11. The computer system of claim 10 wherein the training module, for each category, generates an average of the core tensors of documents within that category.
11. The computer system of claim 10 wherein the training module, for each category, generates an average of the core tensors of documents within that category. 12. The computer system of claim 11 wherein the categorization module includes selecting as the category for the document the category whose average core tensor is most similar to the generated core tensor for the document.