Multi-Fidelity Active Learning with GFlowNets

Alex Hernández-García, Nikita Saxena, Moksh Jain, Cheng-Hao Liu, Yoshua Bengio

Keywords: gflownets, multi-fidelity, active learning, bayesian optimization, scientific discovery, biological sequence design, molecular modelling, material discovery

TL;DR: We present an algorithm for multi-fidelity active learning with GFlowNets. We demonstrate that it is able to discover diverse, high-scoring samples at lower cost than other relevant baselines.

Abstract: Many relevant scientific and engineering problems present challenges where current machine learning methods cannot yet efficiently leverage the available data and resources. For example, certain relevant problems involve exploring very large, structured and high-dimensional spaces, and where querying a high fidelity, black-box objective function is very expensive. Progress in machine learning methods that can efficiently tackle such problems would help accelerate currently crucial areas such as drug and materials discovery. In this paper, we propose a multi-fidelity active learning algorithm with GFlowNets as a sampler, to efficiently discover diverse, high-scoring candidates where multiple approximations of the black-box function are available at lower fidelity and cost. Our evaluation on molecular discovery tasks show that multi-fidelity active learning with GFlowNets can discover high-scoring candidates at a fraction of the budget of its single-fidelity counterpart while maintaining diversity, unlike RL-based alternatives. These results open new avenues for multi-fidelity active learning to accelerate scientific discovery and engineering design.

Submission Number: 15