awesome-equivariant-network

Paper list for equivariant neural network. Work-in-progress.

Feel free to suggest relevant papers in the following format.

	**Group Equivariant Convolutional Networks**  
   Taco S. Cohen, Max Welling ICML 2016 [paper](https://arxiv.org/pdf/1602.07576.pdf)   

Acknowledgement: I would like to thank Maurice Weiler, Fabian Fuchs, Tess Smidt, David Pfau, Jonas Köhler for paper suggestions!

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  1. Group Equivariant Convolutional Networks
    Taco S. Cohen, Max Welling ICML 2016 paper
    Note: first paper; discrete group;
  2. Steerable CNNs
    Taco S. Cohen, Max Welling ICLR 2017 paper
  3. Harmonic Networks: Deep Translation and Rotation Equivariance
    Daniel E. Worrall, Stephan J. Garbin, Daniyar Turmukhambetov, Gabriel J. Brostow CVPR 2017 paper
  4. Spherical CNNs
    Taco S. Cohen, Mario Geiger, Jonas Koehler, Max Welling ICLR 2018 best paper paper
    Note: use generalized FFT to speed up convolution on $S^2$ and $SO(3)$
  5. Clebsch–Gordan Nets: a Fully Fourier Space Spherical Convolutional Neural Network
    Risi Kondor, Zhen Lin, Shubhendu Trivedi NeurIPS 2018 paper
    Note: perform equivariant nonlinearity in Fourier space;
  6. General E(2)-Equivariant Steerable CNNs
    Maurice Weiler, Gabriele Cesa NeurIPS 2019 paper
    Note: nice benchmark on different reprsentations
  7. Learning Steerable Filters for Rotation Equivariant CNNs
    Maurice Weiler, Fred A. Hamprecht, Martin Storath CVPR 2018 paper
    Note: group convolutions, kernels parameterized in circular harmonic basis (steerable filters);
  8. Learning SO(3) Equivariant Representations with Spherical CNNs
    Carlos Esteves, Christine Allen-Blanchette, Ameesh Makadia, Kostas Daniilidis ECCV 2018 paper
    Note: SO(3) equivariance; zonal filter
  9. 3D Steerable CNNs: Learning Rotationally Equivariant Features in Volumetric Data
    Maurice Weiler, Mario Geiger, Max Welling, Wouter Boomsma, Taco Cohen NeurIPS 2018 paper
    Note: SE(3) equivariance; characterize the basis of steerable kernel
  10. Tensor field networks: Rotation- and translation-equivariant neural networks for 3D point clouds
    Nathaniel Thomas, Tess Smidt, Steven Kearnes, Lusann Yang, Li Li, Kai Kohlhoff, Patrick Riley paper
    Note: SE(3) equivariance for point clouds
  11. Gauge Equivariant Convolutional Networks and the Icosahedral CNN
    Taco S. Cohen, Maurice Weiler, Berkay Kicanaoglu, Max Welling ICML 2019 paper
    Note: gauge equivariance on general manifold
  12. Cormorant: Covariant Molecular Neural Networks
    Brandon Anderson, Truong-Son Hy, Risi Kondor NeurIPS 2019 paper
  13. Deep Scale-spaces: Equivariance Over Scale
    Daniel Worrall, Max Welling NeurIPS 2019 paper
  14. SE(3)-Transformers: 3D Roto-Translation Equivariant Attention Networks
    Fabian B. Fuchs, Daniel E. Worrall, Volker Fischer, Max Welling NeurIPS 2020 paper, blog
    Note: TFN + equivariant self-attention; improved spherical harmonics computation
  15. Gauge Equivariant Mesh CNNs: Anisotropic convolutions on geometric graphs
    Pim de Haan, Maurice Weiler, Taco Cohen, Max Welling ICLR 2021 paper
    Note: anisotropic gauge equivariant kernels + message passing by parallel transporting features over mesh edges
  16. Lorentz Group Equivariant Neural Network for Particle Physics
    Alexander Bogatskiy, Brandon Anderson, Jan T. Offermann, Marwah Roussi, David W. Miller, Risi Kondor ICML 2020 paper
    Note: SO(1, 3) equivariance
  17. Generalizing Convolutional Neural Networks for Equivariance to Lie Groups on Arbitrary Continuous Data
    Marc Finzi, Samuel Stanton, Pavel Izmailov, Andrew Gordon Wilson ICML 2020 paper
    Note: fairly generic architecture; use Monte Carlo sampling to achieve equivariance in expectation;
  18. Spin-Weighted Spherical CNNs
    Carlos Esteves, Ameesh Makadia, Kostas Daniilidis NeurIPS 2020 paper
    Note: anisotropic filter for vector field on sphere
  19. Learning Invariances in Neural Networks
    Gregory Benton, Marc Finzi, Pavel Izmailov, Andrew Gordon Wilson NeurIPS 2020 paper
    Note: very interesting approch; enfore "soft" invariance via learning over both model parameters and distributions over augmentations
  20. Lie Algebra Convolutional Neural Networks with Automatic Symmetry Extraction
    Nima Dehmamy, Yanchen Liu, Robin Walters, Rose Yu paper
    Note: very interesting paper; It’s unfortunate that it is rejected by ICLR 2021
  21. LieTransformer: Equivariant self-attention for Lie Groups
    Michael Hutchinson, Charline Le Lan, Sheheryar Zaidi, Emilien Dupont, Yee Whye Teh, Hyunjik Kim paper
    Note: equivariant self attention to arbitrary Lie groups and their discrete subgroups
  1. On the Generalization of Equivariance and Convolution in Neural Networks to the Action of Compact Groups
    Risi Kondor, Shubhendu Trivedi ICML 2018 paper
    Note: convolution is all you need (for scalar fields)

