Expectation of f-measures: tractable exact computation and some empirical observations of its properties

Authors:
Kian Ming Adam Chai
Affiliations:
DSO National Laboratories, Singapore
Venue:
Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval
Year:
2005

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Abstract

We derive a tractable and exact computation for the expectation of F-measures. We also demonstrate the non-convexity of this expectation, and investigate errors of approximating the expectation under different settings.