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Even if you disclaim configuration errors or updates (despite this accounting for most of a system's operating lifespan, and human/configuration errors accounting for a large fraction of all major errors at cloud providers etc according to postmortems), an error may still happen too fast to notice. Recall that in the preference learning case, the bug manifested after Christiano et al went to sleep, and they woke up to the maximally-NSFW AI. AlphaZero trained in ~2 hours wallclock, IIRC. Someone working on an even larger cluster commits a change and takes a quick bathroom break...