code: def map_token(self, token):
      if token[1] == "B_W":
          return " " + token[0]
      if token[1] == "I_W":
          return "_" + token[0]
      else:
          return " " + token[0]
  
file_path: underthesea/underthesea/corpus/ws_corpus.py
imports: import io
  from underthesea.corpus import Document, UnicodeTransformer, Corpus
  from os import listdir, mkdir
  from os.path import join
  from underthesea.util.file_io import write
label_desc: Use image node_id 2 for calling the WSCorpus obj's underlying member method code with example usage: obj.map_token(token) and returns: unknown, unknown, unknown