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

  use AI::Categorizer::Learner::DecisionTree;

  # Here $k is an AI::Categorizer::KnowledgeSet object

  my $l = new AI::Categorizer::Learner::DecisionTree(...parameters...);
  $l->train(knowledge_set => $k);
  $l->save_state('filename');

  ... time passes ...

  $l = AI::Categorizer::Learner->restore_state('filename');
  while (my $document = ... ) {  # An AI::Categorizer::Document object
    my $hypothesis = $l->categorize($document);
    print "Best assigned category: ", $hypothesis->best_category, "\n";
  }

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

This class inherits from the AI::Categorizer::Learner class, so all of its methods are available unless explicitly mentioned here.

Creates a new DecisionTree Learner and returns it.

Trains the categorizer. This prepares it for later use in categorizing documents. The knowledge_set parameter must provide an object of the class AI::Categorizer::KnowledgeSet (or a subclass thereof), populated with lots of documents and categories. See AI::Categorizer::KnowledgeSet for the details of how to create such an object.

Returns an AI::Categorizer::Hypothesis object representing the categorizer's "best guess" about which categories the given document should be assigned to. See AI::Categorizer::Hypothesis for more details on how to use this object.

Saves the categorizer for later use. This method is inherited from AI::Categorizer::Storable.

Ken Williams, ken@mathforum.org

Copyright 2000-2003 Ken Williams. All rights reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AI::Categorizer(3)