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Meta Batch-Instance Normalization for Generalizable Person Re-Identification (MetaBIN), [CVPR 2021]

<Illustration of unsuccessful generalization scenarios and our framework>

• (a) Under-style-normalization happens when the trained BN model fails to distinguish identities on unseen domains.
• (b) Over-style-normalization happens when the trained IN model removes even ID-discriminative information.
• (c) Our key idea is to generalize BIN layers by simulating the preceding cases in a meta-learning pipeline. By overcoming the harsh situations, our model learns to avoid overfitting to source styles.

MetaBIN

git clone our_repository

1) Prerequisites

• Ubuntu 18.04
• Python 3.6
• Pytorch 1.7+
• NVIDIA GPU (>=8,000MiB)
• Anaconda 4.8.3
• CUDA 10.1 (optional)
• Recent GPU driver (Need to support AMP [link])

2) Preparation

conda create -n MetaBIN python=3.6
conda activate MetaBIN
conda install pytorch==1.7.0 torchvision==0.8.0 torchaudio==0.7.0 cudatoolkit=10.1 -c pytorch
pip install tensorboard
pip install Cython
pip install yacs
pip install termcolor
pip install tabulate
pip install scikit-learn

pip install h5py
pip install imageio
pip install openpyxl 
pip install matplotlib 
pip install pandas 
pip install seaborn

3) Test only

• Download our model [link] to MetaBIN/logs/Sample/DG-mobilenet

├── MetaBIN/logs/Sample/DG-mobilenet
│   ├── last_checkpoint
│   ├── model_0099999.pth
│   ├── result.png

• Download test datasets [link] to MetaBIN/datasets/

├── MetaBIN/datasets
│   ├── GRID
│   ├── prid_2011
│   ├── QMUL-iLIDS
│   ├── viper

• Execute run_file cd MetaBIN/ sh run_evaluate.sh

• you can get the following results

• Other models [link]

Advanced (train new models)

4) Check the below repository structure

MetaBIN/
├── configs/
├── datasets/ (*need to download and connect it by symbolic link [check section 4], please check the folder name*)
│   ├── *cuhk02
│   ├── *cuhk03
│   ├── *CUHK-SYSU
│   ├── *DukeMTMC-reID
│   ├── *GRID
│   ├── *Market-1501-v15.09.15
│   ├── *prid_2011
│   ├── *QMUL-iLIDS
│   ├── *viper
├── demo/
├── fastreid/
├── logs/ 
├── pretrained/ 
├── tests/
├── tools/
'*' means symbolic links which you make (check below sections) 

5) download dataset and connect it

• Download dataset

  • For single-source DG
    • Need to download Market1501, DukeMTMC-REID [check section 8-1,2]
  • For multi-source DG
    • Training: Market1501, DukeMTMC-REID, CUHK02, CUHK03, CUHK-SYSU [check section 8-1,2,3,4,5]
    • Testing: GRID, PRID, QMUL i-LIDS, VIPer [check section 8-6,7,8,9]

• Symbolic link (recommended)

  • Check symbolic_link_dataset.sh
  • Modify each directory (need to change)
  • cd MetaBIN
  • bash symbolic_link_dataset.sh

• Direct connect (not recommended)

  • If you don't want to make symbolic link, move each dataset folder into ./datasets/
  • Check the folder name for each dataset

6) Create pretrained and logs folder

• Symbolic link (recommended)
  • Make 'MetaBIN(logs)' and 'MetaBIN(pretrained)' folder outside MetaBIN

├── MetaBIN
│   ├── configs/
│   ├── ....
│   ├── tools/
├── MetaBIN(logs)
├── MetaBIN(pretrained)

• cd MetaBIN

• bash symbolic_link_others.sh

• Download pretrained models and change name

  • mobilenetv2_x1_0: [link]
  • mobilenetv2_x1_4: [link]
  • change name as mobilenetv2_1.0.pth, mobilenetv2_1.4.pth

• Or download pretrained models [link]

• Direct connect (not recommended)

  • Make 'pretrained' and 'logs' folder in MetaBIN
  • Move the pretrained models to pretrained

7) Train

• If you run code in pycharm

  • tools/train_net.py -> Edit congifuration
  • Working directory: your folders/MetaBIN/
  • Parameters: --config-file ./configs/Sample/DG-mobilenet.yml

• Single GPU

python3 ./tools/train_net.py --config-file ./configs/Sample/DG-mobilenet.yml

• Single GPU (specific GPU)

python3 ./tools/train_net.py --config-file ./configs/Sample/DG-mobilenet.yml MODEL.DEVICE "cuda:0"

• Resume (model weights is automatically loaded based on last_checkpoint file in logs)

python3 ./tools/train_net.py --config-file ./configs/Sample/DG-mobilenet.yml --resume

• Evaluation only

python3 ./tools/train_net.py --config-file ./configs/Sample/DG-mobilenet.yml --eval-only

8) Datasets

• (1) Market1501

  • Create a directory named Market-1501-v15.09.15
  • Download the dataset to Market-1501-v15.09.15 from link and extract the files.
  • The data structure should look like

  Market-1501-v15.09.15/
  ├── bounding_box_test/
  ├── bounding_box_train/
  ├── gt_bbox/
  ├── gt_query/
  ├── query/
  

• (2) DukeMTMC-reID

  • Create a directory called DukeMTMC-reID
  • Download DukeMTMC-reID from link and extract the files.
  • The data structure should look like

