message: Remove unused math_ops import to pass CI test
diff: @@ -23,7 +23,6 @@ from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors_impl
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import check_ops
  -from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
  