Active Mining by Hiroshi Motoda

Machine Theory

By Hiroshi Motoda

The necessity for accumulating proper information assets, mining worthwhile wisdom from various kinds of facts assets and briskly reacting to state of affairs swap is ever expanding. energetic mining is a suite of actions each one fixing part of this desire, yet jointly attaining the mining goal during the spiral impact of those interleaving 3 steps. This booklet is a joint attempt from prime and energetic researchers in Japan with a subject matter approximately lively mining and a well timed record at the vanguard of information assortment, user-centered mining and person interaction/reaction. It deals a latest review of contemporary ideas with real-world functions, stocks hard-learned stories, and sheds mild on destiny improvement of energetic mining.

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Else 14:- Initialize S and rule. 15: • Add l1 to S, and initialize / 1. 16: else 17:- Select lmnx having the maximum G. 18: if the body of the rule is empty, then I 1 := 19: • Add llnal to rule, and S. 2 Learning algorithm Figure 3 shows the learning algorithm for making filtering rules. This algorithm is based on the first order learning system FOIL [7] which adopts a greedy separate-and-conquer strategy [3]. This algorithm generates a filtering rule one by one, and adds the generated rule to R.

5. Yamada and Y. Nakai / Monitoring Partial Update of Web Pages 46

location | tomorrow tokyo rainy today Figure 4: A HTML tree. 1 Training examples for region identification A training example for RI is described with the following attributes. (tagl,tag2, tag3, • • •, cNo, rNo, data, clndex, rIndex, class) tagl,tag2,tag3,... are a sequence of ancestors of an indicated region in a HTML tree (Fig. 4). A value of a tag attribute is order of the tag when the other same tags are in the same depth, data is a set of tag's src.

Understandability: how easily the topic- of a cluster can be understood by users. The sets of documents used for the experiments are collected from the following online news sites. Setl Documents in entertainment category of Yahoo! Japan News site4 . released on September 18, 2001. The 75 keywords are extracted from 25 documents. Set2 Documents in entertainment category of Yahoo! Japan News site, released on September 21, 2001. The 62 keywords are extracted from 24 documents Set3 Documents in local news category of Lycos Japan5 .

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