`preferred_shard` to match the value passed as the `shard` input
of a matching `Save` Op may speed up Restore.  This attribute only affects
performance, not correctness.  The default value -1 means files are processed in
order.

See also `RestoreSlice`.
  }];

  let arguments = (ins
    Arg<TF_StrTensor, [{Must have a single element. The pattern of the files from