SparseOcc v1.1 release

SparseOcc v1.1 release (#37)

* add usage of ray_metrics.py

* topk bug fix

* add scal and lovasz loss

* add focal loss

* add bda flip rot

* code clean

* add config for 60ep

* update panoptic config

* Cleaning

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Co-authored-by: YANG-CY-163 <[email protected]>

SparseOcc v1.0 release

Code and weights to reproduce the results