This repository is for Geometric Back-projection Network (GBNet) introduced in the following paper:
Geometric Back-projection Network for Point Cloud Classification
Shi Qiu, Saeed Anwar, Nick Barnes
IEEE Transactions on Multimedia (TMM), 2021

The paper can be downloaded from arXiv and IEEE early access.
If you find our paper/code is useful, please cite:

    @article{qiu2021geometric,
        title={Geometric Back-projection Network for Point Cloud Classification},
        author={Qiu, Shi and Anwar, Saeed and Barnes, Nick},
        journal={IEEE Transactions on Multimedia},
        year={2021},
        doi={10.1109/TMM.2021.3074240}
    }

• 23/04/2021 Codes for both ModelNet40 and ScanObjectNN are available now.
• 27/04/2021 Update model.py by adding class ABEM_Module(nn.Module).
• 29/04/2021 Pre-trained model (OA: 80.50%, mAcc: 77.31%) on ScanObjectNN is available at google drive.
• 30/04/2021 Update a pre-trained model (OA: 80.99%, mAcc: 78.21%) on ScanObjectNN via google drive.
• 03/05/2021 Pre-trained model (OA: 93.80%, mAcc: 91.04%) on ModelNet40 is available at google drive.

• Python 3.6
• Pytorch 0.4.0 with Cuda 9.1
• Higher Python/Pytorch/Cuda versions should also be compatible

Train the model:

• download ModelNet40, unzip and move modelnet40_ply_hdf5_2048 folder to ./data
• then run (more settings can be modified in main.py):

python main.py --exp_name=gbnet_modelnet40 --model=gbnet --dataset=modelnet40

Test the pre-trained model:

• put the pre-trained model under ./pretrained
• then run:

python main.py --exp_name=gbnet_modelnet40_eval --model=gbnet --dataset=modelnet40 --eval=True --model_path=pretrained/gbnet_modelnet40.t7

Train the model:

• download ScanObjectNN, and extract both training_objectdataset_augmentedrot_scale75.h5 and test_objectdataset_augmentedrot_scale75.h5 files to ./data
• then run (more settings can be modified in main.py):

python main.py --exp_name=gbnet_scanobjectnn --model=gbnet --dataset=ScanObjectNN

Test the pre-trained model:

• put the pre-trained model under ./pretrained
• then run:

python main.py --exp_name=gbnet_scanobjectnn_eval --model=gbnet --dataset=ScanObjectNN --eval=True --model_path=pretrained/gbnet_scanobjectnn.t7

• Python 3.6, Pytorch 0.4.0, Cuda 9.1
• 2 Nvidia P100 GPUs
• using default training settings as in main.py

For more discussions regarding the factors that may affect point cloud classification,
please refer to the following paper:
Revisiting Point Cloud Classification with a Simple and Effective Baseline

The code is built on DGCNN. We thank the authors for sharing the codes.