Equivariant convolutional neural networks for the group E(3) of 3 dimensional rotations, translations, and mirrors.

# e3nn

E(3) is the Euclidean group in dimension 3. That is the group of rotations, translations and mirror. e3nn is a pytorch library that aims to create E(3) equivariant neural networks.

## Installation

After having installed pytorch_geometric run the command:

pip install e3nn

To get the CUDA kernels read the instructions in INSTALL.md.

## Example

from functools import partial

import torch

from e3nn import Kernel, rs
from e3nn.non_linearities.norm import Norm
from e3nn.non_linearities.rescaled_act import swish
from e3nn.point.operations import Convolution

# Define the input and output representations
Rs_in = [(1, 0), (2, 1)]  # Input = One scalar plus two vectors
Rs_out = [(1, 1)]  # Output = One single vector

# Radial model:  R+ -> R^d

# kernel: composed on a radial part that contains the learned parameters
#  and an angular part given by the spherical hamonics and the Clebsch-Gordan coefficients

# Create the convolution module
conv = Convolution(K(Rs_in, Rs_out))

# Module to compute the norm of each irreducible component
norm = Norm(Rs_out)

n = 5  # number of input points
features = rs.randn(1, n, Rs_in, requires_grad=True)
in_geometry = torch.randn(1, n, 3)
out_geometry = torch.zeros(1, 1, 3)  # One point at the origin

out = norm(conv(features, in_geometry, out_geometry))
out.backward()

print(out)


## Hierarchy

• e3nn contains the library
• e3nn/o3.py O(3) irreducible representations
• e3nn/rsh.py real spherical harmonics
• e3nn/rs.py geometrical tensor representations
• e3nn/image contains voxels linear operations
• e3nn/point contains points linear operations
• e3nn/non_linearities non linearities operations
• examples simple scripts and experiments

## Citing

@software{e3nn_2020_3723557,
author       = {Mario Geiger and
Tess Smidt and
Benjamin K. Miller and
Wouter Boomsma and
Kostiantyn Lapchevskyi and
Maurice Weiler and
Michał Tyszkiewicz and
Jes Frellsen},
title        = {github.com/e3nn/e3nn},
month        = may,
year         = 2020,
publisher    = {Zenodo},
version      = {0.0.0},
doi          = {10.5281/zenodo.3723557},
url          = {https://doi.org/10.5281/zenodo.3723557}
}


Euclidean neural networks (e3nn) Copyright (c) 2020, The Regents of the University of California, through Lawrence Berkeley National Laboratory (subject to receipt of any required approvals from the U.S. Dept. of Energy), Ecole Polytechnique Federale de Lausanne (EPFL), Free University of Berlin and Kostiantyn Lapchevskyi. All rights reserved.

NOTICE. This Software was developed under funding from the U.S. Department of Energy and the U.S. Government consequently retains certain rights. As such, the U.S. Government has been granted for itself and others acting on its behalf a paid-up, nonexclusive, irrevocable, worldwide license in the Software to reproduce, distribute copies to the public, prepare derivative works, and perform publicly and display publicly, and to permit others to do so.

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