code: def __str__(self):
      return "Autograd {0} with value {1}".format(
          type(self).__name__, str(self._value)
      )
  
imports: import warnings
  from contextlib import contextmanager
  from collections import defaultdict
  from .util import subvals, toposort
  from .wrap_util import wraps
label_desc: Use image node_id 3 for calling the Box obj's underlying member method code with example usage: obj.__str__() and returns: str