Large Scale Ranking Problem: some theoretical and algorithmic issues

author: Tong Zhang, Department of Statistics, Rutgers, The State University of New Jersey
published: Feb. 25, 2007,   recorded: July 2006,   views: 371
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Description

The talk is divided into two parts. The first part focuses on web-search ranking, for which I discuss training relevance models based on DCG (discounted cumulated gain) optimization. Under this metric, the system output quality is naturally determined by the performance near the top of its rank-list. I will mainly focus on various theoretical issues for this learning problem. The second part discusses related algorithmic issues in the context of optimizing the scoring function of a statistical machine translation system according to the BLEU metric (standard measure of translation quality). Our approach treats machine translation as a black-box, and can optimize millions of system parameters automatically. This has not been attempted before in this context. I will present our method and some initial results.

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