Relevance Feedback A process of refining the results of a retrieval using a given query . The user indicates which documents from those returned are most relevant to his query. The system typically tries to find terms common to that subset, and adds them to the old query. It then returns more documents using the revised query. This can be repeated as often as desired.
Robot See spider .
For more information, check their home page . A representation of a collection where documents are hashed to a bit string. This is essentially a compression technique to permit faster searching. The measure of how alike two documents are, or how alike a document and a query are. In a vector space model , this is usually interpreted as how close their corresponding vector representations are to each other.