Patent ID: 7457801
Filing Date: 2008-11-25
Classification: G06F,G06N,Y10S

Abstract:
1. A method for generating a feature from a hierarchy of documents, the method comprising: providing a hierarchical organization of the documents; generating a feature for each of the documents in the hierarchy; and generating an aggregate feature from the generated features of the documents to represent the feature for the hierarchy of documents wherein the hierarchical organization specifies ancestor/descendent relations between documents and the feature for a document is an aggregate of the features of the document and its descendent documents; and wherein the feature for a document with child documents is aggregated according to the following equation: where F′(p k ) represents the aggregated feature for document p k at level k of the hierarchy, F(p k ) represents the feature for document p k itself, CHILD(p k ) represents the set of child documents of p k , | | represents the number of documents in a set, and α represents the weighting factor when aggregating features of child documents.