tokens: One of the most common approach is to split multiple thread create a cache buffer on each one , do the histogram on the cache buffer and then lock a mutex addition the values on the local to the output vector , and unlock the buffer .
ner_tags: O O O O O O O O O O O O O O B-Data_Structure O O O O O O O O O O B-Data_Structure O O O O O O O O O O O O O O B-Data_Structure O O O O B-Data_Structure O