Relevance feedback has been shown to be very effective at improving relevance of results. Its successful use requires queries for which the set of relevant documents is medium to large. Full relevance feedback is often onerous for the user, and its implementation is not very efficient in most IR systems. In many cases, other types of interactive retrieval may improve relevance by about as much with less work.
Beyond the core ad hoc retrieval scenario, other uses of relevance feedback include:
banana slugand the top three titles returned are:
banana slug Ariolimax columbianusJinxing judges the first two documents relevant, and the third nonrelevant. Assume that Omar's search engine uses term frequency but no length normalization nor IDF. Assume that he is using the Rocchio relevance feedback mechanism, with . Show the final revised query that would be run. (Please list the vector elements in alphabetical order.)
Santa Cruz mountains banana slug
Santa Cruz Campus Mascot