5 Slow test failures
traceback: [here](https://github.com/huggingface/transformers/runs/916838508?check_suite_focus=true)

```bash
=========================== short test summary info ============================
FAILED tests/test_modeling_auto.py::AutoModelTest::test_model_for_pretraining_from_pretrained
FAILED tests/test_modeling_auto.py::AutoModelTest::test_model_from_pretrained
FAILED tests/test_modeling_bart.py::BartModelIntegrationTests::test_bart_base_mask_filling
FAILED tests/test_modeling_bart.py::BartModelIntegrationTests::test_bart_large_mask_filling
FAILED tests/test_modeling_common.py::ModelUtilsTest::test_model_from_pretrained
==== 5 failed, 1423 passed, 489 skipped, 384 warnings in 1609.33s (0:26:49) ====
```

I'm investigating
ALL FIXED YEEHAW