code: def process_files(self):
      if self.args.input_type == "hts":
          self.process_hts_files()
  
      elif self.args.input_type == "xml":
          self.process_xml_files()
  
imports: import argparse
  import math
  import os
  import sys
  import music21
  from espnet2.fileio.score_scp import SingingScoreWriter, XMLReader
label_desc: Use image node_id 12 for calling the DataHandler obj's underlying member method code with example usage: obj.process_files() without return types