message: CLN: remove the unused import: tf_export
diff: @@ -26,7 +26,6 @@ from tensorflow.python.ops import resource_variable_ops
  from tensorflow.python.ops import state_ops
  from tensorflow.python.training import adam
  from tensorflow.python.training import training_ops
  -from tensorflow.python.util.tf_export import tf_export
  class AdaMaxOptimizer(adam.AdamOptimizer):
  