Large Scale Ranking Problem: some theoretical and algorithmic issues

Posted in Science on July 21, 2008


Large Scale Ranking Problem: some theoretical and algorithmic issues

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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Tags: Science, Lectures, Computer Science, VideoLectures.Net, Web Mining, DCG