Boosted Generative Models

This repository provides a reference implementation for boosted generative models as described in the paper:

Boosted Generative Models
Aditya Grover and Stefano Ermon.
AAAI Conference on Artificial Intelligence (AAAI), 2018.
https://arxiv.org/pdf/1702.08484.pdf

Requirements

The codebase is implemented in Python 3.6. To install the necessary requirements, run the following commands:

pip install -r requirements.txt
bash install.sh

Datasets

The code takes an input dataset in csv file. Every row indicates one datapoint with comma-separated features. A sample train, validation, and test file for the nltcs dataset is included in the data/ directory.

Options

Learning and inference of boosted generative models is handled by the main.py script which provides the following command line arguments.

  --seed INT                 Random seed for numpy, tensorflow
  --datadir STR              Directory containing dataset files
  --dataset STR              Name of dataset
  --resultdir STR            Directory for saving tf checkpoints
  --run-addbgm BOOL          Runs additive boosting if True
  --addbgm-alpha FLOAT LIST  Space-separated list of model weights for additive boosting
  --run-genbgm BOOL          Runs multiplicative generative boosting if True
  --genbgm-alpha FLOAT LIST  Space-separated list of model weights for multiplicative generative boosting
  --genbgm-beta FLOAT LIST   Space-separated list of reweighting exponents for multiplicative generative boosting
  --run-discbgm BOOL         Runs multiplicative discriminative boosting if True
  --discbgm-alpha FLOAT LIST Space-separated list of model weights for multiplicative generative boosting
  --discbgm-epochs INT       Number of epochs of training for each discriminator
  --discbgm-burn-in INT      Number of discarded burn in samples for Markov chains
  --run-classifier BOOL      Uses generative model for classification if True

Examples

The following commands learns boosted ensembles with two models and evaluates the ensemble for density estimation and classification.

Meta-algorithm: multiplicative generative boosting

python src/main.py --dataset nltcs --run-genbgm --genbgm-alpha 0.5 0.5 --genbgm-beta 0.25 0.125 --run-classifier

Meta-algorithm: multiplicative discriminative boosting

python src/main.py --dataset nltcs --run-discbgm --discbgm-alpha 1. 1. --run-classifier

Meta-algorithm: additive boosting

python src/main.py --dataset nltcs --run-addbgm --addbgm-alpha 0.5 0.25 --run-classifier

You can also run any combination of the meta-algorithms together as shown below.

python src/main.py --dataset nltcs --run-genbgm --genbgm-alpha 0.5 0.5 --genbgm-beta 0.25 0.125 --run-discbgm --discbgm-alpha 1. 1. --run-addbgm --addbgm-alpha 0.5 0.25 --run-classifier

Citing

If you find boosted generative models useful in your research, please consider citing the following paper:

@inproceedings{grover2018boosted,
title={Boosted Generative Models},
author={Grover, Aditya and Ermon, Stefano},
booktitle={AAAI Conference on Artificial Intelligence},
year={2018}}