Lai Qiangqiang comments

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                                            Lai Qiangqiang

ImportError: cannot import name 'ball_query_ext' from partially initialized module 'mmdet3d.ops.ball_query'

@whai362 Thanks for your awesome work. I also meet the problem. I install mmdetection3d following this official install tutorial [https://github.com/fundamentalvision/BEVFormer/blob/master/docs/install.md], mmcv-full = 1.4.0 , mmdet = 2.14.0 mmsegmentation = 0.14.1...

fix wrong type bug

you could try to install a older opencv version. for example, `pip3 install opencv-python==4.1.2.30` I solved this question by doing so.

The type name 'ReadOnly' does not exist in the type 'NativeArray<T>

i have solved this problem by change the git branch to lanelet2. enjoy!!!

关于如何扩展到下一个节点的坐标计算问题

dx和dy为小车坐标系，作者给了三个扩展数量，前进，左转，右转，三种扩展方式的路径长度是一样的。

关于如何扩展到下一个节点的坐标计算问题

> ``` > Node3D* Node3D::createSuccessor(const int i) { > float xSucc; > float ySucc; > float tSucc; > > // calculate successor p ositions forward > if (i < 3)...