GarlGuo / amagold

AMAGOLD: Amortized Metropolis Adjustment for Efficient Stochastic Gradient MCMC

This repository contains code for AMAGOLD: Amortized Metropolis Adjustment for Efficient Stochastic Gradient MCMC, AISTATS, 2020

Dependencies

• Python 2.7
• PyTorch 1.2.0

Double-well Potential Density

To generate samples from the double-well potential by SGHMC and AMAGOLD, please run simulation/doublewell_sghmc.m and simulation/doublewell_amagold.m respectively.

To visualize the results, please use ipython notebook with Python to open the file simulation/dooublewell.ipynb. Cached results from our runs are included.

Bayesian Neural Networks on MNIST

To get SGD initialization, run

python bnn/train_SGD.py

To run SGHMC and AMAGOLD:

python bnn/train_sghmc.py

and

python bnn/train_amagold.py

With lr = 0.0005 and a = 1e-5, SGHMC will diverge after about 500 epochs.