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It's fairly similar to a ROM patch in the video game space, which has mostly stood the test of time.

With a ROM, you could at least make a claim that it was your backup copy. I have no such claims to Facebook’s model.

Researchers unaffiliated with Facebook are allowed to possess and use the original weights though, and they can make use of these weights.

like that but requiring 60GBs of CPU RAM for some reason :-P

one has to wonder how did they implement the storage of those deltas to require that sort of RAM

For perspective, that's about $200-$250 of RAM on a desktop computer. They might just not have cared.

Though I expect somebody to write a patch to make this more accessible to people on laptops.