docs: def decipher(self):
          """Decipher """
  
          # calculate time thread took to finish
          # logging.info('Starting HI score')
          tstart = datetime.now()
  
          decipher_obj = decipher.Decipher(self.vcf_file)
          decipher_obj.run()
  
          tend = datetime.now()
          execution_time = tend - tstart