the shape of trainer.predict().predictions is inconsistent with the input dataset
when I run under the debug mode, the length of dataset is 500, but the length of prediction is 498, I can't find the causes....
This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.