Ranking
Ranking is widely used in computer systems. Any application that returns a rank ordered set of results to a user is performing some type of ranking operation. Therefore, learning to rank can be a key component for a number of different applications. In most systems, the utility function typically used to assess the quality of a ranking algorithm are very hard to optimize directly. This is in part due to the fact that the utility function depends on the sorted order of the URLs (for a given query) and not directly on the scores, or labels, for the query.
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