code: def write(self, key, value):
      self.log_output.append(float(value))
  
imports: from __future__ import division, print_function
  import numpy
  import cntk
  from cntk import parameter
  import pytest
  import sys
  import itertools
  from cntk.logging import ProgressPrinter
  from cntk.learners import sgd, learning_rate_schedule, learning_parameter_schedule, UnitType, universal
  from cntk.layers import Dense, Sequential
label_desc: Use image node_id 2 for calling the TestProgressWriter obj's underlying member method code with example usage: obj.write(key, value) without return types