I am afraid that the current repo doesn't generate the winning solution of the ApolloScape 3D car Instance Understanding challenge. However, a very under-documented repo does have the winning solution code: https://github.com/stevenwudi/ApolloScape_InstanceSeg
Hope it helps
I would appreciate citation of the following paper if you find this repository helpful.
@InProceedings{Wu_2019_CVPR_Workshops,
author = {Wu, Di and Zhuang, Zhaoyong and Xiang, Canqun and Zou, Wenbin and Li, Xia},
title = {6D-VNet: End-To-End 6-DoF Vehicle Pose Estimation From Monocular RGB Images},
booktitle = {The IEEE Conference on Computer Vision and Pattern Recognition (CVPR) Workshops},
month = {June},
year = {2019}