  2. A General Theory of Equivariant CNNs on Homogeneous Spaces
    Taco Cohen, Mario Geiger, Maurice Weiler NeurIPS 2019 paper
    Note: convolution is all you need (for general fields)

  3. Equivariance Through Parameter-Sharing
    Siamak Ravanbakhsh, Jeff Schneider, Barnabas Poczos ICML 2017 paper

  4. Universal approximations of invariant maps by neural networks
    Dmitry Yarotsky paper

  5. A Wigner-Eckart Theorem for Group Equivariant Convolution Kernels
    Leon Lang, Maurice Weiler ICLR 2021 paper
    Note: steerable kernel spaces are fully understood and parameterized in terms of 1) generalized reduced matrix elements, 2) Clebsch-Gordan coefficients, and 3) harmonic basis functions on homogeneous spaces.

  6. On the Universality of Rotation Equivariant Point Cloud Networks
    Nadav Dym, Haggai Maron ICLR 2021 paper,
    Note: universality for TFN and se3-transformer

  7. Universal Equivariant Multilayer Perceptrons
    Siamak Ravanbakhsh paper

  1. Equivariant Flows: Exact Likelihood Generative Learning for Symmetric Densities
    Jonas Köhler, Leon Klein, Frank Noé ICML 2020 paper
    Note: general framework for constructing equivariant normalizing flows on euclidean spaces. Instantiation for particle systems/point clouds = simultanoues SE(3) and permutation equivariance.
  2. Equivariant Hamiltonian Flows
    Danilo Jimenez Rezende, Sébastien Racanière, Irina Higgins, Peter Toth NeurIPS 2019 ML4Phys workshop paper
    Note: general framework for constructing equivariant normalizing flows in phase space utilizing Hamiltonian dynamics. Instantiation for SE(2) equivariance.
  3. Sampling using SU(N) gauge equivariant flows
    Denis Boyda, Gurtej Kanwar, Sébastien Racanière, Danilo Jimenez Rezende, Michael S. Albergo, Kyle Cranmer, Daniel C. Hackett, Phiala E. Shanahan paper
    Note: normalizing flows for lattice gauge theory. Instantiation for SU(2)/SU(3) equivariance.
  4. Exchangeable neural ode for set modeling
    Yang Li, Haidong Yi, Christopher M. Bender, Siyuan Shan, Junier B. Oliva NeurIPS 2020 paper
    Note: framework for permutation equivariant flows for set data. Instantiation for permutation equivariance.
  5. Equivariant Normalizing Flows for Point Processes and Sets
    Marin Biloš, Stephan Günnemann NeurIPS 2020 paper
    Note: framework for permutation equivariant flows for set data. Instantiation for permutation equivariance.
  6. The Convolution Exponential and Generalized Sylvester Flows
    Emiel Hoogeboom, Victor Garcia Satorras, Jakub M. Tomczak, Max Welling NeurIPS 2020 paper
    Note: invertible convolution operators. Instantiation for permutation equivariance.
  7. Targeted free energy estimation via learned mappings
    Peter Wirnsberger, Andrew J. Ballard, George Papamakarios, Stuart Abercrombie, Sébastien Racanière, Alexander Pritzel, Danilo Jimenez Rezende, Charles Blundell J Chem Phys. 2020 Oct 14;153(14):144112. paper
