Class: Brill::Tagger

Inherits:
Object
  • Object
show all
Defined in:
lib/brill/tagger.rb

Instance Method Summary collapse

Constructor Details

#initialize(lexicon, lexical_rules, contextual_rules) ⇒ Tagger

Returns a new instance of Tagger.



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# File 'lib/brill/tagger.rb', line 5

def initialize( lexicon, lexical_rules, contextual_rules )
  @tagger = ::Tagger::BrillTagger.new
  Brill::Tagger.load_lexicon(@tagger,lexicon)
  Brill::Tagger.load_lexical_rules(@tagger,lexical_rules)
  Brill::Tagger.load_contextual_rules(@tagger,contextual_rules)
end

Instance Method Details

#tag(text) ⇒ Object

Tag a body of text returns an array like [[token,tag],…[token,tag]]



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# File 'lib/brill/tagger.rb', line 15

def tag( text )
  tokens = Brill::Tagger.tokenize( text )
  tags = Brill::Tagger.tag_start( tokens )

  @tagger.apply_lexical_rules( tokens, tags, [], 0 )
  @tagger.default_tag_finish( tokens, tags )
 
  # Brill uses these fake "STAART" tags to delimit the start & end of sentence.
  tokens << "STAART" 
  tokens << "STAART" 
  tokens.unshift "STAART"
  tokens.unshift "STAART"
  tags << "STAART" 
  tags << "STAART" 
  tags.unshift "STAART"
  tags.unshift "STAART"

  @tagger.apply_contextual_rules( tokens, tags, 1 )

  tags.shift
  tags.shift
  tokens.shift
  tokens.shift
  tags.pop
  tags.pop
  tokens.pop
  tokens.pop

  pairs = []
  tokens.each_with_index do|t,i|
    pairs << [t,tags[i]]
  end
  pairs
end