pytorch

8887c950 - [inductor] Skip welford combine on first reduciton loop iteration (#121488)

[inductor] Skip welford combine on first reduciton loop iteration (#121488) On the first iteration we short circuit `welford_reduce` since we know the accumulators are filled with the default values. This is split out from #120330 to hopefully avoid the meta-internal failure. Pull Request resolved: https://github.com/pytorch/pytorch/pull/121488 Approved by: https://github.com/lezcano