Where is Model2Model PreTrainedEncoderDecoder in run_summerization_finetune
## ❓ Questions & Help

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@yeliu918 was there any ```run_summerization_finetune``` script before? Since I cannot find it now.<|||||>This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
