6. The method of claim 4 , further comprising: testing the relevance function having the determined values for the one or more coefficients.
6. The method of claim 4 , further comprising: testing the relevance function having the determined values for the one or more coefficients. 8. The method of claim 6 , further comprising: enabling the relevance function to be used to rank documents returned by queries if the relevance function satisfies said testing.