code: def preprocess_vlsp2013(dataset):
      output = []
      for s in dataset:
          si = []
          for row in s:
              token, tag = row
              tag = "B-" + tag
              si.append([token, tag])
          output.append(si)
      return output
  
file_path: underthesea/examples/ner/data.py
imports: from os.path import join
label_desc: Use image node_id 1 for calling a global function with example usage: preprocess_vlsp2013(dataset) and returns: output