2. A machine learning system as claimed in claim 1 wherein the at least one store holds the model such that the at least one factor clause is selected from one of: a single relation factor clause, a cross-relation factor clause and a cross entity factor clause.
3. A machine learning system as claimed in claim 2 wherein the at least one factor clause is the single relation factor clause and the single relation factor clause connects the factor node between at least a first probabilistic attribute and at least a second deterministic attribute of a same relation schema.