Wednesday, February 6, 2013

active learning for multi-objective optimization

  • same orders of magnitude as joe
  • technique seems a little more complex
  • no execution on standard models (i think)

Marcela ZuluagaAndreas KrauseGuillaume Sergent and Markus Püschel (to appear in Proc. International Conference on Machine Learning (ICML), 2013)
Active Learning for Multi-Objective Optimization
In many fields one encounters the challenge of identifying, out of a pool of possible designs, those that simultaneously optimize multiple objectives. This means that usually there is not one optimal design but an entire set of Pareto-optimal ones with optimal trade-offs in the objectives. In many applications, evaluating one design is expensive; thus, an exhaustive search for the Pareto-optimal set is unfeasible. To address this challenge, we propose the Pareto Active Learning (PAL) algorithm which intelligently samples the design space to predict the Pareto-optimal set. Key features of PAL include (1) modeling the objectives as samples from a Gaussian process distribution to capture structure and accomodate noisy evaluation; (so parametric assumptions)  (2) a method to carefully choose the next design to evaluate to maximize progress; and (3) the ability to control prediction accuracy and sampling cost. We provide theoretical bounds on PAL’s sampling cost required to achieve a desired accuracy. Further, we show an experimental evaluation on three real-world data sets (only 3???). The results show PAL’s effectiveness; in particular it improves significantly over a state-of-the-art multi-objective optimization method, saving in many cases about 33% evaluations to achieve the same accuracy.

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