code: def __init__(self, contexts):
      self.contexts = contexts
  
imports: from __future__ import absolute_import
  import warnings
  import weakref
  import six
  import chainer
  from chainer import backend
  from chainer.backends import cuda
  from chainer import configuration
  from chainer.function_hook import FunctionHook
  from chainer import function_node
  from chainer import variable
  import chainerx
label_desc: Use image node_id 1 to create a new _BackpropModeContext object from inherited base classes: object with example: obj = _BackpropModeContext(contexts)