2. The system of claim 1 , wherein the first plurality of categories includes categories within a tree of categories.
2. The system of claim 1 , wherein the first plurality of categories includes categories within a tree of categories. 3. The system of claim 2 , wherein the category identification module is further configured to modify the first plurality of categories, based on the entropy value in excess of a minimum threshold, to generate the second plurality of categories by replacement of at least one category of the first plurality of categories with a parent of the at least one category in the tree of categories.