message: Disable mnist_train_test
  This test has various flakiness issues and is very long.
diff: @@ -68,6 +68,7 @@ distribute_py_test(
  tags = [
  "no_cuda_asan", # b/173431253
  "no_oss",
  + "notap", # b/173661843
  "notsan", # b/173246447
  ],
  xla_enable_strict_auto_jit = False, # b/173254861
  