Detach tensor in gen_candidates_scipy
to avoid test failure due to new warning
#2797
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Summary:
pytorch/pytorch#143261 added a new warning to pytorch that gets raised when converting a tensor with gradients to a scalar without detaching it first.
This caused some test failues in botorch (which are likely a bit overzealous, but we can fix that separately). This makes a change in
gen_candidates_scipy
to fix this.There are most likely other occurrences of this in botorch that we should fix, but here I'm quickly addressing the test failures first.
Reviewed By: saitcakmak
Differential Revision: D72286925