Deebert Examples test failure
`DeeBertTests.test_glue_deebert`
Excerpt from [CI](https://pipelines.actions.githubusercontent.com/SFFqAjp6ciVZiZmfZfjie9y9Q96dfpUE8sJvWAtTDWoFlixGkf/_apis/pipelines/1/runs/4783/signedlogcontent/3?urlExpires=2020-07-23T20%3A02%3A20.7871420Z&urlSigningMethod=HMACV1&urlSignature=XL%2Fj%2F2NSBD3Q174ifxC4jTOQUloQMx3UFZ%2ByaM%2Beomk%3D)

```python
2020-07-23T00:30:23.1537872Z         with patch.object(sys, "argv", train_args):
2020-07-23T00:30:23.1538109Z             result = run_glue_deebert.main()
2020-07-23T00:30:23.1538324Z             for value in result.values():
2020-07-23T00:30:23.1538573Z >               self.assertGreaterEqual(value, 0.75)
2020-07-23T00:30:23.1538856Z E               AssertionError: 0.6666666666666666 not greater than or equal to 0.75
2020-07-23T00:30:23.1539030Z 
```


@Ji-Xin would you mind taking a stab at this?
Command:
```bash
RUN_SLOW=1 pytest examples/deebert/ 
```