Optimizing complex loss functions in structured prediction

  • Authors:
  • Mani Ranjbar;Greg Mori;Yang Wang

  • Affiliations:
  • School of Computing Science, Simon Fraser University, Canada;School of Computing Science, Simon Fraser University, Canada;School of Computing Science, Simon Fraser University, Canada

  • Venue:
  • ECCV'10 Proceedings of the 11th European conference on Computer vision: Part II
  • Year:
  • 2010

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Abstract

In this paper we develop an algorithm for structured prediction that optimizes against complex performance measures, those which are a function of false positive and false negative counts. The approach can be directly applied to performance measures such as Fβ score (natural language processing), intersection over union (image segmentation), Precision/Recall at k (search engines) and ROC area (binary classifiers). We attack this optimization problem by approximating the loss function with a piecewise linear function and relaxing the obtained QP problem to a LP which we solve with an off-the-shelf LP solver. We present experiments on object class-specific segmentation and show significant improvement over baseline approaches that either use simple loss functions or simple compatibility functions on VOC 2009.