Model-based Asynchronous Hyperparameter and Neural Architecture Search
Authors: Aaron Klein, Louis Chi-Chun Tiao, Thibaut Lienart, Cedric Archambeau, Matthias Seeger
Keywords: Bayesian Optimization, AutoML, Hyperparameter Optimization, Neural Architecture Search
Abstract: We introduce a model-based asynchronous multi-fidelity method for hyperparameter and neural architecture search that combines the strengths of asynchronous Successive Halving and Gaussian process-based Bayesian optimization. At the heart of our method is a probabilistic model that can simultaneously reason across hyperparameters and resource levels, and supports decision-making in the presence of pending evaluations. We demonstrate the effectiveness of our method on a wide range of challenging benchmarks, for tabular data, image classification and language modelling, and report substantial speed-ups over current state-of-the-art methods. Our new methods, along with asynchronous baselines, are implemented in a distributed framework which will be open sourced along with this publication.