code: def stream_output(self, stream):
      self._wait_cond.acquire()
      try:
          # Fail if command does not capture this stream
          if stream is None:
              return CommandOutputNotCaptured()
          return network.AckStreamResponse(), stream
      finally:
          self._wait_cond.release()
  
imports: import abc
  import threading
  from horovod.runner.common import util
  from horovod.runner.common.util import network, safe_shell_exec, timeout
  from horovod.runner.util.streams import Pipe
  from horovod.runner.util.threads import in_thread
label_desc: Use image node_id 11 for calling the BasicTaskService obj's underlying member method code with example usage: obj.stream_output(stream) and returns: network,  stream, CommandOutputNotCaptured