Abstract: A search system that is configured to generate personalized ranked lists of search results for end users is disclosed. The search system provides backend search services to several websites of different organizations, where the websites are configured to offer goods for acquisition to the end users. The search system is configured to construct profiles for users that interact with webpages of the websites, and is further configured to construct personalized re-rankers based upon such profiles.

Abstract: A search system that is configured to generate personalized ranked lists of search results for end users is disclosed. The search system provides backend search services to several websites of different organizations, where the websites are configured to offer goods for acquisition to the end users. The search system is configured to construct profiles for users that interact with webpages of the websites, and is further configured to construct personalized re-rankers based upon such profiles.

Abstract: A search system is described herein. The search system is configured to search over several different catalogs, where each catalog includes entries that represent goods and/or services offered for acquisition by companies. The search system receives a query and outputs search results from a catalog based upon the query. The search system includes a general-purpose ranker that is configured to receive the search results and rank the search results, thereby generating a ranked list of search results. The general-purpose ranker is used to rank the search results regardless of the catalog from which the search results were retrieved. The search system further includes a re-ranker that is customized for the catalog, wherein the re-ranker receives the ranked list of search results and re-ranks such search results, thereby generating a second ranked list of search results.