code: def __init__(self):
      self.value = None
  
imports: import pickle
  import unittest
  import numpy
  import six
  import chainer
  from chainer import functions
  from chainer import optimizers
  from chainer import testing
label_desc: Use image node_id 1 to create a new WeightSaveHook object from inherited base classes: object with example: obj = WeightSaveHook()