Compiles net for fast belief updating (i.e., junction tree propagation).

If the net is an auto-update net (see SetNetAutoUpdate_bn) then belief updating will be done immediately afterwards, but if it isn't, then updating won't be done until you request a belief (e.g., with GetNodeBeliefs_bn).

When the net is compiled, first an "elimination ordering" is determined, which is a list giving all the nodes of the net in some order, and using that list a "junction tree" of cliques is formed. The efficiency of the junction tree may depend greatly on the elimination ordering used, so it is important to find a good elimination ordering. You can determine the elimination ordering used by calling GetNetElimOrder_bn, and you can control it by calling SetNetElimOrder_bn before calling CompileNet_bn.

Calling CompileNet_bn after the net is already compiled has no effect, unless the net or its elimination ordering has been changed, in which case the net will be recompiled.

To find how efficient the compiling was, use SizeCompiledNet_bn, and to get a report on the internal structures created during compiling, use ReportJunctionTree_bn.