code: def __repr__(self):
      lst = []
      for k, _ in self._props:
          lst.append("{}={!r}".format(k, getattr(self, k)))
      return "<BackendConfig {}>".format(" ".join(lst))
  
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 8 for calling the BackendConfig obj's underlying member method code with example usage: obj.__repr__() and returns: str