code: def main(unused_argv):
      channel_creds = grpc.local_channel_credentials()
      with grpc.secure_channel(FLAGS.server, channel_creds) as channel:
          grpc.channel_ready_future(channel).result()
          stub = service_pb2_grpc.KubernetesOrchestratorStub(channel)
          request = service_pb2.EchoRequest(msg=FLAGS.msg)
          return _echo_message(stub, request)
  
imports: from absl import app
  from absl import flags
  import grpc
  from tfx.orchestration.experimental.centralized_kubernetes_orchestrator.service.proto import service_pb2
  from tfx.orchestration.experimental.centralized_kubernetes_orchestrator.service.proto import service_pb2_grpc
label_desc: Use image node_id 2 for calling a global function with example usage: main(unused_argv) and returns: _echo_message