User Lenses { Achieving 100 % Precisionon Frequently
The concept of a \user lens" is introduced. The lens is a sequence of linear transformations used to reweight document or query vectors , and is trained automatically via relevance data provided by the user. Experiments verify that in the adhoc task the lens can improve performance on training data while not degrading test data performance, and that larger lenses result in nearly perfect performance on the training set. The lens provides a mechanism for automatically capturing long-term, user-speciic information about an improved weighting scheme.