3. The method of claim 1 , wherein a description of an instance is computed by defining a virtual class and making the instance the only member of the virtual class.
3. The method of claim 1 , wherein a description of an instance is computed by defining a virtual class and making the instance the only member of the virtual class. 4. The method of claim 3 , wherein information content of the description of the instance is a probability that a random instance belongs to the virtual class.