Fix flaky `SwitchTransformersModelTest::test_training_gradient` (#35587)
* fix
* Update tests/models/switch_transformers/test_modeling_switch_transformers.py
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>
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Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>