We showed experimentally that the following criteria are not necessary for the succesfull application of loopy prop. We have conducted preliminary investigations into why it sometimes oscillates. It depends on the parameter values, not just network size. We have conducted preliminary experiments on preventing oscillations. If we replace the sum operator with max, loopy prop.
Pearl calls the sum-product algorithm belief updating.
Pearl calls this belief revision. If loopy prop. The loopy means are related to the exact means as follows. The loopy variances are related to the exact variances as follows.