A classification task or algorithm is one where the goal is to assign input data into one of two or more classes. In some cases, notably for supervised learning, these classes are preassigned by a human expert or other fixed system. In some form so unsupervised learning classes may be infered by the system using some form of clustering.
Used on Chap. 6: page 126; Chap. 19: pages 465, 472, 473, 474; Chap. 21: pages 519, 525, 526, 530