class_docstr: Represents an actor method invocation in a Ray function DAG.
code: def _get_remote_method(self, method_name):
      method_body = getattr(self._parent_class_node, method_name)
      return method_body
  
imports: from weakref import ReferenceType
  import ray
  from ray.dag.dag_node import DAGNode
  from ray.dag.input_node import InputNode
  from ray.dag.format_utils import get_dag_node_str
  from ray.dag.constants import PARENT_CLASS_NODE_KEY, PREV_CLASS_METHOD_CALL_KEY
  from ray.util.annotations import DeveloperAPI
  from typing import Any, Dict, List, Union, Tuple, Optional
label_desc: Use image node_id 6 for calling the ClassMethodNode obj's underlying member method code with example usage: obj._get_remote_method(method_name) and returns: method_body