SLOW GPU test Failures
```bash
=========================== short test summary info ============================
FAILED tests/test_modeling_marian.py::TestMarian_RU_FR::test_batch_generation_ru_fr
FAILED tests/test_modeling_marian.py::TestMarian_MT_EN::test_batch_generation_mt_en
==== 2 failed, 1110 passed, 392 skipped, 361 warnings in 1347.28s (0:22:27) ====
```

https://github.com/huggingface/transformers/runs/782480196?check_suite_focus=true
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