code: def epoch_detail(self):
      # Floating point version of epoch.
      return self.iteration * self.batch_size / len(self.dataset)
  
imports: from __future__ import division
  import argparse
  import sys
  import numpy
  import chainer
  import chainer.functions
  import chainer.links
  from chainer import training
  from chainer.training import extensions
  import chainerx
label_desc: Use image node_id 4 for calling the ParallelSequentialIterator obj's underlying member method code with example usage: obj.epoch_detail() and returns: unknown