tokens: The FileField ( docs ) will automatically upload and save the file to the model along with giving you various bit of additional functionality such as where to upload to , getting the absolute url for the file and the ability to delete the file from the model object .
ner_tags: O B-Class O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O