Module: Hiccup::Inferable::ClassMethods

Defined in:
lib/hiccup/inferable.rb

Instance Method Summary collapse

Instance Method Details

#assert_date!(date) ⇒ Object 



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# File 'lib/hiccup/inferable.rb', line 107

def assert_date!(date)
  return date if date.is_a?(Date)
  date.to_date rescue raise_invalid_dates_error!
end

#extract_array_of_dates!(dates) ⇒ Object 



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# File 'lib/hiccup/inferable.rb', line 102

def extract_array_of_dates!(dates)
  raise_invalid_dates_error! unless dates.respond_to?(:each)
  dates.map { |date| assert_date!(date) }.sort
end

#infer(dates, options = {}) ⇒ Object 



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# File 'lib/hiccup/inferable.rb', line 14

def infer(dates, options={})
  allow_null_schedules = options.fetch(:allow_null_schedules, false)
  verbosity = options.fetch(:verbosity, (options[:verbose] ? 1 : 0)) # 0, 1, or 2
  
  dates = extract_array_of_dates!(dates)
  enumerator = DatesEnumerator.new(dates)
  guesser = Guesser.new(self, {verbose: verbosity >= 2})
  schedules = []
  
  confidences = []
  high_confidence_threshold = 0.6
  min_confidence_threshold  = 0.35
  
  last_confident_schedule = nil
  iterations_since_last_confident_schedule = 0
  
  until enumerator.done?
    date = enumerator.next
    guesser << date
    confidence = guesser.confidence.to_f
    confidences << confidence
    predicted = guesser.predicted?(date)
    
    # if the last two confidences are both below a certain
    # threshhold and both declining, back up to where we
    # started to go wrong and start a new schedule.
    
    confident = !(confidences.length >= 3 && (
                  (confidences[-1] < high_confidence_threshold &&
                   confidences[-2] < high_confidence_threshold &&
                   confidences[-1] < confidences[-2] &&
                   confidences[-2] < confidences[-3]) ||
                  (confidences[-1] < min_confidence_threshold &&
                   confidences[-2] < min_confidence_threshold)))
    
    if predicted && confidence >= min_confidence_threshold
      iterations_since_last_confident_schedule = 0
      last_confident_schedule = guesser.schedule
    else
      iterations_since_last_confident_schedule += 1
    end
    
    rewind_by = iterations_since_last_confident_schedule == guesser.count ? iterations_since_last_confident_schedule - 1 : iterations_since_last_confident_schedule
    
    
    
    if verbosity >= 1
      output = "  #{enumerator.index.to_s.rjust(3)} #{date}"
      output << " #{"[#{guesser.count}]".rjust(5)}  =>  "
      output << "~#{(guesser.confidence.to_f * 100).to_i.to_s.rjust(2, "0")} @ "
      output << guesser.schedule.humanize.ljust(130)
      output << "  :( move back #{rewind_by}" unless confident
      puts output
    end
    
    
    
    unless confident
      
      if last_confident_schedule
        schedules << last_confident_schedule
      elsif allow_null_schedules
        guesser.dates.take(guesser.count - rewind_by).each do |date|
          schedules << self.new(:kind => :never, :start_date => date)
        end
      end
      
      enumerator.rewind_by(rewind_by)
      guesser.restart!
      confidences = []
      iterations_since_last_confident_schedule = 0
      last_confident_schedule = nil
    end
  end
  
  if last_confident_schedule
    schedules << last_confident_schedule
  elsif allow_null_schedules
    guesser.dates.each do |date|
      schedules << self.new(:kind => :never, :start_date => date)
    end
  end
  
  schedules
end

#raise_invalid_dates_error! ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/hiccup/inferable.rb', line 112

def raise_invalid_dates_error!
  raise ArgumentError.new("Inferable.infer expects to receive a collection of dates")
end