5. The method of claim 1 , wherein the query vector is selected from a query distribution that is a Gaussian distribution having a varying covariance structure.
5. The method of claim 1 , wherein the query vector is selected from a query distribution that is a Gaussian distribution having a varying covariance structure. 6. The method of claim 5 , wherein an amount of Gaussian noise is added to the query distribution to reduce an approximation error.