message: Delete duplicate ModeKeys
diff: @@ -37,21 +37,6 @@ class KerasModeKeys(object):
  PREDICT = 'predict'
  -class ModeKeys(object):
  - """Standard names for model modes.
  -
  - The following standard keys are defined:
  -
  - * `TRAIN`: training/fitting mode.
  - * `TEST`: testing/evaluation mode.
  - * `PREDICT`: prediction/inference mode.
  - """
  -
  - TRAIN = 'train'
  - TEST = 'test'
  - PREDICT = 'predict'
  -
  -
  # TODO(kathywu): Remove copy in Estimator after nightlies
  class EstimatorModeKeys(object):
  """Standard names for Estimator model modes.
  