BEV encoding in MapTRv2 with r18 tiny models

[RemySun]

First things first, many thanks for making this code available !

When I try to make a r18 tiny config file for MapTRv2, I run into an issue with the BEV encoder.

I think the issue is that r18 tiny uses smaller BEV dimensions, so we change the GKT im2col_step. But there is not a direct equivalent as far as I can tell with bevpool.

How was this solved in the r18 experiments conducted in maptrv2?

[ztianlin]

same question here ^_^