code: def get_lines(self):
      iteration = self._iterator.current_position
      epoch_detail = self._iterator.epoch_detail
      epoch_size = getattr(self._iterator, "_epoch_size", None)
  
      lines = []
  
      rate = epoch_detail
      marks = "#" * int(rate * self._bar_length)
      lines.append(
          "validation [{}{}] {:6.2%}\n".format(
              marks, "." * (self._bar_length - len(marks)), rate
          )
      )
  
      if epoch_size:
          lines.append(
              "{:10} / {} iterations\n".format(iteration, epoch_size)
          )
      else:
          lines.append("{:10} iterations\n".format(iteration))
  
      speed_t, speed_e = self.update_speed(iteration, epoch_detail)
      estimated_time = (1.0 - epoch_detail) / speed_e
      lines.append(
          "{:10.5g} iters/sec. Estimated time to finish: {}.\n".format(
              speed_t, datetime.timedelta(seconds=estimated_time)
          )
      )
      return lines
  
imports: import copy
  import datetime
  import warnings
  import six
  from chainer import backend
  from chainer import configuration
  from chainer.dataset import convert
  from chainer.dataset import iterator
  from chainer import function
  from chainer import iterators
  from chainer import link
  from chainer import reporter
  from chainer.training import extension
  from chainer.training.extensions import util
  from chainer.utils import argument
label_desc: Use image node_id 2 for calling the _IteratorProgressBar obj's underlying member method code with example usage: obj.get_lines() and returns: lines