Method: Evoc::Evaluate.ap

Defined in:

lib/evoc/evaluate.rb

.ap(rec:, exp: nil) ⇒ Object

# File 'lib/evoc/evaluate.rb', line 246

def self.ap(rec:,exp: nil)
  # AP is 0 for the empty list
  if rec.is_a?(Array) && rec.empty? # array and empty
    return nil
  end
  self.validateInput(rec)

  i = 0
  correct_i = 0
  ap = 0

  rec.each do |cluster|
    cluster.each do |item|
      i = i + 1
      correct_i = correct_i + item
      precision_i = correct_i/i
      ap = ap + (precision_i*item) 
    end
  end

  if exp.nil?
    exp = correct_i
  else
    if correct_i > exp
      raise ArgumentError, "Found more relevant items than the provided number of relevant items"
    end
  end
  return (exp == 0 ? 0 : (ap/exp).to_f)

end