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Neighbourhood-Insensitive Point Cloud Normal Estimation Network

Project Page | Paper | Video | Supp | Data | Pretrained Models

Zirui Wang and Victor Adrian Prisacariu. Active Vision Lab, University of Oxford. BMVC 2020 (Oral Presentation).

Update: We use our university's OneDrive to store our pretrained models and the preprocessed dataset. The university just changed the access policy and this stops us sharing our data through a public link so the data and pretrained links above are broken. The easiest fix for now is you can send your email address to ryan[AT]robots.ox.ac.uk and I'll share it through email. We will try to find out a way to share it with a link properly later.

Environment:

Python == 3.7
PyTorch >= 1.1.0
CUDA >= 9.0
h5py == 2.10

We tried PyTorch 1.1/1.3/1.4/1.5 and CUDA 9.0/9.2/10.0/10.1/10.2. So the code should be able to run as long as you have a modern PyTorch and CUDA installed.

Setup env:

conda create -n ninormal python=3.7
conda activate ninormal
conda install pytorch=1.1.0 torchvision cudatoolkit=9.0 -c pytorch  # you can change the pytorch and cuda version here.
conda install tqdm future
conda install -c anaconda scikit-learn
pip install h5py==2.10
pip install tensorflow  # this is the cpu version, we just need the tensorboard.

(Optional) Install open3d for visualisation. You might need a physical monitor to install this lib.

conda install -c open3d-admin open3d

Clone this repo:

git clone https://github.com/ActiveVisionLab/NINormal.git

Dataset:

We use the PCPNet dataset in our paper. The official PCPNet dataset is available at here. We pre-processed the official PCPNet dataset using scikit-learn's KDTree and wrapped the processed knn point patches in h5 files. For the best training efficiency, we produce an h5 file for each K and each train/test/eval split.

To simply reproduce our paper results with k=20 or k=50, we provide a subset of our full pre-processed dataset here.

To fully reproduce our results from k=3 to k=50 (paper Fig. 2), the full pre-processed dataset is available here.

Training

Untar the dataset.

tar -xvf path/to/the/tar.gz

We train all our models (except k=40 and k=50) using 3 Nvidia 1080Ti GPUs. For k=40 and k=50, we use 3 Nvidia Titan-RTX GPUs. All models are trained with batch size 6. To reproduce our paper results, set the --batchsize_train=6 and --batchsize_eval=6. Reduce the batch size when out of memory.

Train with 20 neighbours:

python train.py \
--datafolder='path/to/the/folder/contains/h5/files' \
--batchsize_train=6 \
--batchsize_eval=6

Train with 50 neighbours:

python train.py \
--datafolder='path/to/the/folder/contains/h5/files' \
--train_dataset_name='train_patchsize_2000_k_50.h5' \
--eval_dataset_name='eval_patchsize_2000_k_50.h5' \
--batchsize_train=6 \
--batchsize_eval=6

Optional: use a symlink

Alternatively, you can create a symlink that points to the downloaded dataset:

cd NINormal  # our repo
mkdir dataset_dir
cd dataset_dir
ln -s path/to/the/folder/contains/h5/files ./pcp_knn_patch_h5_files

and train with:

python train.py

Note on Batch Size

The batch size 6 is the batch size that the Conv2D() function processes. Our network can be implemented using the Conv1D() or Linear() but we use the 1x1 Conv2D() along with our pre-processed dataset to achieve the best balance between data loading and training. When setting the batch size to 6, the actual batch size our network processes is 6 x 2000 = 12000, as mentioned at the end of Sec. 3 in our paper. The number 2000 is the number of knn patches we packed in a subgroup in an h5 file. See the pre-processing script in ./utils and the PcpKnnPatchesDataset for more details.

Pretrained Models

Similar to the dataset, we provide a tar file that contains models trained with k=20 and k=50 here.

To evaluate all models that we present in Fig.2 (k=3 to k=50), download all models here.

Testing

Untar the downloaded checkpoints file.

tar -xvf path/to/the/ckpts/tar.gz

IMPORTANT NOTE: The k for trained checkpoints and the k for a dataset must match. E.g. Use the nb20 ckpt with the nb20 dataset:

python test.py \
--ckpt_path='/path/to/the/ckpts/nb_20' \
--test_dataset_name='test_patchsize_2000_k_20.h5'

Optional: use a symlink

Like the dataset, you can also do a symlink that points to the downloaded checkpoint folder:

cd NINormal  # our repo
ln -s path/to/the/folder/just/extracted ./paper_ckpts

and run test with just:

python test.py

Attention Weights Visualisation in 3D (paper Fig. 5)

We recommend visualising attention weights using k=50 (with the model trained with k=50 of course...) to see how our network pays extra attention to the boundary of a patch.

Install the opend3d lib. You might need a PC with a physical monitor to install this library...

conda install -c open3d-admin open3d

Similar to the testing procedure, after got datasets, run:

python test_vis_attn_map_3d.py --ckpt_path='/path/to/the/ckpts/nb_50'

ICP Iteration Experiment (paper Sec. 4.5)

We aim to release it soon.

Acknowledgement

The authors would like to thank Min Chen, Tengda Han, Shuda Li, Tim Yuqing Tang and Shangzhe Wu for insightful discussions and proofreading.

Citation

@inproceedings{wang2020ninormal,
    title={Neighbourhood-Insensitive Point Cloud Normal Estimation Network},
    author={Wang, Zirui and Prisacariu, Victor Adrian},
    booktitle={BMVC},
    year={2020}
}

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(BMVC 2020 Oral) Neighbourhood-Insensitive Point Cloud Normal Estimation Network

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