), lininit = Val(false))
+    g = _restructure(fu1, g)
     linsolve = u isa Number ? nothing : __setup_linsolve(J, fu2, du, p, alg)
 
     u_tmp = zero(u)
     u_cauchy = zero(u)
     u_gauss_newton = _mutable_zero(u)
 
     loss_new = loss
-    # H = zero(J' * J)
-    # g = _mutable_zero(fu1)
     shrink_counter = 0
     fu_new = zero(fu1)
     make_new_J = true
@@ -351,9 +348,7 @@ function perform_step!(cache::TrustRegionCache{true})
     if cache.make_new_J
         jacobian!!(J, cache)
         __update_JᵀJ!(Val{true}(), cache, :H, J)
-        # mul!(cache.H, J', J)
-        __update_Jᵀf!(Val{true}(), cache, :g, :H, J, fu)
-        # mul!(_vec(cache.g), J', _vec(fu))
+        __update_Jᵀf!(Val{true}(), cache, :g, :H, J, _vec(fu))
         cache.stats.njacs += 1
 
         # do not use A = cache.H, b = _vec(cache.g) since it is equivalent
@@ -383,7 +378,7 @@ function perform_step!(cache::TrustRegionCache{false})
     if make_new_J
         J = jacobian!!(cache.J, cache)
         __update_JᵀJ!(Val{false}(), cache, :H, J)
-        __update_Jᵀf!(Val{false}(), cache, :g, :H, J, fu)
+        __update_Jᵀf!(Val{false}(), cache, :g, :H, J, _vec(fu))
         cache.stats.njacs += 1
 
         if cache.linsolve === nothing
@@ -420,8 +415,8 @@ function retrospective_step!(cache::TrustRegionCache)
         cache.H = J' * J
         cache.g = J' * fu
     else
-        mul!(cache.H, J', J)
-        mul!(cache.g, J', fu)
+        __update_JᵀJ!(Val{isinplace(cache)}(), cache, :H, J)
+        __update_Jᵀf!(Val{isinplace(cache)}(), cache, :g, :H, J, fu)
     end
     cache.stats.njacs += 1
     @unpack H, g, du = cache