Support PointTransformer V2 支持 PointTransformer V2算法

[OpenMMLab-Assistant-004]

Support PointTransformer V2

支持 PointTransformer V2算法

Point Transformer V2 is a powerful and efficient Transformer-based backbone network for 3D point cloud understanding, for point cloud classification and semantic segmentation tasks.

• Performance SOTA open source code reference](https://github.com/Pointcept/Pointcept))

We need to implement a version of SOTA within 24 G of the training memory

Point Transformer V2 是一种用于 3D 点云理解的功能强大且高效
的基于 Transformer 的骨干网络，在点云分类、语义分割任务上

• 表现SOTA开源代码参考](https://github.com/Pointcept/Pointcept))
  我们需要实现训练显存在 24 G 以内的版本

Task Information

Repository：MMDetection3D

Difficulty：Hard

Points：50

Estimated Time Consumption：28 days

Task Status

Claimant's Github ID：None

Claim Time：None

PR Link：None

Points to Note

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