message: fix default arg
diff: @@ -28,7 +28,7 @@ import sys
  BUCKET_NAME = os.environ['BUCKET_NAME']
  -def loop(working_dir='estimator_working_dir', tpu_name):
  +def loop(working_dir='estimator_working_dir', tpu_name=None):
  """Run train and validate as subprocesses."""
  flags = [
  working_dir,
  