Patent Document ID: 8484245
Application ID: 13022766

Base Claim:
1. A non-transitory storage medium storing instructions executable by a processing device to perform a method comprising: generating a hierarchical classifier for a taxonomy of hierarchically organized categories wherein each category is represented by one or more textual category descriptors, the hierarchical classifier being generated by a method including (i) constructing queries from the textual category descriptors representing the categories and querying a documents database using the constructed queries to retrieve pseudo-relevant documents and (ii) extracting language models comprising multinomial distributions over the words of a textual vocabulary for the categories of the taxonomy by inferring a hierarchical topic model representing the taxonomy from at least the pseudo-relevant documents; and classifying an input document different from the pseudo-relevant documents using the generated hierarchical classifier, the classifying comprising inferring mixture weights for a mixture of the extracted language models to approximate the multinomial distribution of words of the input document over the words of the textual vocabulary.

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Claim 6:
6. The non-transitory storage medium as set forth in claim 1 , wherein the hierarchical topic model comprises a mixture model in which a document is represented as a mixture of the language models of a plurality of categories and their ancestor categories.