fix: fix vectorization of array variables with inputs

Author: AayushSabharwal

src/systems/abstractsystem.jl

@@ -224,7 +224,7 @@ function wrap_assignments(isscalar, assignments; let_block = false)
 end
 
 function wrap_array_vars(
-        sys::AbstractSystem, exprs; dvs = unknowns(sys), ps = parameters(sys))
+        sys::AbstractSystem, exprs; dvs = unknowns(sys), ps = parameters(sys), inputs = nothing)
     isscalar = !(exprs isa AbstractArray)
     array_vars = Dict{Any, AbstractArray{Int}}()
     if dvs !== nothing
@@ -235,16 +235,42 @@ function wrap_array_vars(
                 push!(inds, j)
             end
         end
+        for (k, inds) in array_vars
+            if inds == (inds′ = inds[1]:inds[end])
+                array_vars[k] = inds′
+            end
+        end
+
         uind = 1
     else
         uind = 0
     end
-    # tunables are scalarized and concatenated, so we need to have assignments
-    # for the non-scalarized versions
-    array_tunables = Dict{Any, Tuple{AbstractArray{Int}, Tuple{Vararg{Int}}}}()
-    # Other parameters may be scalarized arrays but used in the vector form
+    # values are (indexes, index of buffer, size of parameter)
+    array_parameters = Dict{Any, Tuple{AbstractArray{Int}, Int, Tuple{Vararg{Int}}}}()
+    # If for some reason different elements of an array parameter are in different buffers
     other_array_parameters = Dict{Any, Any}()
 
+    hasinputs = inputs !== nothing
+    input_vars = Dict{Any, AbstractArray{Int}}()
+    if hasinputs
+        for (j, x) in enumerate(inputs)
+            if iscall(x) && operation(x) == getindex
+                arg = arguments(x)[1]
+                inds = get!(() -> Int[], input_vars, arg)
+                push!(inds, j)
+            end
+        end
+        for (k, inds) in input_vars
+            if inds == (inds′ = inds[1]:inds[end])
+                input_vars[k] = inds′
+            end
+        end
+    end
+    if has_index_cache(sys)
+        ic = get_index_cache(sys)
+    else
+        ic = nothing
+    end
     if ps isa Tuple && eltype(ps) <: AbstractArray
         ps = Iterators.flatten(ps)
     end
@@ -257,25 +283,33 @@ function wrap_array_vars(
         scal = collect(p)
         # all scalarized variables are in `ps`
         any(isequal(p), ps) || all(x -> any(isequal(x), ps), scal) || continue
-        (haskey(array_tunables, p) || haskey(other_array_parameters, p)) && continue
+        (haskey(array_parameters, p) || haskey(other_array_parameters, p)) && continue
 
         idx = parameter_index(sys, p)
         idx isa Int && continue
         if idx isa ParameterIndex
             if idx.portion != SciMLStructures.Tunable()
                 continue
             end
-            idxs = vec(idx.idx)
-            sz = size(idx.idx)
+            array_parameters[p] = (vec(idx.idx), 1, size(idx.idx))
         else
             # idx === nothing
             idxs = map(Base.Fix1(parameter_index, sys), scal)
-            if all(x -> x isa ParameterIndex && x.portion isa SciMLStructures.Tunable, idxs)
-                idxs = map(x -> x.idx, idxs)
-            end
-            if !all(x -> x isa Int, idxs)
-                other_array_parameters[p] = scal
-                continue
+            if first(idxs) isa ParameterIndex
+                buffer_idxs = map(Base.Fix1(iterated_buffer_index, ic), idxs)
+                if allequal(buffer_idxs)
+                    buffer_idx = first(buffer_idxs)
+                    if first(idxs).portion == SciMLStructures.Tunable()
+                        idxs = map(x -> x.idx, idxs)
+                    else
+                        idxs = map(x -> x.idx[end], idxs)
+                    end
+                else
+                    other_array_parameters[p] = scal
+                    continue
+                end
+            else
+                buffer_idx = 1
             end
 
