摘要: Merging search results is required, for example, where an information retrieval system issues a query to multiple sources and obtains lists. In embodiment engine at Enterprise domain sends the also public Internet engine. embodiments, lists obtained from different are merged using merging model which learnt machine learning process updates when click-through data observed example. examples, user available in used influence improve relevance of results. some modification. able impersonate specified group order promote particular