As mentioned in the Bibliographic Notes, Hugin implements an approximation scheme that involves setting very small probabilities in the junction tree tables to zero, which in turns allows more compression to take place.

To turn on the approximation scheme, select Network!Network Properties!

Compilation, then check the approximate optimization box.

As for the previous problem, select an example BN and perform an investigation of the effect of varying the approximation threshold on the belief updating, again using the KL divergence measure.