  Machine learning (ML) methods offer a wide range of configurable
hyperparameters that have a significant influence on their performance. While
accuracy is a commonly used performance objective, in many settings, it is not
sufficient. Optimizing the ML models with respect to multiple objectives such
as accuracy, confidence, fairness, calibration, privacy, latency, and memory
consumption is becoming crucial. To that end, hyperparameter optimization, the
approach to systematically optimize the hyperparameters, which is already
challenging for a single objective, is even more challenging for multiple
objectives. In addition, the differences in objective scales, the failures, and
the presence of outlier values in objectives make the problem even harder. We
propose a multi-objective Bayesian optimization (MoBO) algorithm that addresses
these problems through uniform objective normalization and randomized weights
in scalarization. We increase the efficiency of our approach by imposing
constraints on the objective to avoid exploring unnecessary configurations
(e.g., insufficient accuracy). Finally, we leverage an approach to parallelize
the MoBO which results in a 5x speed-up when using 16x more workers.

Machine Learning;Distributed, Parallel, and Cluster Computing