code: def __hash__(self):
      if self._hash is None:
          self._hash = hash(self.to_string())
      return self._hash
  
imports: from tensorflow.python.util.tf_export import tf_export
  from tensorflow.python import pywrap_tfe
label_desc: Use image node_id 6 for calling the DeviceSpecV1 obj's underlying member method code with example usage: obj.__hash__() and returns: self