Self-organizing maps. 2nd ed. (English) Zbl 0866.68085

Springer Series in Information Sciences. 30. Berlin: Springer. xvii, 426 p. (1997).
The second, revised edition of this book was suggested by the impressive sales of the first edition. Fortunately this enabled us to incorporate new important results that had just been obtained.
The ASSOM (Adaptive-Subspace SOM) is a new architecture in which invariant-feature detectors emerge in an unsupervised learning process. Its basic principle was already introduced in the first edition, but the motivation and theoretical discussion in the second edition is more thorough and consequent. New material has been added to Sect. 5.9 and this section has been rewritten totally. Correspondingly, Sect. 1.4, which deals with adaptive-subspace classifiers in general and constitutes the prerequisite for the ASSOM principle, has also been extended and rewritten totally.
Another new SOM development is the WEBSOM, a two-layer architecture intended for the organization of very large collections of full-text documents such as those found in the Internet and World Wide Web. This architecture was published after the first edition came out. The idea and results seemed to be so important that the new Sect. 7.8 has now been added to the second edition.
Another addition that contains new results is Sect. 3.15, which describes the acceleration in the computing of very large SOMs.
It was also felt that Chap. 7, which deals with SOM applications, had to be extended.
To recapitulate, Chaps. 1, 3, 5, 7, and 9 contain extensive additions and revisions, whereas Chaps. 2, 4, 6, 8, and 10 are identical with those of the first edition, except for a few minor corrections to their text.


68T05 Learning and adaptive systems in artificial intelligence
68-02 Research exposition (monographs, survey articles) pertaining to computer science