message: [tf.data] Fix flaky test data/experimental/kernel_tests:group_by_reducer_test.
diff: @@ -195,6 +195,7 @@ tf_py_test(
  name = "group_by_reducer_test",
  size = "small",
  srcs = ["group_by_reducer_test.py"],
  + shard_count = 12,
  deps = [
  "//tensorflow/python:array_ops",
  "//tensorflow/python:client_testlib",
  