code: def word2features(self, s):
      features = []
      for i, token in enumerate(s):
          tmp = []
          for template in self.templates:
              index1, index2, column, func, token_syntax = template
              prefix = "%s=" % token_syntax
  
              if i + index1 < 0:
                  result = "%sBOS" % prefix
                  tmp.append(result)
                  continue
              if i + index1 >= len(s):
                  result = "%sEOS" % prefix
                  tmp.append(result)
                  continue
              if index2 is not None:
                  if i + index2 >= len(s):
                      result = "%sEOS" % prefix
                      tmp.append(result)
                      continue
                  tokens = [
                      s[j][column]
                      for j in range(i + index1, i + index2 + 1)
                  ]
                  word = " ".join(tokens)
              else:
                  try:
                      word = s[i + index1][column]
                  except Exception:
                      pass
              if func is not None:
                  result = functions[func](word)
              else:
                  result = word
              result = "%s%s" % (prefix, result)
              tmp.append(result)
          features.append(tmp)
      return features
  
file_path: underthesea/underthesea/transformer/tagged.py
imports: import re
  from underthesea.transformer.tagged_feature import functions
label_desc: Use image node_id 3 for calling the TaggedTransformer obj's underlying member method code with example usage: obj.word2features(s) and returns: features