1. A computer-implemented method for reducing a number of links in a Bayesian network, the method comprising: generating, by a computer, a first modified Bayesian network based on a primary Bayesian network which has a plurality of links, wherein the first modified Bayesian network does not include a first subset of the plurality of links; generating, by the computer, a second modified Bayesian network based on the primary Bayesian network wherein the second modified Bayesian network does not include a second subset of the plurality of links; validating the first modified Bayesian network and the second modified Bayesian network using a data set to generate a first validation result and a second validation result, respectively; and substituting the primary Bayesian network with the first modified Bayesian network or the second modified Bayesian network based on the first validation result and the second validation result.