Finetune the model

[husamhamu]

Hey,
First thanks for this awesome work. I am trying to fine tune the kitti-model you guys provided. I figured how to do this and it is working great. But I also want to try to freeze the layers responsible for fine-tuning the orientation parameters. I think these are the model parameters rot_convs in the bbox_3d_head. Are there steps you can assist me with to do this?