82. The method of claim 13 , in which each vector in the set of vectors represents a corresponding query, and each feature of each vector represents a relevance of a corresponding document to the query.
82. The method of claim 13 , in which each vector in the set of vectors represents a corresponding query, and each feature of each vector represents a relevance of a corresponding document to the query. 83. The method of claim 82 , further comprising suggesting a query corresponding to y to a user.