target assign cost too much，and gpu util is low, how to improve it ?

[chenrui17]

how to improve target assignment operation when set batch_size = N like 15, class num = 6 or more bigger, function assign_target_single will be called 90 times , and it's inefficiently, and also i found gpu util is low when it run this code, and how to improve it ?

https://github.com/open-mmlab/OpenPCDet/blob/0642cf06d0fd84f50cc4c6c01ea28edbc72ea810/pcdet/models/dense_heads/target_assigner/atss_target_assigner.py#L47

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[github-actions[bot]]

This issue was closed because it has been inactive for 14 days since being marked as stale.