code: def __enter__(self):
      contexts = [
          chainer.using_config("use_cudnn", self.use_cudnn),
          chainer.using_config(
              "cudnn_deterministic", self.cudnn_deterministic
          ),
          chainer.using_config("autotune", self.autotune),
          chainer.using_config("use_ideep", self.use_ideep),
          chainer.using_device(self.device),
      ]
      for c in contexts:
          c.__enter__()
      self._contexts.append(contexts)
      return self
  
imports: import functools
  import chainer
  from chainer import backend
  from chainer.testing import _bundle
  from chainer.testing import attr
  import chainerx
label_desc: Use image node_id 6 for calling the BackendConfig obj's underlying member method code with example usage: obj.__enter__() and returns: self