message: Remove unused import. Fix pylint.
diff: @@ -24,7 +24,6 @@ from tensorflow.compiler.tests import xla_test
  from tensorflow.contrib.opt.python.training import addsign
  from tensorflow.contrib.opt.python.training import sign_decay
  from tensorflow.python.framework import constant_op
  -from tensorflow.python.framework import dtypes
  from tensorflow.python.ops import resource_variable_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
  