•"Ab initio" (unsupervised) topic
discovery/structuring
•Useful when you must organize resources but:
–You lack an ontology
–You have specialized/nuanced collections
–There is no training set available
•Developed by Aaron Krowne, Steve Ingram
•Our system based on recent NMF algorithm
•Flat and two hierarchical methods
•Depends on Sparselib++
•Also developed support tools:
–Phrase finder
–Vectorizer
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