-categories are subjects, topics or concepts -goal: find associated category for document -supervised training builds model relating input term frequencies to class (decision tree, neural net)
categories are subjects, topics, or concepts. find associates category for document. supervised training builds model relating input term frequencies to class.
The attack on the Rashid Hotel on Sunday , during the visit of the deputy secretary of defense , Paul D. Wolfowitz , underscores the nature of the problem .