tokens: I assume you are using the FormData object , in that case you need to append the string values to the FormData object , and pass the object in as the data parameter in jQuery 's $ .ajax .
ner_tags: O O O O O O B-Class O O O O O O O O O O B-Data_Type O O O B-Class O O O O O O O O O B-Variable O O B-Library O B-Function I-Function O