ECONOMIC HYPERPARAMETER OPTIMIZATION WITH BLENDED SEARCH STRATEGY

Chi Wang, Qingyun Wu, Silu Huang, Amin Saied

Keywords: HYPERPARAMETER OPTIMIZATION, COST

Abstract:

We study the problem of using low cost to search for hyperparameter configurations in a large search space with heterogeneous evaluation cost and model quality.
We propose a blended search strategy to combine the strengths of global and local search, and prioritize them on the fly with the goal of minimizing the total cost spent in finding good configurations. Our approach demonstrates robust performance for tuning both tree-based models and deep neural networks on a large AutoML benchmark, as well as superior performance in model quality, time, and resource consumption for a production transformer-based NLP model fine-tuning task.

One-sentence Summary: A low-cost hyperparameter optimization solution by blending global and local search methods with cost-based prioritization

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