             sz = size(idxs)
@@ -285,12 +319,7 @@ function wrap_array_vars(
                 idxs = idxs[begin]:-1:idxs[end]
             end
             idxs = vec(idxs)
-        end
-        array_tunables[p] = (idxs, sz)
-    end
-    for (k, inds) in array_vars
-        if inds == (inds′ = inds[1]:inds[end])
-            array_vars[k] = inds′
+            array_parameters[p] = (idxs, buffer_idx, sz)
         end
     end
     if isscalar
@@ -301,8 +330,12 @@ function wrap_array_vars(
                 Let(
                     vcat(
                         [k ← :(view($(expr.args[uind].name), $v)) for (k, v) in array_vars],
-                        [k ← :(reshape(view($(expr.args[uind + 1].name), $idxs), $sz))
-                         for (k, (idxs, sz)) in array_tunables],
+                        [k ← :(view($(expr.args[uind + hasinputs].name), $v))
+                         for (k, v) in input_vars],
+                        [k ← :(reshape(
+                             view($(expr.args[uind + hasinputs + buffer_idx].name), $idxs),
+                             $sz))
+                         for (k, (idxs, buffer_idx, sz)) in array_parameters],
                         [k ← Code.MakeArray(v, symtype(k))
                          for (k, v) in other_array_parameters]
                     ),
@@ -319,8 +352,12 @@ function wrap_array_vars(
                 Let(
                     vcat(
                         [k ← :(view($(expr.args[uind].name), $v)) for (k, v) in array_vars],
-                        [k ← :(reshape(view($(expr.args[uind + 1].name), $idxs), $sz))
-                         for (k, (idxs, sz)) in array_tunables],
+                        [k ← :(view($(expr.args[uind + hasinputs].name), $v))
+                         for (k, v) in input_vars],
+                        [k ← :(reshape(
+                             view($(expr.args[uind + hasinputs + buffer_idx].name), $idxs),
+                             $sz))
+                         for (k, (idxs, buffer_idx, sz)) in array_parameters],
                         [k ← Code.MakeArray(v, symtype(k))
                          for (k, v) in other_array_parameters]
                     ),
@@ -337,8 +374,13 @@ function wrap_array_vars(
                     vcat(
                         [k ← :(view($(expr.args[uind + 1].name), $v))
                          for (k, v) in array_vars],
-                        [k ← :(reshape(view($(expr.args[uind + 2].name), $idxs), $sz))
-                         for (k, (idxs, sz)) in array_tunables],
+                        [k ← :(view($(expr.args[uind + hasinputs + 1].name), $v))
+                         for (k, v) in input_vars],
+                        [k ← :(reshape(
+                             view($(expr.args[uind + hasinputs + buffer_idx + 1].name),
+                                 $idxs),
+                             $sz))
+                         for (k, (idxs, buffer_idx, sz)) in array_parameters],
                         [k ← Code.MakeArray(v, symtype(k))
                          for (k, v) in other_array_parameters]
                     ),

src/systems/diffeqs/odesystem.jl

@@ -498,9 +498,9 @@ function build_explicit_observed_function(sys, ts;
     pre = get_postprocess_fbody(sys)
 
     array_wrapper = if param_only
-        wrap_array_vars(sys, ts; ps = _ps, dvs = nothing)
+        wrap_array_vars(sys, ts; ps = _ps, dvs = nothing, inputs)
     else
-        wrap_array_vars(sys, ts; ps = _ps)
+        wrap_array_vars(sys, ts; ps = _ps, inputs)
     end
     # Need to keep old method of building the function since it uses `output_type`,
     # which can't be provided to `build_function`

src/systems/index_cache.jl

@@ -501,3 +501,33 @@ function reorder_parameters(ic::IndexCache, ps; drop_missing = false)
     end
     return result
 end
+
+# Given a parameter index, find the index of the buffer it is in when
+# `MTKParameters` is iterated
+function iterated_buffer_index(ic::IndexCache, ind::ParameterIndex)
+    idx = 0
+    if ind.portion isa SciMLStructures.Tunable
+        return idx + 1
+    elseif ic.tunable_buffer_size.length > 0
+        idx += 1
+    end
+    if ind.portion isa SciMLStructures.Discrete
+        return idx + length(first(ic.discrete_buffer_sizes)) * (ind.idx[1] - 1) + ind.idx[2]
+    elseif !isempty(ic.discrete_buffer_sizes)
+        idx += length(first(ic.discrete_buffer_sizes)) * length(ic.discrete_buffer_sizes)
+    end
+    if ind.portion isa SciMLStructures.Constants
+        return return idx + ind.idx[1]
+    elseif !isempty(ic.constant_buffer_sizes)
+        idx += length(ic.constant_buffer_sizes)
+    end
+    if ind.portion == DEPENDENT_PORTION
+        return idx + ind.idx[1]
+    elseif !isempty(ic.dependent_buffer_sizes)
+        idx += length(ic.dependent_buffer_sizes)
+    end
+    if ind.portion == NONNUMERIC_PORTION
+        return idx + ind.idx[1]
+    end
+    error("Unhandled portion $(ind.portion)")
+end