* Add Luke training
* Fix true label tags
* Fix true label tags
* Fix true label tags
* Update the data collator for Luke
* Some training refactor for Luke
* Improve data collator for Luke
* Fix import
* Fix datasets concatenation
* Add the --max_entity_length argument for Luke models
* Remove unused code
* Fix style issues
* Fix style issues
* Move the Luke training into a separate folder
* Fix style
* Fix naming
* Fix filtering
* Fix filtering
* Fix filter
* Update some preprocessing
* Move luke to research_projects
* Checkstyle
* Address comments
* Fix style