Torchreid

Torchreid is a library built on PyTorch for deep-learning person re-identification.

It features:

  • multi-GPU training

  • support both image- and video-reid

  • end-to-end training and evaluation

  • incredibly easy preparation of reid datasets

  • multi-dataset training

  • cross-dataset evaluation

  • standard protocol used by most research papers

  • highly extensible (easy to add models, datasets, training methods, etc.)

  • implementations of state-of-the-art deep reid models

  • access to pretrained reid models

  • advanced training techniques

  • visualization tools (tensorboard, ranks, etc.)

Code: https://github.com/KaiyangZhou/deep-person-reid.

Documentation: https://kaiyangzhou.github.io/deep-person-reid/.

How-to instructions: https://kaiyangzhou.github.io/deep-person-reid/user_guide.

Model zoo: https://kaiyangzhou.github.io/deep-person-reid/MODEL_ZOO.

Installation

Make sure your conda is installed.

# cd to your preferred directory and clone this repo
git clone https://github.com/KaiyangZhou/deep-person-reid.git

# create environment
cd deep-person-reid/
conda create --name torchreid python=3.7
conda activate torchreid

# install dependencies
# make sure `which python` and `which pip` point to the correct path
pip install -r requirements.txt

# install torch and torchvision (select the proper cuda version to suit your machine)
conda install pytorch torchvision cudatoolkit=9.0 -c pytorch

# install torchreid (don't need to re-build it if you modify the source code)
python setup.py develop

Get started: 30 seconds to Torchreid

  1. Import torchreid

import torchreid
  1. Load data manager

datamanager = torchreid.data.ImageDataManager(
    root='reid-data',
    sources='market1501',
    targets='market1501',
    height=256,
    width=128,
    batch_size_train=32,
    batch_size_test=100,
    transforms=['random_flip', 'random_crop']
)

3 Build model, optimizer and lr_scheduler

model = torchreid.models.build_model(
    name='resnet50',
    num_classes=datamanager.num_train_pids,
    loss='softmax',
    pretrained=True
)

model = model.cuda()

optimizer = torchreid.optim.build_optimizer(
    model,
    optim='adam',
    lr=0.0003
)

scheduler = torchreid.optim.build_lr_scheduler(
    optimizer,
    lr_scheduler='single_step',
    stepsize=20
)
  1. Build engine

engine = torchreid.engine.ImageSoftmaxEngine(
    datamanager,
    model,
    optimizer=optimizer,
    scheduler=scheduler,
    label_smooth=True
)
  1. Run training and test

engine.run(
    save_dir='log/resnet50',
    max_epoch=60,
    eval_freq=10,
    print_freq=10,
    test_only=False
)

A unified interface

In “deep-person-reid/scripts/”, we provide a unified interface to train and test a model. See “scripts/main.py” and “scripts/default_config.py” for more details. “configs/” contains some predefined configs which you can use as a starting point.

Below we provide examples to train and test OSNet (Zhou et al. ICCV’19). Assume PATH_TO_DATA is the directory containing reid datasets.

Conventional setting

To train OSNet on Market1501, do

python scripts/main.py \
--config-file configs/im_osnet_x1_0_softmax_256x128_amsgrad_cosine.yaml \
--transforms random_flip random_erase \
--root $PATH_TO_DATA \
--gpu-devices 0

The config file sets Market1501 as the default dataset. If you wanna use DukeMTMC-reID, do

python scripts/main.py \
--config-file configs/im_osnet_x1_0_softmax_256x128_amsgrad_cosine.yaml \
-s dukemtmcreid \
-t dukemtmcreid \
--transforms random_flip random_erase \
--root $PATH_TO_DATA \
--gpu-devices 0 \
data.save_dir log/osnet_x1_0_dukemtmcreid_softmax_cosinelr

The code will automatically (download and) load the ImageNet pretrained weights. After the training is done, the model will be saved as “log/osnet_x1_0_market1501_softmax_cosinelr/model.pth.tar-250”. Under the same folder, you can find the tensorboard file. To visualize the learning curves using tensorboard, you can run tensorboard --logdir=log/osnet_x1_0_market1501_softmax_cosinelr in the terminal and visit http://localhost:6006/ in your web browser.

Evaluation is automatically performed at the end of training. To run the test again using the trained model, do

python scripts/main.py \
--config-file configs/im_osnet_x1_0_softmax_256x128_amsgrad_cosine.yaml \
--root $PATH_TO_DATA \
--gpu-devices 0 \
model.load_weights log/osnet_x1_0_market1501_softmax_cosinelr/model.pth.tar-250 \
test.evaluate True

Cross-domain setting

Suppose you wanna train OSNet on DukeMTMC-reID and test its performance on Market1501, you can do

python scripts/main.py \
--config-file configs/im_osnet_x1_0_softmax_256x128_amsgrad.yaml \
-s dukemtmcreid \
-t market1501 \
--transforms random_flip color_jitter \
--root $PATH_TO_DATA \
--gpu-devices 0

Here we only test the cross-domain performance. However, if you also want to test the performance on the source dataset, i.e. DukeMTMC-reID, you can set -t dukemtmcreid market1501, which will evaluate the model on the two datasets separately.

Different from the same-domain setting, here we replace random_erase with color_jitter. This can improve the generalization performance on the unseen target dataset.

Pretrained models are available in the Model Zoo.

Citation

If you find this code useful to your research, please cite the following publication.

@article{zhou2019osnet,
  title={Omni-Scale Feature Learning for Person Re-Identification},
  author={Zhou, Kaiyang and Yang, Yongxin and Cavallaro, Andrea and Xiang, Tao},
  journal={arXiv preprint arXiv:1905.00953},
  year={2019}
}

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