4. The method of claim 1 , wherein determining the relevance formula comprises utilizing the previously stored user input to update the relevance formula and modify at least one of the coefficients.
4. The method of claim 1 , wherein determining the relevance formula comprises utilizing the previously stored user input to update the relevance formula and modify at least one of the coefficients. 6. The method of claim 4 , wherein: the relevance formula corresponds to a user model and a group model; the user model is for determining a relevance score of the document and the search query for a user; and the group model is for determining a relevance score of the document and the search query for a group of users.