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CLIP2Scene: Towards Label-efficient 3D Scene Understanding by CLIP (CVPR 2023)

Overview of the method CLIP2Scene leverages CLIP knowledge to pre-train a 3D point cloud segmentation network via semantic and spatial-temporal consistency regularization. It yields impressive performance on annotation-free 3D semantic segmentation and significantly outperforms other self-supervised methods when fine-tuning on annotated data.

[CVPR 2023 Paper]

Installation

Step 1. Install PyTorch and Torchvision following official instructions,

conda install pytorch==1.10.0 torchvision==0.11.0 cudatoolkit=11.3 -c pytorch -c conda-forge

Step 2. Install Torchsparse and MinkowskiEngine.

# MinkowskiEngine
conda install openblas-devel -c anaconda
git clone https://github.com/NVIDIA/MinkowskiEngine.git
cd MinkowskiEngine
pip install ninja
python setup.py install --blas_include_dirs=${CONDA_PREFIX}/include --blas=openblas

# Torchsparse
# refer to https://github.com/PJLab-ADG/PCSeg/blob/master/docs/INSTALL.md
# Make a directory named `torchsparse_dir`
cd package/
mkdir torchsparse_dir/
#Unzip the `.zip` files in `package/`
unzip sparsehash.zip
unzip torchsparse.zip
mv sparsehash-master/ sparsehash/
cd sparsehash/
./configure --prefix=/${ROOT}/package/torchsparse_dir/sphash/
make
make install
#Compile `torchsparse`
cd ..
pip install ./torchsparse

Step 3. Install CLIP, MaskCLIP, Pytorch_lightning, Nuscenes devkit.

# Install CLIP (https://github.com/openai/CLIP)
pip install ftfy regex tqdm
pip install git+https://github.com/openai/CLIP.git
# Install MaskCLIP (https://github.com/chongzhou96/MaskCLIP)
pip install -U openmim
mim install mmcv-full==1.4.0
git clone https://github.com/chongzhou96/MaskCLIP.git
cd MaskCLIP
pip install -v -e .
# Install Pytorch_lightning 
pip install pytorch_lightning==1.4.0
# Install Nuscenes devkit 
pip install torchmetrics==0.4.0
pip install nuscenes-devkit==1.1.9
# Note that we should manually add the following function to the class "LidarPointCloud" 
# in "miniconda3/envs/{your environment name}/lib/python{your python version}/site-packages/nuscenes/utils/data_classes.py"
class LidarPointCloud(PointCloud):
    @classmethod
    def from_points(cls, points) -> 'LidarPointCloud':
        return cls(points.T)

Data Preparation

In this paper, we conduct experiments on ScanNet, Nuscenes, and SemanticKITTI.

Step 1. Download the ScanNet, NuScenes and SemanticKITTI dataset.

# Pre-processing the scannet dataset
python utils/preprocess_scannet.py
# Obtain nuScenes's sweeps information in (https://github.com/open-mmlab/OpenPCDet/blob/master/docs/GETTING_STARTED.md), and
# save as "nuscenes_infos_dict_10sweeps_train.pkl"
python -m pcdet.datasets.nuscenes.nuscenes_dataset --func create_nuscenes_infos \
    --cfg_file tools/cfgs/dataset_configs/nuscenes_dataset.yaml \
    --version v1.0-trainva

Step 2. Download and convert the CLIP models,

python utils/convert_clip_weights.py --model ViT16 --backbone
python utils/convert_clip_weights.py --model ViT16
# obtain ViT16_clip_backbone.pth and ViT16_clip_weights.pth

Step 3. Prepare the CLIP's text embeddings of the scannet and nuscenes datasets,

python utils/prompt_engineering.py --model ViT16 --class-set nuscenes
python utils/prompt_engineering.py --model ViT16 --class-set scannet

Pre-training

ScanNet.

python pretrain.py --cfg_file config/clip2scene_scannet_pretrain.yaml
# The pre-trained model will be saved in /output/clip2scene/scannet/{date}/model.pt

NuScenes.

python pretrain.py --cfg_file config/clip2scene_nuscenes_pretrain.yaml
# The pre-trained model will be saved in /output/clip2scene/nuscenes/{date}/model.pt

Annotation-free

ScanNet.

python downstream.py --cfg_file config/clip2scene_scannet_label_free.yaml --pretraining_path output/clip2scene/scannet/{date}/model.pt

NuScenes.

python downstream.py --cfg_file config/clip2scene_nuscenes_label_free.yaml --pretraining_path output/clip2scene/nuscenes/{date}/model.pt

Fine-tuning on labeled data

ScanNet.

python downstream.py --cfg_file config/clip2scene_scannet_finetune.yaml --pretraining_path output/clip2scene/scannet/{date}/model.pt
# The fine-tuned model will be saved in /output/downstream/scannet/{date}/model.pt

NuScenes.

python downstream.py --cfg_file config/clip2scene_nuscenes_finetune.yaml --pretraining_path output/clip2scene/nuscenes/{date}/model.pt
# The fine-tuned model will be saved in /output/downstream/nuscenes/{date}/model.pt

SemanticKITTI.

python downstream.py --cfg_file config/clip2scene_kitti_finetune.yaml --pretraining_path output/clip2scene/nuscenes/{date}/model.pt
# The fine-tuned model will be saved in /output/downstream/kitti/{date}/model.pt

Citation

If you use CLIP2Scene in your work, please cite

@inproceedings{chen2023clip2scene,
  title={CLIP2Scene: Towards Label-efficient 3D Scene Understanding by CLIP},
  author={Chen, Runnan and Liu, Youquan and Kong, Lingdong and Zhu, Xinge and Ma, Yuexin and Li, Yikang and Hou, Yuenan and Qiao, Yu and Wang, Wenping},
  booktitle={Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition},
  pages={7020--7030},
  year={2023}
}

Acknowledgement.

Part of the codebase has been adapted from SLidR, MaskCLIP, PCSeg and OpenPCDet.

Contact

For questions about our paper or code, please contact Runnan Chen.