message: Describe what happens on case of duplicate indices on scatter_nd.
diff: @@ -32,8 +32,12 @@ slices within a tensor (initially zero for numeric, empty for string) of
  the given `shape` according to indices. This operator is the inverse of the
  @{tf.gather_nd} operator which extracts values or slices from a given tensor.
  +If `indices` contains duplicates, then their updates are accumulated (summed).
  +
  **WARNING**: The order in which updates are applied is nondeterministic, so the
  -output will be nondeterministic if `indices` contains duplicates.
  +output will be nondeterministic if `indices` contains duplicates -- because
  +of some numerical approximation issues, numbers summed in different order
  +may yield different results.
  `indices` is an integer tensor containing indices into a new tensor of shape
  `shape`. The last dimension of `indices` can be at most the rank of `shape`:
  