Cam4DOcc

The official code an data for the benchmark with baselines for our paper: Cam4DOcc: Benchmark for Camera-Only 4D Occupancy Forecasting in Autonomous Driving Applications

This work has been accepted by CVPR 2024 🎉

Junyi Ma#, Xieyuanli Chen#, Jiawei Huang, Jingyi Xu, Zhen Luo, Jintao Xu, Weihao Gu, Rui Ai, Hesheng Wang*

Citation

If you use Cam4DOcc in an academic work, please cite our paper:

@inproceedings{ma2024cvpr,
	author = {Junyi Ma and Xieyuanli Chen and Jiawei Huang and Jingyi Xu and Zhen Luo and Jintao Xu and Weihao Gu and Rui Ai and Hesheng Wang},
	title = {{Cam4DOcc: Benchmark for Camera-Only 4D Occupancy Forecasting in Autonomous Driving Applications}},
	booktitle = {Proc.~of the IEEE/CVF Conf.~on Computer Vision and Pattern Recognition (CVPR)},
	year = 2024
}

Installation

We follow the installation instructions of our codebase OpenOccupancy, which are also posted here

• Create a conda virtual environment and activate it

conda create -n cam4docc python=3.7 -y
conda activate cam4docc

• Install PyTorch and torchvision (tested on torch==1.10.1 & cuda=11.3)

conda install pytorch==1.10.1 torchvision==0.11.2 torchaudio==0.10.1 cudatoolkit=11.3 -c pytorch -c conda-forge

• Install gcc>=5 in conda env

conda install -c omgarcia gcc-6

• Install mmcv, mmdet, and mmseg

pip install mmcv-full==1.4.0
pip install mmdet==2.14.0
pip install mmsegmentation==0.14.1

• Install mmdet3d from the source code

git clone https://github.com/open-mmlab/mmdetection3d.git
cd mmdetection3d
git checkout v0.17.1 # Other versions may not be compatible.
python setup.py install

• Install other dependencies

pip install timm
pip install open3d-python
pip install PyMCubes
pip install spconv-cu113
pip install fvcore
pip install setuptools==59.5.0

pip install lyft_dataset_sdk # for lyft dataset

• Install occupancy pooling

git clone git@github.com:haomo-ai/Cam4DOcc.git
cd Cam4DOcc
export PYTHONPATH=“.”
python setup.py develop

Data Structure

nuScenes dataset

• Please link your nuScenes V1.0 full dataset to the data folder.
• nuScenes-Occupancy, nuscenes_occ_infos_train.pkl, and nuscenes_occ_infos_val.pkl are also provided by the previous work. If you only want to reproduce the forecasting results with "inflated" form, nuScenes dataset and Cam4DOcc are all you need.

Lyft dataset

• Please link your Lyft dataset to the data folder.
• The required folders are listed below.

Note that the folders under cam4docc will be generated automatically once you first run our training or evaluation scripts.

Cam4DOcc
├── data/
│   ├── nuscenes/
│   │   ├── maps/
│   │   ├── samples/
│   │   ├── sweeps/
│   │   ├── lidarseg/
│   │   ├── v1.0-test/
│   │   ├── v1.0-trainval/
│   │   ├── nuscenes_occ_infos_train.pkl
│   │   ├── nuscenes_occ_infos_val.pkl
│   ├── nuScenes-Occupancy/
│   ├── lyft/
│   │   ├── maps/
│   │   ├── train_data/
│   │   ├── images/   # from train images, containing xxx.jpeg
│   ├── cam4docc
│   │   ├── GMO/
│   │   │   ├── segmentation/
│   │   │   ├── instance/
│   │   │   ├── flow/
│   │   ├── MMO/
│   │   │   ├── segmentation/
│   │   │   ├── instance/
│   │   │   ├── flow/
│   │   ├── GMO_lyft/
│   │   │   ├── ...
│   │   ├── MMO_lyft/
│   │   │   ├── ...

Alternatively, you could manually modify the path parameters in the config files instead of using the default data structure, which are also listed here:

occ_path = "./data/nuScenes-Occupancy"
depth_gt_path = './data/depth_gt'
train_ann_file = "./data/nuscenes/nuscenes_occ_infos_train.pkl"
val_ann_file = "./data/nuscenes/nuscenes_occ_infos_val.pkl"
cam4docc_dataset_path = "./data/cam4docc/"
nusc_root = './data/nuscenes/'

Training and Evaluation

We directly integrate the Cam4DOcc dataset generation pipeline into the dataloader, so you can directly run training or evaluate scripts and just wait 😏

Optionally, you can set only_generate_dataset=True in the config files to only generate the Cam4DOcc data without model training and inference.