    Note: normalizing flows for particle systems on a torus. Instantiation for permutation equivariance.
  8. Temperature-steerable flows
    Manuel Dibak, Leon Klein, Frank Noé NeurIPS 2020 ML4Phys workshops paper
    Note: normalizing flows in phase space with equivariance with respect to changes in temperature.
  1. Trajectory Prediction using Equivariant Continuous Convolution
    Robin Walters, Jinxi Li, Rose Yu ICLR 2021 paper
  2. Incorporating Symmetry into Deep Dynamics Models for Improved Generalization
    Rui Wang, Robin Walters, Rose Yu ICLR 2021 paper
  3. SE(3)-Equivariant Graph Neural Networks for Data-Efficient and Accurate Interatomic Potentials
    Simon Batzner, Tess E. Smidt, Lixin Sun, Jonathan P. Mailoa, Mordechai Kornbluth, Nicola Molinari, Boris Kozinsky paper
  4. Finding Symmetry Breaking Order Parameters with Euclidean Neural Networks
    Tess E. Smidt, Mario Geiger, Benjamin Kurt Miller paper
  5. Group Equivariant Generative Adversarial Networks
    Neel Dey, Antong Chen, Soheil Ghafurian ICLR 2021 paper
  6. Ab-Initio Solution of the Many-Electron Schrödinger Equation with Deep Neural Networks
    David Pfau, James S. Spencer, Alexander G. de G. Matthews, W. M. C. Foulkes paper

There are many paper on this topics. I only added very few of them.

  1. PointNet: Deep Learning on Point Sets for 3D Classification and Segmentation
    Charles R. Qi, Hao Su, Kaichun Mo, Leonidas J. Guibas CVPR 2017 paper
  2. Deep Sets
    Manzil Zaheer, Satwik Kottur, Siamak Ravanbakhsh, Barnabas Poczos, Ruslan Salakhutdinov, Alexander Smola NeurIPS 2017 paper
  3. Invariant and Equivariant Graph Networks
    Haggai Maron, Heli Ben-Hamu, Nadav Shamir, Yaron Lipman ICLR 2019 paper
  4. Provably Powerful Graph Networks
    Haggai Maron, Heli Ben-Hamu, Hadar Serviansky, Yaron Lipman NeurIPS 2019 paper
  5. Universal Invariant and Equivariant Graph Neural Networks
    Nicolas Keriven, Gabriel Peyré NeurIPS 2019 paper
  6. On Learning Sets of Symmetric Elements
    Haggai Maron, Or Litany, Gal Chechik, Ethan Fetaya ICML 2020 best paper
  7. On the Universality of Invariant Networks
    Haggai Maron, Ethan Fetaya, Nimrod Segol, Yaron Lipman paper

IAS: Graph Nets: The Next Generation - Max Welling - YouTube

Equivariance and Data Augmentation workshop: many nice talks

IPAM: Tess Smidt: "Euclidean Neural Networks for Emulating Ab Initio Calculations and Generating Atomi..." - YouTube

IPAM: E(3) Equivariant Neural Network Tutorial

IPAM: Risi Kondor: "Fourier space neural networks"

NeurIPS 2020 tutorial: Equivariant Networks

Yaron Lipman - Deep Learning of Irregular and Geometric Data - YouTube

There are many paper I haven't read carefully yet.

  1. Making Convolutional Networks Shift-Invariant Again
    Richard Zhang ICML 2019 paper
  2. Probabilistic symmetries and invariant neural networks
    Benjamin Bloem-Reddy, Yee Whye Teh JMLR paper
  3. On Representing (Anti)Symmetric Functions
    Marcus Hutter paper