pytorCH OPtimize (CHOP): a library for continuous and constrained optimization built on PyTorch

...with applications to adversarially attacking and training neural networks.

⚠️ This library is not actively maintained anymore, and I won't be handling new issues in a timely manner. Contact me if you'd like to contribute. ⚠️

Stochastic Algorithms

We define stochastic optimizers in the chop.stochastic module. These follow PyTorch Optimizer conventions, similar to the torch.optim module. These can be used to

• train structured models;
• compute universal adversarial perturbations over a dataset.

Full Gradient Algorithms

We also define full-gradient algorithms which operate on a batch of optimization problems in the chop.optim module. These are used for adversarial attacks, using the chop.Adversary wrapper.

Installing

Run the following:

pip install chop-pytorch

or

pip install git+https://github.com/openopt/chop.git

for the latest development version.

Welcome to chop!

Examples:

See examples directory and our webpage.

Tests

Run the tests with pytests tests.

Citing

If this software is useful to your research, please consider citing it as

@article{chop,
  author       = {Geoffrey Negiar, Fabian Pedregosa},
  title        = {CHOP: continuous optimization built on Pytorch},
  year         = 2020,
  url          = {https://github.com/openopt/chop}
}

Affiliations

Geoffrey Négiar was in the Mahoney lab and the El Ghaoui lab at UC Berkeley at the time this package was developped.

Fabian Pedregosa is at Google Research.