Unrecognized gradient using Zygote for AD with Universal Differential Equations

We’ve had this issue for over 2 weeks now (see the date of the previous posts in this discussion). When was this new Zygote issue introduced? I’m surprised it was not brought up during the previous lengthy discussion.

That was yesterday. Okay, I’ll mark this to take a look after Flux is all fixed up, though with the JuliaCon rush I am a bit behind :sweat_smile:

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Cheers Chris. I’ll keep investigating this. Meanwhile I hope @mcabbott or @darsnack can reproduce it with the new MWE and give some extra hints on what might be wrong :grinning_face_with_smiling_eyes: :pray: