Awesome

Generalized Few-Shot Point Cloud Segmentation Via Geometric Words

Created by Yating Xu from <a href="http://www.nus.edu.sg/" target="_blank">National University of Singapore</a>

Introduction

This repository contains the PyTorch implementation for our ICCV 2023 Paper "Generalized Few-Shot Point Cloud Segmentation Via Geometric Words" by Yating Xu, Conghui Hu, Na Zhao, Gim Hee Lee.

Installation

python 3.8
pytorch 1.8 with CUDA 11.1
tensorboard, h5py, transforms3d

Usage

Data preparation

S3DIS

Download S3DIS Dataset Version 1.2.
Copy pretrain/datasets/S3DIS/meta to ROOT_DIR/datasets/S3DIS/. Re-organize raw data into npy files by running
```
cd pretrain/preprocess
python collect_s3dis_data.py --data_path $path_to_S3DIS_raw_data --train
```
The generated numpy files are stored in ROOT_DIR/datasets/S3DIS/scenes/train_data.
To split rooms into blocks, run

python room2blocks.py --data_path ROOT_DIR/datasets/S3DIS/scenes/ --block_size 1 --stride 1 --train

One folder named blocks_bs1.0_s1.0 will be generated under ROOT_DIR/datasets/S3DIS/ by default.

To generate testing data, remove --train. Data folder for S3DIS is like follow:

-- S3DIS
    |-- scenes
        |-- train_data
        |-- test_data
    |-- meta
    |--blocks_bs1.0_s1.0
        |-- data (training block data)
        |--class2scans.pkl (will be generated by train.py)
        |-- ValSupp_S0_K5_Seed10 (support dataset. Will be generated by train.py)
            |-- mask (support point cloud label)
            |-- pcd (support point cloud)
    |--blocks_bs1.0_s1.0_test
        |--data
        |--clas2scans.pkl (will be generated by train.py)
        |--static_test_2048 (Query dataset. Will be generated by train.py)
            |-- label
            |-- pcd

ScanNet

Download ScanNet V2.
Copy pretrain/datasets/ScanNet/meta folder to ROOT_DIR/datasets/ScanNet/. Re-organize raw data into npy files by running
```
cd pretrain/preprocess
python collect_scannet_data.py --data_path $path_to_ScanNet_raw_data --train
```
The generated numpy files are stored in ROOT_DIR/datasets/ScanNet/scenes/train_data by default.
To split rooms into blocks, run

python room2blocks.py --data_path ROOT_DIR/datasets/ScanNet/scenes/ --dataset scannet --block_size 1 --stride 1 --train

One folder named blocks_bs1.0_s1.0 will be generated under ROOT_DIR/datasets/ScanNet/ by default.

Running

Training

Pre-training:

cd pretrain
bash pretrain_segmentor.sh

Change DATA_PATH accordingly.

Compute geometric words from base class data:

Example on S3DIS:

python get_basis.py --save_path log_s3dis/S0_K5 --pretrain_checkpoint_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/mpti/log_s3dis/log_pretrain_s3dis_S0_LongTail/ --cvfold 0 
--data_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/datasets/S3DIS/blocks_bs1.0_s1.0
 --num_cnt 150 --dataset s3dis

Change pretrain_checkpoint_path, data_path accordingly.

Example on ScanNet:

python get_basis.py --save_path log_scannet/S0_K5 --pretrain_checkpoint_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/mpti/log_scannet/log_pretrain_scannet_S0_LongTail/ 
--cvfold 0 --data_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/datasets/ScanNet/blocks_bs1.0_s1.0 
--num_cnt 180 --dataset scannet

Training on base class:

Example of 5-shot exp on S3DIS:

python train.py  --save_path log_s3dis/S0_K5/exp 
 --pc_augm  --dataset s3dis --k_shot 5 --phase train --cvfold 0  
 --basis_path log_s3dis/S0_K5/GlobalKmeans_EdgeConv123_cnt\=200_energy\=095_SVDReconstruct.pkl  
 --data_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/datasets/S3DIS/blocks_bs1.0_s1.0 
 --testing_data_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/datasets/S3DIS/blocks_bs1.0_s1.0_test  
 --use_pretrain_weight --pretrain_checkpoint_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/mpti/log_s3dis/log_pretrain_s3dis_S0_LongTail/ 
 --epochs 150 --energy 0.9 --total_classes 13 --eval_weight 1.

Example of 5-shot exp on ScanNet:

python train.py  --save_path log_scannet/S0_K5/exp 
 --pc_augm  --dataset scannet --k_shot 5 --phase train --cvfold 0  
 --basis_path log_scannet/S0_K5/GlobalKmeans_EdgeConv123_cnt\=180_energy\=095_SVDReconstruct.pkl  
 --data_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/datasets/ScanNet/blocks_bs1.0_s1.0
 --testing_data_path /home/yating/Documents/3d_segmentation/GFS_pcd_seg/datasets/ScanNet/blocks_bs1.0_s1.0_test  
 --use_pretrain_weight --pretrain_checkpoint_path /data/ytxu/GFS_pcd_seg/mpti/log_scannet/log_pretrain_scannet_S0_LongTail_Last6AsNovel/ 
 --epochs 150 --energy 0.95 --total_classes 21 --eval_weight 1.

Please change data_path, testing_data_path, pretrain_checkpoint_path accordingly.

Evaluation

Evaluation on 5-shot S3DIS:

Append following command to the training command.

 --only_evaluate --phase test --model_checkpoint_path log_s3dis/S0_K5/exp/train_epoch_xxx.pth
 --energy 0.9 --eval_weight 1.2

Evaluation on 5-shot ScanNet:

Append following command to the training command.

 --only_evaluate --phase test --model_checkpoint_path log_scannet/S0_K5/exp/train_epoch_xxx.pth
 --energy 0.95 --eval_weight 1.2

energy and eval_weight correspond to frequency limit in Alg.1 and beta in Eqn.6 of the paper, respectively.

Acknowledgement

We thank attMPTI and GFS-Seg for sharing their source code.