Method: Ai4r::Classifiers::ZeroR#build

Defined in:
lib/ai4r/classifiers/zero_r.rb

#build(data_set) ⇒ Object

Build a new ZeroR classifier. You must provide a DataSet instance as parameter. The last attribute of each item is considered as the item class.



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# File 'lib/ai4r/classifiers/zero_r.rb', line 30

def build(data_set)
  data_set.check_not_empty
  @data_set = data_set
  frequence = {}
  max_freq = 0
  @class_value = nil
  @data_set.data_items.each do |example|
    class_value = example.last
    class_frequency = frequence[class_value]
    class_frequency = (class_frequency) ? class_frequency+1 : 1
    if max_freq < class_frequency
      max_freq = class_frequency
      @class_value = class_value
    end
  end
  return self
end