Particle Transformer

This repo is the official implementation of "Particle Transformer for Jet Tagging". It includes the code, pre-trained models, and the JetClass dataset.

Introduction

JetClass dataset

JetClass is a new large-scale jet tagging dataset proposed in "Particle Transformer for Jet Tagging". It consists of 100M jets for training, 5M for validation and 20M for testing. The dataset contains 10 classes of jets, simulated with MadGraph + Pythia + Delphes:

Particle Transformer (ParT)

The Particle Transformer (ParT) architecture is described in "Particle Transformer for Jet Tagging", which can serve as a general-purpose backbone for jet tagging and similar tasks in particle physics. It is a Transformer-based architecture, enhanced with pairwise particle interaction features that are incorporated in the multi-head attention as a bias before softmax. The ParT architecture outperforms the previous state-of-the-art, ParticleNet, by a large margin on various jet tagging benchmarks.

Getting started

Download the datasets

To download the JetClass/QuarkGluon/TopLandscape datasets:

./get_datasets.py [JetClass|QuarkGluon|TopLandscape] [-d DATA_DIR]

After download, the dataset paths will be updated in the env.sh file.

Training

The ParT models are implemented in PyTorch and the training is based on the weaver framework for dataset loading and transformation. To install weaver, run:

python pip install 'weaver-core>=0.4'

To run the training on the JetClass dataset:

./train_JetClass.sh [ParT|PN|PFN|PCNN] [kin|kinpid|full] ...

where the first argument is the model:

• ParT: Particle Transformer
• PN: ParticleNet
• PFN: Particle Flow Network
• PCNN: P-CNN

and the second argument is the input feature sets:

• kin: only kinematic inputs
• kinpid: kinematic inputs + particle identification
• full (default): kinematic inputs + particle identification + trajectory displacement

Additional arguments will be passed directly to the weaver command, such as --batch-size, --start-lr, --gpus, etc., and will override existing arguments in train_JetClass.sh.

Multi-gpu support:

• using PyTorch's DataParallel multi-gpu training:

./train_JetClass.sh ParT full --gpus 0,1,2,3 --batch-size [total_batch_size] ...

• using PyTorch's DistributedDataParallel:

DDP_NGPUS=4 ./train_JetClass.sh ParT full --batch-size [batch_size_per_gpu] ...

To run the training on the QuarkGluon dataset:

./train_QuarkGluon.sh [ParT|ParT-FineTune|PN|PN-FineTune|PFN|PCNN] [kin|kinpid|kinpidplus] ...

To run the training on the TopLandscape dataset:

./train_TopLandscape.sh [ParT|ParT-FineTune|PN|PN-FineTune|PFN|PCNN] [kin] ...

The argument ParT-FineTune or PN-FineTune will run the fine-tuning using models pre-trained on the JetClass dataset.

Citations

If you use the Particle Transformer code and/or the JetClass dataset, please cite:

``` @InProceedings{Qu:2022mxj, author = "Qu, Huilin and Li, Congqiao and Qian, Sitian", title = "{Particle Transformer} for Jet Tagging", booktitle = "{Proceedings of the 39th International Conference on Machine Learning}", pages = "18281--18292", year = "2022", eprint = "2202.03772", archivePrefix = "arXiv", primaryClass = "hep-ph" }

@dataset{JetClass, author = "Qu, Huilin and Li, Congqiao and Qian, Sitian", title = "{JetClass}: A Large-Scale Dataset for Deep Learning in Jet Physics", month = "jun", year = "2022", publisher = "Zenodo", version = "1.0.0", doi = "10.5281/zenodo.6619768", url = "https://doi.org/10.5281/zenodo.6619768" } ```

Additionally, if you use the ParticleNet model, please cite:

@article{Qu:2019gqs, author = "Qu, Huilin and Gouskos, Loukas", title = "{ParticleNet: Jet Tagging via Particle Clouds}", eprint = "1902.08570", archivePrefix = "arXiv", primaryClass = "hep-ph", doi = "10.1103/PhysRevD.101.056019", journal = "Phys. Rev. D", volume = "101", number = "5", pages = "056019", year = "2020" }

For the QuarkGluon dataset, please cite:

``` @article{Komiske:2018cqr, author = "Komiske, Patrick T. and Metodiev, Eric M. and Thaler, Jesse", title = "{Energy Flow Networks: Deep Sets for Particle Jets}", eprint = "1810.05165", archivePrefix = "arXiv", primaryClass = "hep-ph", reportNumber = "MIT-CTP 5064", doi = "10.1007/JHEP01(2019)121", journal = "JHEP", volume = "01", pages = "121", year = "2019" }

@dataset{komiskepatrick2019_3164691, author = {Komiske, Patrick and Metodiev, Eric and Thaler, Jesse}, title = {Pythia8 Quark and Gluon Jets for Energy Flow}, month = may, year = 2019, publisher = {Zenodo}, version = {v1}, doi = {10.5281/zenodo.3164691}, url = {https://doi.org/10.5281/zenodo.3164691} } ```

For the TopLandscape dataset, please cite:

``` @article{Kasieczka:2019dbj, author = "Butter, Anja and others", editor = "Kasieczka, Gregor and Plehn, Tilman", title = "{The Machine Learning landscape of top taggers}", eprint = "1902.09914", archivePrefix = "arXiv", primaryClass = "hep-ph", doi = "10.21468/SciPostPhys.7.1.014", journal = "SciPost Phys.", volume = "7", pages = "014", year = "2019" }

@dataset{kasieczkagregor2019_2603256, author = {Kasieczka, Gregor and Plehn, Tilman and Thompson, Jennifer and Russel, Michael}, title = {Top Quark Tagging Reference Dataset}, month = mar, year = 2019, publisher = {Zenodo}, version = {v0 (2018_03_27)}, doi = {10.5281/zenodo.2603256}, url = {https://doi.org/10.5281/zenodo.2603256} } ```