How to generate the occ flow?

[TabGuigui]

Dear all,

Thank you for building the openscene bmk for further research in autonomous driving.

Compared to other benchmarks, openscene includes occupancy flow annotation. The existing works such as FIERY, Uniad use the box annotation to compute bev annotation for one vehicle and calculate the flow between two adjacent frames. While this is a solution to create occ flow annotation, It is too coarse since the grid in one vehicle is totally the same.

I wonder if is there any difference in flow annotation in openscene benchmark and if so, could you share?

Thank you.

[ndm-wangfeng]

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