How to create submission file in Waymo dataset

[JerryPW]

Hi! Thanks for your great work!
Since your waymo mode wasn't released, instead, I used nuscence model to detect tthe waymo scene.
In the installation step, I can't create submission_3d_det.txtpb and submission_3d_mot.txtpb file, because the origin repository didn't make it very clear. Therefore, I wonder whether convinient for you to list the precise command for creating those needed files.
Looking forward for your reply.