fix: temporarily remove ambiguous adjoint

Author: AayushSabharwal

ext/SciMLBaseZygoteExt.jl

@@ -125,32 +125,6 @@ end
     VA[sym], ODESolution_getindex_pullback
 end
 
-@adjoint function Base.getindex(VA::ODESolution, sym, ::Colon)
-    function ODESolution_getindex_pullback(Δ)
-        i = symbolic_type(sym) != NotSymbolic() ? variable_index(VA, sym) : sym
-        if is_observed(VA, sym)
-            f = observed(VA, sym)
-            p = parameter_values(VA)
-            tunables, _, _ = SciMLStructures.canonicalize(SciMLStructures.Tunable(), p)
-            u = state_values(VA)
-            t = current_time(VA)
-            y, back = Zygote.pullback(u, tunables) do u, tunables
-                f.(u, Ref(tunables), t)
-            end
-            gs = back(Δ)
-            (gs[1], nothing)
-        elseif i === nothing
-            throw(error("Zygote AD of purely-symbolic slicing for observed quantities is not yet supported. Work around this by using `A[sym,i]` to access each element sequentially in the function being differentiated."))
-        else
-            @show i
-            Δ′ = [[i == k ? Δ[j] : zero(x[1]) for k in 1:length(x)]
-                  for (x, j) in zip(VA.u, 1:length(VA))]
-            (Δ′, nothing)
-        end
-    end
-    VA[sym, :], ODESolution_getindex_pullback
-end
-
 function obs_grads(VA, sym, obs_idx, Δ)
     y, back = Zygote.pullback(VA) do sol
         getindex.(Ref(sol), sym[obs_idx])
@@ -198,25 +172,6 @@ end
     VA[sym], ODESolution_getindex_pullback
 end
 
-@adjoint function Base.getindex(
-        VA::ODESolution{T}, sym::Union{Tuple, AbstractVector}, ::Colon) where {T}
-    function ODESolution_getindex_pullback(Δ)
-        sym = sym isa Tuple ? collect(sym) : sym
-        i = map(x -> symbolic_type(x) != NotSymbolic() ? variable_index(VA, x) : x, sym)
-
-        obs_idx = findall(s -> is_observed(VA, s), sym)
-        not_obs_idx = setdiff(1:length(sym), obs_idx)
-
-        gs_obs = obs_grads(VA, sym, isempty(obs_idx) ? nothing : obs_idx, Δ)
-        gs_not_obs = not_obs_grads(VA, sym, not_obs_idx, i, Δ)
-
-        a = Zygote.accum(gs_obs[1], gs_not_obs)
-
-        (a, nothing)
-    end
-    VA[sym], ODESolution_getindex_pullback
-end
-
 @adjoint function ODESolution{T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14
 }(u,
         args...) where {T1, T2, T3, T4, T5, T6, T7, T8,