14. The computer system of claim 10 , wherein at least a portion of the training sets are automatically generated based, at least in part, upon same class negative instances.
14. The computer system of claim 10 , wherein at least a portion of the training sets are automatically generated based, at least in part, upon same class negative instances. 15. The computer system of claim 14 , wherein the same class negative instances are acquired as a random sample of instances extracted by a distributional knowledge extractor of the plurality of knowledge extractors.