Concept-based categorization of unstructured objects

1. A computer-based method of associating an unstructured object with a category, comprising:

receiving an unstructured object, the unstructured object being associated with at least one concept;

calculating an inverted category ratio and a concept ratio for each concept associated with the unstructured object, the inverted category ratio for a concept being exp(−Nci/Nc), Nc being the number of categories in the plurality of categories and Nci being the number of categories in which that concept occurs; the concept ratio for a concept being the ratio of the number of times that concept occurs in the unstructured object over the total number of concepts that occur in the unstructured object;

calculating a category normalization ratio for each category in a plurality of categories;

associating the unstructured object with at least one category in the plurality of categories based on the inverted category ratio, the concept ratio, and the category normalization ratio; and

outputting, to a user display, information showing the correspondence between the unstructured object and the at least one category.

2. The method of claim 1 , wherein the category normalization ratio for a category is the ratio of the total number of concepts that occur in both the category and the unstructured object over the total number of concepts in the category.

3. A system for associating an unstructured object with a category, comprising:

a processor; and

a memory in communication with the processor, the memory storing a plurality of processing instructions for directing the processor to:

receive an unstructured object, the unstructured object being associated with at least one concept;

calculate an inverted category ratio and a concept ratio for each concept associated with the unstructured object, the inverted category ratio for a concept being exp(−Nci/Nc), Nc being the number of categories in the plurality of categories and Nci being the number of categories in which that concept occurs; the concept ratio for a concept being the ratio of the number of times that concept occurs in the unstructured object over the total number of concepts that occur in the unstructured object;

calculate a category normalization ratio for each category in a plurality of categories; and

associate the unstructured object with at least one category in the plurality of categories based on the inverted category ratio, the concept ratio, and the category normalization ratio.

4. The system of claim 3 , wherein the category normalization ratio for a category is the ratio of the total number of concepts that occur in both the category and the unstructured object over the total number of concepts in that category.