Make sensitivity interpolations type preserving

src/interpolation.jl

@@ -1,10 +1,26 @@
+function enable_interpolation_sensitivitymode end
+
+enable_interpolation_sensitivitymode(interp::Nothing) = nothing
+
+# Pass through should be deprecated in the future, made for backwards compat
+enable_interpolation_sensitivitymode(interp::AbstractDiffEqInterpolation) = interp
+
 """
 $(TYPEDEF)
 """
 struct HermiteInterpolation{T1, T2, T3} <: AbstractDiffEqInterpolation
     t::T1
     u::T2
     du::T3
+    sensitivitymode::Bool
+end
+
+function HermiteInterpolation(t,u,du; sensitivitymode=false)
+    HermiteInterpolation(t,u,du,sensitivitymode)
+end
+
+function enable_interpolation_sensitivitymode(interp::HermiteInterpolation)
+    HermiteInterpolation(interp.t,interp.u,interp.du,true)
 end
 
 """
@@ -13,6 +29,15 @@ $(TYPEDEF)
 struct LinearInterpolation{T1, T2} <: AbstractDiffEqInterpolation
     t::T1
     u::T2
+    sensitivitymode::Bool
+end
+
+function LinearInterpolation(t,u; sensitivitymode=false)
+    LinearInterpolation(t,u,sensitivitymode)
+end
+
+function enable_interpolation_sensitivitymode(interp::LinearInterpolation)
+    LinearInterpolation(interp.t,interp.u,true)
 end
 
 """
@@ -21,24 +46,22 @@ $(TYPEDEF)
 struct ConstantInterpolation{T1, T2} <: AbstractDiffEqInterpolation
     t::T1
     u::T2
+    sensitivitymode::Bool
 end
 
-"""
-$(TYPEDEF)
-"""
-struct SensitivityInterpolation{T1, T2} <: AbstractDiffEqInterpolation
-    t::T1
-    u::T2
+function ConstantInterpolation(t,u; sensitivitymode=false)
+    ConstantInterpolation(t,u,sensitivitymode)
+end
+
+function enable_interpolation_sensitivitymode(interp::ConstantInterpolation)
+    ConstantInterpolation(interp.t,interp.u,true)
 end
 
 interp_summary(::AbstractDiffEqInterpolation) = "Unknown"
 interp_summary(::HermiteInterpolation) = "3rd order Hermite"
 interp_summary(::LinearInterpolation) = "1st order linear"
 interp_summary(::ConstantInterpolation) = "Piecewise constant interpolation"
 interp_summary(::Nothing) = "No interpolation"
-function interp_summary(::SensitivityInterpolation)
-    "Interpolation disabled due to sensitivity analysis"
-end
 interp_summary(sol::AbstractSciMLSolution) = interp_summary(sol.interp)
 
 const SENSITIVITY_INTERP_MESSAGE = """
@@ -69,13 +92,6 @@ end
 function (id::ConstantInterpolation)(val, tvals, idxs, deriv, p, continuity::Symbol = :left)
     interpolation!(val, tvals, id, idxs, deriv, p, continuity)
 end
-function (id::SensitivityInterpolation)(tvals, idxs, deriv, p, continuity::Symbol = :left)
-    interpolation(tvals, id, idxs, deriv, p, continuity)
-end
-function (id::SensitivityInterpolation)(val, tvals, idxs, deriv, p,
-    continuity::Symbol = :left)
-    interpolation!(val, tvals, id, idxs, deriv, p, continuity)
-end
 
 @inline function interpolation(tvals, id::I, idxs, deriv::D, p,
     continuity::Symbol = :left) where {I, D}
@@ -118,7 +134,7 @@ end
                 vals[j] = u[k][idxs]
             end
         else
-            id isa SensitivityInterpolation && error(SENSITIVITY_INTERP_MESSAGE)
+            id.sensitivitymode && error(SENSITIVITY_INTERP_MESSAGE)
             dt = t[i] - t[i - 1]
             Θ = (tval - t[i - 1]) / dt
             idxs_internal = idxs
@@ -173,7 +189,7 @@ times t (sorted), with values u and derivatives ks
                 vals[j] = u[k][idxs]
             end
         else
-            id isa SensitivityInterpolation && error(SENSITIVITY_INTERP_MESSAGE)
+            id.sensitivitymode && error(SENSITIVITY_INTERP_MESSAGE)
             dt = t[i] - t[i - 1]
             Θ = (tval - t[i - 1]) / dt
             idxs_internal = idxs
@@ -232,7 +248,7 @@ times t (sorted), with values u and derivatives ks
             val = u[i - 1][idxs]
         end
     else
-        id isa SensitivityInterpolation && error(SENSITIVITY_INTERP_MESSAGE)
+        id.sensitivitymode && error(SENSITIVITY_INTERP_MESSAGE)
         dt = t[i] - t[i - 1]
         Θ = (tval - t[i - 1]) / dt
         idxs_internal = idxs
@@ -282,7 +298,7 @@ times t (sorted), with values u and derivatives ks
             copy!(out, u[i - 1][idxs])
         end
     else
-        id isa SensitivityInterpolation && error(SENSITIVITY_INTERP_MESSAGE)
+        id.sensitivitymode && error(SENSITIVITY_INTERP_MESSAGE)
         dt = t[i] - t[i - 1]
         Θ = (tval - t[i - 1]) / dt
         idxs_internal = idxs

src/solutions/ode_solutions.jl

@@ -396,13 +396,7 @@ function sensitivity_solution(sol::ODESolution, u, t)
         N = length((size(u0)..., length(u)))
     end
 
-    interp = if sol.interp isa LinearInterpolation
-        LinearInterpolation(t, u)
-    elseif sol.interp isa ConstantInterpolation
-        ConstantInterpolation(t, u)
-    else
-        SensitivityInterpolation(t, u)
-    end
+    interp = enable_interpolation_sensitivitymode(sol.interp)
 
     ODESolution{T, N}(u, sol.u_analytic, sol.errors, t,
         nothing, sol.prob,