chore: add CRC to extentions

Author: DhairyaLGandhi

Project.toml

@@ -57,10 +57,12 @@ Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 
 [weakdeps]
 BifurcationKit = "0f109fa4-8a5d-4b75-95aa-f515264e7665"
+ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
 DeepDiffs = "ab62b9b5-e342-54a8-a765-a90f495de1a6"
 
 [extensions]
 MTKBifurcationKitExt = "BifurcationKit"
+MTKChainRulesCoreExt = "ChainRulesCore"
 MTKDeepDiffsExt = "DeepDiffs"
 
 [compat]

ext/MTKChainRulesCoreExt.jl

@@ -0,0 +1,13 @@
+module MTKChainRulesCoreExt
+
+import ModelingToolkit as MTK
+import ChainRulesCore
+
+function ChainRulesCore.rrule(::Type{MTK.MTKParameters}, tunables, args...)
+    function mtp_pullback(dt)
+        (NoTangent(), dt.tunable[1:length(tunables)], ntuple(_ -> NoTangent(), length(args))...)
+    end
+    MTK.MTKParameters(tunables, args...), mtp_pullback
+end
+
+end