Mattick says some world-model approaches are difficult to benchmark and reconstruct elements that are not ultimately used.

“they are hard to benchmark then there are other people who say well we actually do like reconstruction and they say well we actually reconstruct things which we don't actually end up using but all of these are still world models and I've also seen people like the the new dreamer paper which I don't know at what version they are well in fact they they pre-train a large video diffusion model on like all the data”