Bayesian-Torch: Bayesian neural network layers for uncertainty estimation

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Bayesian layers and utilities to perform stochastic variational inference in PyTorch

Bayesian-Torch is a library of neural network layers and utilities extending the core of PyTorch to enable the user to perform stochastic variational inference in Bayesian deep neural networks. Bayesian-Torch is designed to be flexible and seamless in extending a deterministic deep neural network architecture to corresponding Bayesian form by simply replacing the deterministic layers with Bayesian layers.

The repository has implementations for the following Bayesian layers:

• Variational layers with reparameterized Monte Carlo estimators [Blundell et al. 2015]

  LinearVariational 
  Conv1dVariational, Conv2dVariational, Conv3dVariational, ConvTranspose1dVariational, ConvTranspose2dVariational, ConvTranspose3dVariational
  LSTMVariational
  

• Variational layers with Flipout Monte Carlo estimators [Wen et al. 2018]

  LinearFlipout 
  Conv1dFlipout, Conv2dFlipout, Conv3dFlipout, ConvTranspose1dFlipout, ConvTranspose2dFlipout, ConvTranspose3dFlipout
  LSTMFlipout
  

• Variational layers with Gaussian mixture model (GMM) posteriors using reparameterized Monte Carlo estimators (in pre-alpha)

  LinearMixture
  Conv1dMixture, Conv2dMixture, Conv3dMixture, ConvTranspose1dMixture, ConvTranspose2dMixture, ConvTranspose3dMixture
  LSTMMixture
  

Please refer to documentation of Bayesian layers for details.

Other features include:

• MOPED: specifying weight priors and variational posteriors with Empirical Bayes [Krishnan et al. 2019]
• AvUC: Accuracy versus Uncertainty Calibration [Krishnan et al. 2020]

Installation

Install from source:

git clone https://github.com/IntelLabs/bayesian-torch
cd bayesian-torch
pip install .

This code has been tested on PyTorch v1.6.0 and torchvision v0.7.0 with python 3.7.7.

Dependencies:

• Create conda environment with python=3.7
• Install PyTorch and torchvision packages within conda environment following instructions from PyTorch install guide
• conda install -c conda-forge accimage
• pip install tensorboard
• pip install scikit-learn

Example usage

We have provided example model implementations using the Bayesian layers.

We also provide example usages and scripts to train/evaluate the models. The instructions for CIFAR10 examples is provided below, similar scripts for ImageNet and MNIST are available.

cd bayesian_torch

Training

To train Bayesian ResNet on CIFAR10, run this command:

Mean-field variational inference (Reparameterized Monte Carlo estimator)

sh scripts/train_bayesian_cifar.sh

Mean-field variational inference (Flipout Monte Carlo estimator)

sh scripts/train_bayesian_flipout_cifar.sh

To train deterministic ResNet on CIFAR10, run this command:

Vanilla

sh scripts/train_deterministic_cifar.sh

Evaluation

To evaluate Bayesian ResNet on CIFAR10, run this command:

Mean-field variational inference (Reparameterized Monte Carlo estimator)

sh scripts/test_bayesian_cifar.sh

Mean-field variational inference (Flipout Monte Carlo estimator)

sh scripts/test_bayesian_flipout_cifar.sh

To evaluate deterministic ResNet on CIFAR10, run this command:

Vanilla

sh scripts/test_deterministic_cifar.sh

Citing

If you use this code, please cite as:

@misc{krishnan2020bayesiantorch,
    author = {Ranganath Krishnan and Piero Esposito},
    title = {Bayesian-Torch: Bayesian neural network layers for uncertainty estimation},
    year = {2020},
    publisher = {GitHub},
    howpublished = {\url{https://github.com/IntelLabs/bayesian-torch}}
}

Cite the weight sampling methods as well: Blundell et al. 2015; Wen et al. 2018

Contributors

• Ranganath Krishnan
• Piero Esposito

This code is intended for researchers and developers, enables to quantify principled uncertainty estimates from deep neural network predictions using stochastic variational inference in Bayesian neural networks. Feedbacks, issues and contributions are welcome. Email to [email protected] for any questions.