code: def create_extension(self, skip_statistics=False):
      kwargs = {
          "statistics": self.statistics
          if not skip_statistics
          else None,
          "report_params": self.report_params,
          "report_grads": self.report_grads,
          "prefix": self.prefix,
          "skip_nan_params": True,  # avoid warnings when grads are nan
      }
  
      return extensions.ParameterStatistics(self.links, **kwargs)
  
imports: import re
  import time
  import unittest
  import mock
  import six
  import chainer
  from chainer import backend
  from chainer import testing
  from chainer import training
  from chainer.training import extensions
label_desc: Use image node_id 2 for calling the TestParameterStatisticsBase obj's underlying member method code with example usage: obj.create_extension(skip_statistics) and returns: extensions