Upstream a number of changes to git.

Changes:
- Updates to README / os_setup for common installation issues
  by ebrevdo, vrv, wicke, anelia, dga

- Add a test for backwards compatibility checks by Josh

- Simplifications to tiling/padding of scalars by bsteiner

- Improve listing of devices when no devices are known by Matthieu

Base CL: 107607137

1 files changed, 9 insertions, 0 deletions

diff --git a/tensorflow/core/kernels/pad_op.h b/tensorflow/core/kernels/pad_op.h
index c4f8a4abda..204a2a13a4 100644
--- a/tensorflow/core/kernels/pad_op.h
+++ b/tensorflow/core/kernels/pad_op.h
@@ -21,6 +21,15 @@ struct Pad {
   }
 };
 
+template <typename Device, typename T>
+struct Pad<Device, T, 0> {
+  // In the scalar case we simply copy the input.
+  void operator()(const Device& d, typename TTypes<T, 0>::Tensor output,
+                  typename TTypes<T, 0>::ConstTensor input,
+                  Eigen::array<std::pair<int32, int32>, 0>) {
+    output.device(d) = input;
+  }
+};
 }  // namespace functor
 }  // namespace tensorflow