Class: Chainer::Training::Extensions::ProgressBar

Inherits:
Chainer::Training::Extension show all
Defined in:
lib/chainer/training/extensions/progress_bar.rb

Constant Summary

Constants inherited from Chainer::Training::Extension

Chainer::Training::Extension::PRIORITY_EDITOR, Chainer::Training::Extension::PRIORITY_READER, Chainer::Training::Extension::PRIORITY_WRITER

Instance Attribute Summary

Attributes inherited from Chainer::Training::Extension

#name, #priority, #trigger

Instance Method Summary collapse

Methods inherited from Chainer::Training::Extension

#default_name

Constructor Details

#initialize(training_length: nil, update_interval: 100, bar_length: 50, out: STDOUT) ⇒ ProgressBar

Returns a new instance of ProgressBar.



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# File 'lib/chainer/training/extensions/progress_bar.rb', line 8

def initialize(training_length: nil, update_interval: 100,  bar_length: 50, out: STDOUT)
  @training_length = training_length
  @status_template = nil
  @update_interval = update_interval
  @bar_length = bar_length
  @out = out
  @out.sync = true
  @recent_timing = []
end

Instance Method Details

#call(trainer) ⇒ Object 



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# File 'lib/chainer/training/extensions/progress_bar.rb', line 18

def call(trainer)
  if @training_length.nil?
    t = trainer.stop_trigger
    raise TypeError, "cannot retrieve the training length #{t.class}" unless t.is_a?(Chainer::Training::Triggers::IntervalTrigger)
    @training_length = [t.period, t.unit]
  end

  if @status_template.nil?
    @status_template = ERB.new("<%= sprintf('%10d', self.iteration) %> iter, <%= self.epoch %> epoch / #{@training_length[0]} #{@training_length[1]}s\n")
  end

  length, unit = @training_length
  iteration = trainer.updater.iteration

  # print the progress bar according to interval
  return unless iteration % @update_interval == 0

  epoch = trainer.updater.epoch_detail
  now = Time.now.to_f

  @recent_timing << [iteration, epoch, now]
  @out.write("\033[J")

  if unit == 'iteration'
    rate = iteration.to_f / length
  else
    rate = epoch.to_f / length
  end

  marks = '#' * (rate * @bar_length).to_i
  @out.write(sprintf("     total [%s%s] %6.2f%\n", marks, '.' * (@bar_length - marks.size), rate * 100))

  epoch_rate = epoch - epoch.to_i
  marks = '#' * (epoch_rate * @bar_length).to_i
  @out.write(sprintf("this epoch [%s%s] %6.2f%\n", marks, '.' * (@bar_length - marks.size), epoch_rate * 100))

  status = @status_template.result(trainer.updater.bind)
  @out.write(status)

  old_t, old_e, old_sec = @recent_timing[0]
  span = now - old_sec

  if span.zero?
    speed_t = Float::INFINITY
    speed_e = Float::INFINITY
  else
    speed_t = (iteration - old_t) / span
    speed_e = (epoch - old_e) / span
  end

  if unit == 'iteration'
    estimated_time = (length - iteration) / speed_t
  else
    estimated_time = (length - epoch) / speed_e
  end

  @out.write(sprintf("%10.5g iters/sec. Estimated time to finish: %s.\n", speed_t, (Time.parse("1991/01/01") + (estimated_time)).strftime("%H:%m:%S")))

  # move the cursor to the head of the progress bar
  @out.write("\033[4A") # TODO: Support Windows
  @out.flush

  @recent_timing.delete_at(0) if @recent_timing.size > 100
end

#finalize ⇒ Object 



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# File 'lib/chainer/training/extensions/progress_bar.rb', line 83

def finalize
  @out.write("\033[J") # TODO: Support Windows
  @out.flush
end