Causal Mask in BertGeneration
I cannot find the implementation of CausalMask in BertGeneration. Can you help me locate it?
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.<|||||>It's here:
https://github.com/huggingface/transformers/blob/cabcc75171650f9131a4cf31c62e1f102589014e/src/transformers/modeling_utils.py#L243
:-)
Note that `is_decoder` has to be set to True <|||||>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.