message: Remove broken test that computed gradients of fused batch norm in inference
  mode.
diff: @@ -927,7 +927,10 @@ class NNTest(PForTest):
  outputs[1] = constant_op.constant(0.)
  outputs[2] = constant_op.constant(0.)
  loss = nn.l2_loss(outputs[0])
  + if is_training:
  gradients = g.gradient(loss, [x1, scale, offset])
  + else:
  + gradients = [constant_op.constant(0.)] * 3
  return outputs + gradients
  # pylint: enable=cell-var-from-loop
  