1. A method comprising the following computer-executable acts: receiving first that that is indicative of an identity of a user; and responsive to receiving the first data, using a processor to selectively modify a relational model, wherein the relational model comprises atoms and relationships between atoms.
5. The method of claim 1 , wherein using the processor to selectively modify the relational model comprises: performing inference over a first atom in the relational model to determine a probability corresponding to the first atom in the relational model; and assigning the probability corresponding to the first atom in the relational model to a second atom in the relational model without performing inference over the second atom of the relational model.