tokens: It seems better to create a global instance of the Class , and have one copy of headless Chrome running the whole time , rather than starting Chrome , connecting to it , getting the PDF data , and then closing everything every time .
ner_tags: O O O O O O B-Data_Type O O O O O O O O O O B-Application I-Application O O O O O O O O B-Application O O O O O O O B-File_Type O O O O O O O O O