class_docstr: Represents a debugger-decorated graph.
code: def node_devices(self):
      return self._node_devices
  
imports: from tensorflow.core.framework import graph_pb2
  from tensorflow.python.framework import op_def_registry
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 13 for calling the DebugGraph obj's underlying member method code with example usage: obj.node_devices() and returns: self