1AI::Categorizer::LearneUrs:e:rDeCcoinstiroinbTurteeedA(I3P:)e:rClatDeogcourmieznetra:t:iLoenarner::DecisionTree(3)
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NAME

6       AI::Categorizer::Learner::DecisionTree - Decision Tree Learner
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SYNOPSIS

9         use AI::Categorizer::Learner::DecisionTree;
10
11         # Here $k is an AI::Categorizer::KnowledgeSet object
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13         my $l = new AI::Categorizer::Learner::DecisionTree(...parameters...);
14         $l->train(knowledge_set => $k);
15         $l->save_state('filename');
16
17         ... time passes ...
18
19         $l = AI::Categorizer::Learner->restore_state('filename');
20         while (my $document = ... ) {  # An AI::Categorizer::Document object
21           my $hypothesis = $l->categorize($document);
22           print "Best assigned category: ", $hypothesis->best_category, "\n";
23         }
24

DESCRIPTION

26       This class implements a Decision Tree machine learner, using
27       "AI::DecisionTree" to do the internal work.
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METHODS

30       This class inherits from the "AI::Categorizer::Learner" class, so all
31       of its methods are available unless explicitly mentioned here.
32
33   new()
34       Creates a new DecisionTree Learner and returns it.
35
36   train(knowledge_set => $k)
37       Trains the categorizer.  This prepares it for later use in categorizing
38       documents.  The "knowledge_set" parameter must provide an object of the
39       class "AI::Categorizer::KnowledgeSet" (or a subclass thereof),
40       populated with lots of documents and categories.  See
41       AI::Categorizer::KnowledgeSet for the details of how to create such an
42       object.
43
44   categorize($document)
45       Returns an "AI::Categorizer::Hypothesis" object representing the
46       categorizer's "best guess" about which categories the given document
47       should be assigned to.  See AI::Categorizer::Hypothesis for more
48       details on how to use this object.
49
50   save_state($path)
51       Saves the categorizer for later use.  This method is inherited from
52       "AI::Categorizer::Storable".
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AUTHOR

55       Ken Williams, ken@mathforum.org
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58       Copyright 2000-2003 Ken Williams.  All rights reserved.
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60       This library is free software; you can redistribute it and/or modify it
61       under the same terms as Perl itself.
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SEE ALSO

64       AI::Categorizer(3)
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68perl v5.30.0                      2019A-I0:7:-C2a6tegorizer::Learner::DecisionTree(3)
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