Class: Ariel::LabeledDocumentLoader

Inherits:
Object
  • Object
show all
Defined in:
lib/ariel/labeled_document_loader.rb

Overview

Provides methods that read an example document, using a Node::Structure tree to populate a tree of Nodes with each labeled example.

Class Method Summary collapse

Class Method Details

.supervise_learning(structure, *labeled_strings) ⇒ Object

As its first argument it takes a root Node::Structure to which any learnt rules will be added. The following arguments are strings containing labeled examples for members of the passed Node::Structure tree. Ariel#learn is the preferred interface for rule-learning - this one may change.

Raises:

  • (ArgumentError) 


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# File 'lib/ariel/labeled_document_loader.rb', line 14

def supervise_learning(structure, *labeled_strings)
  raise ArgumentError, "No labeled strings were given" if labeled_strings.size==0
  loaded_example_hash=process_labeled_strings(structure, *labeled_strings)
  loaded_example_hash.each_pair do |structure_node, example_nodes| 
    if structure_node.node_type==:list_item
      exhaustive=true
    else
      exhaustive=false
    end
    examples = collect_labeled_tokenstreams(example_nodes, :start)
    Log.info "Learning #{"exhaustive " if exhaustive}rules for node #{structure_node.node_name} with #{example_nodes.size} examples"
    learner = Learner.new(*examples)
    start_rules = learner.learn_rule :forward, exhaustive
    Log.info "Learnt start rules #{start_rules.inspect}"
    examples = collect_labeled_tokenstreams(example_nodes, :end)
    learner = Learner.new(*examples)
    end_rules = learner.learn_rule :back, exhaustive
    Log.info "Learnt end rules, #{end_rules.inspect}"
    structure_node.ruleset=RuleSet.new(start_rules, end_rules)
  end
  return structure
end