My guess is that MidJourney has been doing a massive-scale reinforcement learning from human feedback (“RLHF”)—possibly the largest ever for text-to-image.
When human users choose to upscale an image, it’s because they prefer it over the alternatives. It’d be a huge waste not to use this as a reward signal—cheap to collect, and *exactly* aligned with what your user base wants.
The more users you have, the better RLHF you can do. And then the more users you gain.
— Jim Fan
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