NoPeekNN

!! NOTE: THE PYSYFT IMPLEMENTATION DOES NOT CURRENTLY WORK. USE BRANCH no-syft FOR A WORKING IMPLEMENTATION OF NOPEEK !!

PyTorch implementation of NoPeekNN, currently trained on MNIST. We implement a black box model inversion attack to validate the protection afforded by NoPeek.

This implementation uses PySyft to simulate distributed training, as would happen in applied SplitNN.

What is NoPeekNN?

NoPeekNN is an extension to SplitNNs to preserve privacy. While SplitNNs do not send raw data to a potentially untrustworthy central server, it has been shown that raw data can be reverse engineered from the model. NoPeekNN attempts to limit this by training the model to produce an intermediate data representation (sent between model parts) as distinct from the input data as possible while retaining the information necessary to successfully complete the task.

This is achieved by adding a term to the loss function which minimises distance covariance between the input and intermediate data.

Requirements

This code has been written in python 3.7 and PyTorch 1.5.0, however other versions may work.

If using conda, run

conda env create -f environment.yml

to create an environment, nopeek, with all the necessary packages.

Run

conda env create -f environment-lock.yml

to create an environment with the exact package versions used to develop this code.

Get started

To train a SplitNN on MNIST with a NoPeekLoss, un python main.py --nopeek_weight <weight> where <weight> is a float.

Models are saved to the models/ directory. We have provided a selection of trained models.

See other optional arguments with python main.py --help.

Trained

NoPeek loss is computationally demanding and scales with the size of a data batch, so it is recommended to stick to small (<64) batch sizes.