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DY-ATL avatar DY-ATL commented on May 20, 2024 1

Thank you for your answer!

from croco.

PhilippeWeinzaepfel avatar PhilippeWeinzaepfel commented on May 20, 2024

Hi,

For pre-training, we indeed use 256x256 images (both for habitat and real image pairs) from which we extract 224x224 crops.

What we find the most important for downstream tasks is to both train and test at the same resolution, even if different from pre-training. This is why we use a tiling-based approach for stereo/flow at test time. While relative positional embedding helps, it is not enough to generalize to any resolution at test time.

Overall, specially once real image pairs are included, the pre-training should be effective irrespectively of the focals or resolution of the downstream tasks. Pre-training at higher resolution is likely to be better but it would be slow( DINOv2 actually did pre-train first at 224x224 before doing a second step at larger resolution, and a similar strategy could be used there if needed).

Best
Philippe

from croco.

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