class_docstr: Represents a function node decorated by @serve.deployment in a serve DAG.
code: def get_deployment_name(self):
      return self._deployment_name
  
file_path: ray/python/ray/serve/_private/deployment_function_node.py
imports: from typing import Any, Callable, Dict, List, Union
  from ray.dag.dag_node import DAGNode
  from ray.dag.format_utils import get_dag_node_str
  from ray.serve._private.config import DeploymentConfig, ReplicaConfig
  from ray.serve._private.constants import RAY_SERVE_ENABLE_NEW_HANDLE_API
  from ray.serve.deployment import Deployment, schema_to_deployment
  from ray.serve.handle import DeploymentHandle, RayServeHandle
  from ray.serve.schema import DeploymentSchema
label_desc: Use image node_id 4 for calling the DeploymentFunctionNode obj's underlying member method code with example usage: obj.get_deployment_name() and returns: self