Train OCFNetV1.1 with 8 GPUs

OCFNetV1.1 can forecast inflated GMO and others. In this case, vehicle and human are considered as one unified category.

For the nuScenes dataset, please run

bash run.sh ./projects/configs/baselines/OCFNet_in_Cam4DOcc_V1.1.py 8

For the Lyft dataset, please run

bash run.sh ./projects/configs/baselines/OCFNet_in_Cam4DOcc_V1.1_lyft.py 8

Train OCFNetV1.2 with 8 GPUs

OCFNetV1.2 can forecast inflated GMO including bicycle, bus, car, construction, motorcycle, trailer, truck, pedestrian, and others. In this case, vehicle and human are divided into multiple categories for clearer evaluation on forecasting performance.

For the nuScenes dataset, please run

bash run.sh ./projects/configs/baselines/OCFNet_in_Cam4DOcc_V1.2.py 8

For the Lyft dataset, please run

bash run.sh ./projects/configs/baselines/OCFNet_in_Cam4DOcc_V1.2_lyft.py 8

• The training/test process will be accelerated several times after you generate datasets by the first epoch.

Test OCFNet for different tasks

If you only want to test the performance of occupancy prediction for the present frame (current observation), please set test_present=True in the config files. Otherwise, forecasting performance on the future interval is evaluated.

bash run_eval.sh $PATH_TO_CFG $PATH_TO_CKPT $GPU_NUM
# e.g. bash run_eval.sh ./projects/configs/baselines/OCFNet_in_Cam4DOcc_V1.1.py ./work_dirs/OCFNet_in_Cam4DOcc_V1.1/epoch_20.pth  8

Please set save_pred and save_path in the config files once saving prediction results is needed.

VPQ evaluation of 3D instance prediction will be refined in the future.

Visualization

Please install the dependencies as follows:

sudo apt-get install Xvfb
pip install xvfbwrapper
pip install mayavi

where Xvfb may be needed for visualization in your server.

Visualize ground-truth occupancy labels. Set show_time_change = True if you want to show the changing state of occupancy in time intervals.

cd viz
python viz_gt.py

Visualize occupancy forecasting results. Set show_time_change = True if you want to show the changing state of occupancy in time intervals.

cd viz
python viz_pred.py

There is still room for improvement. Camera-only 4D occupancy forecasting remains challenging, especially for predicting over longer time intervals with many moving objects. We envision this benchmark as a valuable evaluation tool, and our OCFNet can serve as a foundational codebase for future research on 4D occupancy forecasting.

Basic Information

Some basic information as well as key parameters for our current version.

Type	Info	Parameter
train	23,930 sequences	train_capacity
val	5,119 frames	test_capacity
voxel size	0.2m	voxel_x/y/z
range	[-51.2m, -51.2m, -5m, 51.2m, 51.2m, 3m]	point_cloud_range
volume size	[512, 512, 40]	occ_size
classes	2 for V1.1 / 9 for V1.2	num_cls
observation frames	3	time_receptive_field
future frames	4	n_future_frames
extension frames	6	n_future_frames_plus

Our proposed OCFNet can still perform well while being trained with partial data. Please try to decrease train_capacity if you want to explore more details with sparser supervision signals.

In addition, please make sure that n_future_frames_plus <= time_receptive_field + n_future_frames because n_future_frames_plus means the real prediction number. We estimate more frames including the past ones rather than only n_future_frames.

Pretrained Models

We will provide our pretrained models of the erratum version. Your patience is appreciated.

Deprecated:

Please download our pretrained models (for epoch=20) to resume training or reproduce results.

Version	Google Drive	Baidu Cloud	Config
V1.0	link	link	only vehicle
V1.1	link	link	OCFNet_in_Cam4DOcc_V1.1.py
V1.2	link	link	OCFNet_in_Cam4DOcc_V1.2.py

Other Baselines

We also provide the evaluation on the forecasting performance of other baselines in Cam4DOcc.

TODO

The tutorial is being updated ...

We will release our pretrained models as soon as possible. OCFNetV1.3 and OCFNetV2 are on their way ...

Acknowledgement

We thank the fantastic works OpenOccupancy, PowerBEV, and FIERY for their pioneer code release, which provide codebase for this benchmark.