code: def __call__(self, *args):
      return ray.get_runtime_context().current_actor
  
imports: import pytest
  import ray
  from ray import serve
  from ray._private.test_utils import wait_for_condition
  from ray.exceptions import RayError
  from ray.serve._private.common import DeploymentStatus
  from ray.serve._private.constants import REPLICA_HEALTH_CHECK_UNHEALTHY_THRESHOLD, SERVE_DEFAULT_APP_NAME
label_desc: Use image node_id 3 for calling the Patient obj's underlying member method code with example usage: obj.__call__() and returns: ray