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<div align="center"> <img src="./figure/snake.png" width = "200" align=center /> </div> <div align="center"> <h1>Point Mamba</h1> <h3>A Novel Point Cloud Backbone Based on State Space Model with Octree-Based Ordering Strategy</h3>

Overview

Citation

If you find this project useful for your work, please consider citing:

@misc{liu2024point,
     title={Point Mamba: A Novel Point Cloud Backbone Based on State Space Model with Octree-Based Ordering Strategy}, 
     author={Jiuming Liu and Ruiji Yu and Yian Wang and Yu Zheng and Tianchen Deng and Weicai Ye and Hesheng Wang},
     year={2024},
     eprint={2403.06467},
     archivePrefix={arXiv},
     primaryClass={cs.CV}
}

News

2024/3/11 Release our code and checkpoint for semantic segmentation on Scannet!

1. Environment

The code has been tested on Ubuntu 20.04 with 3 Nvidia 4090 GPUs (24GB memory).

Python 3.10.13

conda create -n your_env_name python=3.10.13

Install torch 2.1.1 + cu118

pip install torch==2.1.1 torchvision==0.16.1 torchaudio==2.1.1 --index-url https://download.pytorch.org/whl/cu118

Clone this repository and install the requirements.
```
pip install -r requirements.txt
```

Install the library for octree-based depthwise convolution.

git clone https://github.com/octree-nn/dwconv.git
pip install ./dwconv

Install causal-conv1d and mamba, which you can download in this link.
```
pip install -e causal-conv1d
pip install -e mamba
```

2. ScanNet Segmentation

Data: Download the data from the ScanNet benchmark. Unzip the data and place it to the folder <scannet_folder>. Run the following command to prepare the dataset.

python tools/seg_scannet.py --run process_scannet --path_in scannet

The filelist should be like this:


├── scannet
│ ├── scans
│ │ ├── [scene_id]
│ │ │ ├── [scene_id].aggregation.json
│ │ │ ├── [scene_id].txt
│ │ │ ├── [scene_id]_vh_clean.aggregation.json
│ │ │ ├── [scene_id]_vh_clean.segs.json
│ │ │ ├── [scene_id]_vh_clean_2.0.010000.segs.json
│ │ │ ├── [scene_id]_vh_clean_2.labels.ply
│ │ │ ├── [scene_id]_vh_clean_2.ply
│ ├── scans_test
│ │ ├── [scene_id]
│ │ │ ├── [scene_id].aggregation.json
│ │ │ ├── [scene_id].txt
│ │ │ ├── [scene_id]_vh_clean.aggregation.json
│ │ │ ├── [scene_id]_vh_clean.segs.json
│ │ │ ├── [scene_id]_vh_clean_2.0.010000.segs.json
│ │ │ ├── [scene_id]_vh_clean_2.ply
│ ├── scannetv2-labels.combined.tsv

Train: Run the following command to train the network with 3 GPUs and port 10001. The mIoU on the validation set without voting is 75.0. And the training log and weights can be download in link
```
python scripts/run_seg_scannet.py --gpu 0,1,2 --alias scannet --port 10001
```
Evaluate: Run the following command to get the per-point predictions for the validation dataset with a voting strategy. And after voting, the mIoU is 75.7 on the validation dataset.
```
python scripts/run_seg_scannet.py --gpu 0 --alias scannet --run validate
```

3. ModelNet40 Classification (Point Mamba(O))

Data: Run the following command to prepare the dataset.
```
python tools/cls_modelnet.py
```
Train: Run the following command to train the network with 1 GPU. The classification accuracy on the testing set without voting is 92.7%. The code for Point Mamba(C) will be released in another branch later. Checkpoints will be released later.
```
python classification.py --config configs/cls_m40.yaml SOLVER.gpu 0,
```

4. Acknowledgement

Our project is based on

Mamba (paper, code)
Octformer(paper, code)
Vision Mamba(paper,code)
Point Cloud Transformer(paper, code)

Thanks for their wonderful works!