trunk/7b4f739ae84d496739c2a73f8da95e8e829fd5cc: Fix forward AD gradcheck error indexing (#194991)
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Summary I reviewed the patch before submission and understand the change as a fix to the forward-AD fast-mode diagnostic path, not the normal gradcheck computation. The technical summary and test notes below were drafted with ChatGPT assistance and are quoted to keep that AI-assisted text clearly separated. Technical summary gradcheck(fast_mode=True, check_forward_ad=True) indexes fast-mode inputs among differentiab…
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