  DukeMTMC-reID/
  ├── bounding_box_test/
  ├── bounding_box_train/
  ├── query/
  

• (3) CUHK02

  • Create cuhk02 folder
  • Download the data from link and put it under cuhk02.
    • The data structure should look like

  cuhk02/
  ├── P1/
  ├── P2/
  ├── P3/
  ├── P4/
  ├── P5/
  

• (4) CUHK03

  • Create cuhk03 folder
  • Download dataset to cuhk03 from link and extract “cuhk03_release.zip”, resulting in “cuhk03/cuhk03_release/”.
  • Download the new split (767/700) from person-re-ranking. What you need are “cuhk03_new_protocol_config_detected.mat” and “cuhk03_new_protocol_config_labeled.mat”. Put these two mat files under cuhk03.
  • The data structure should look like

  cuhk03/
  ├── cuhk03_release/
  ├── cuhk03_new_protocol_config_detected.mat
  ├── cuhk03_new_protocol_config_labeled.mat
  

• (5) Person Search (CUHK-SYSU)

  • Create a directory called CUHK-SYSU
  • Download CUHK-SYSU from link and extract the files.
  • Cropped images can be created by my matlab code make_cropped_image.m (this code is included in the datasets folder)
  • The data structure should look like

  CUHK-SYSU/
  ├── annotation/
  ├── Image/
  ├── cropped_image/
  ├── make_cropped_image.m (my matlab code)
  

• (6) GRID

  • Create a directory called GRID
  • Download GRID from link and extract the files.
  • Split sets (splits.json) can be created by python code grid.py
  • The data structure should look like

  GRID/
  ├── gallery/
  ├── probe/
  ├── splits_single_shot.json (This will be created by `grid.py` in `fastreid/data/datasets/` folder)
  

• (7) PRID

  • Create a directory called prid_2011
  • Download prid_2011 from link and extract the files.
  • Split sets (splits_single_shot.json) can be created by python code prid.py
  • The data structure should look like

  prid_2011/
  ├── single_shot/
  ├── multi_shot/
  ├── splits_single_shot.json (This will be created by `prid.py` in `fastreid/data/datasets/` folder)
  

• (8) QMUL i-LIDS

  • http://www.eecs.qmul.ac.uk/~jason/data/i-LIDS_Pedestrian.tgz
  • https://github.com/BJTUJia/person_reID_DualNorm
  • Create a directory called QMUL_iLIDS
  • Download QMUL_iLIDS from the upper links
  • Split sets can be created by python code iLIDS.py
  • The data structure should look like

  QMUL-iLIDS/
  ├── images/
  ├── splits.json (This will be created by `iLIDS.py` in `fastreid/data/datasets/` folder)
  

• (9) VIPer

  • Create a directory called viper
  • Download viper from link and extract the files.
  • Split sets can be created by my matlab code make_split.m (this code is included in the datasets folder)
  • The data structure should look like

  viper/
  ├── cam_a/
  ├── cam_b/
  ├── make_split.m (my matlab code)
  ├── split_1a # Train: split1, Test: split2 ([query]cam1->[gallery]cam2)
  ├── split_1b # Train: split2, Test: split1 (cam1->cam2)
  ├── split_1c # Train: split1, Test: split2 (cam2->cam1)
  ├── split_1d # Train: split2, Test: split1 (cam2->cam1)
  ...
  ...
  ├── split_10a
  ├── split_10b
  ├── split_10c
  ├── split_10d
  

9) Code structure

• Our code is based on fastreid link

• fastreid/config/defaults.py: default settings (parameters)

• fastreid/data/datasets/: about datasets

• tools/train_net.py: Main code (train/test/tsne/visualize)

• fastreid/engine/defaults.py: build dataset, build model

  • fastreid/data/build.py: build datasets (base model/meta-train/meta-test)
  • fastreid/data/samplers/triplet_sampler.py: data sampler
  • fastreid/modeling/meta_arch/metalearning.py: build model
    • fastreid/modeling/backbones/mobilenet_v2.py or resnet.py: backbone network
    • fastreid/heads/metalearning_head.py: head network (bnneck)
  • fastreid/solver/build.py: build optimizer and scheduler

• fastreid/engine/train_loop.py: main train code

  • run_step_meta_learning1(): update base model
  • run_step_meta_learning2(): update balancing parameters (meta-learning)

10) Handling errors

• AMP
  • If the version of your GPU driver is old, you cannot use AMP(automatic mixed precision).
  • If so, modify the AMP option to False in /MetaBIN/configs/Sample/DG-mobilenet.yml
  • The memory usage will increase.
• Fastreid evaluation
  • If a compile error occurs in fastreid, run the following command.
  • cd fastreid/evaluation/rank_cylib; make all
• No such file or directory 'logs/Sample'
  • Please check logs (section 3)
• No such file or directory 'pretrained'
  • Please check pretrained (section 6)
• No such file or directory 'datasets'
  • Please check datasets (section 8)
• RuntimeError: cuDNN error: CUDNN_STATUS_EXECUTION_FAILED
  • Please check the CUDA version on your graphics card and pytorch.

Citation

@InProceedings{choi2021metabin,
title = {Meta Batch-Instance Normalization for Generalizable Person Re-Identification},
author = {Choi, Seokeon and Kim, Taekyung and Jeong, Minki and Park, Hyoungseob and Kim, Changick},
booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
month = {June},
year = {2021}
}