message: remove unused sparse_ops import
diff: @@ -27,7 +27,6 @@ from tensorflow.python.ops import gen_nn_ops
  from tensorflow.python.ops import gradients_impl
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_ops
  -from tensorflow.python.ops import sparse_ops
  @ops.RegisterGradient("Conv2DBackpropInput")
  