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Re: JanusGraph combined with Belief Propagation
You can first try to write a custom VertexProgram for belief propagation with Apache TinkerPop. A custom VertexProgram supports the massive message parsing needed for belief propagation.
If it works on TinkerPop you can use the same VertexProgram on JanusGraph (if a single TinkerPop machine does not suffice to hold your graph), but you will have the additional complexity of getting JanusGraph to work with Apache Spark.
A Google search on belief propagation VertexProgram TinkerPop does not give any relevant results.
Best wishes, Marc