code: def remote_run(cmd, instance_name, detach=False, retries=1):
    
    if detach:
      cmd = SCREEN.format(command=cmd)
    args = SSH.format(instance_name=instance_name).split()
    args.append(cmd)
    for i in range(retries + 1):
      try:
        if i > 0:
          tf.logging.info("Retry %d for %s", i, args)
        return sp.check_call(args)
      except sp.CalledProcessError as e:
        if i == retries:
          raise e
docs: Run command on GCS instance, optionally detached.