  ekf_sym = "helpers/ekf_sym.py"
  
  to_build = {
      'pos_computer_4': 'helpers/lst_sq_computer.py',
      'feature_handler_5': 'helpers/feature_handler.py',
      'gnss': 'models/gnss_kf.py',
      'loc_4': 'models/loc_kf.py',
      'live': 'models/live_kf.py',
 
</s> remove                 command_file.get_abspath()
 </s> add                 command_file.get_abspath()+" "+target </s> remove   # TODO: get K from argparse
  LstSqComputer.generate_code()
 </s> add   K = int(sys.argv[1].split("_")[-1])
  LstSqComputer.generate_code(K=K)

    'pos_computer_5': 'helpers/lst_sq_computer.py',
  ekf_sym = "helpers/ekf_sym.py"
  
  to_build = {
      'pos_computer_4': 'helpers/lst_sq_computer.py',
    'pos_computer_5': 'helpers/lst_sq_computer.py',
      'feature_handler_5': 'helpers/feature_handler.py',
      'gnss': 'models/gnss_kf.py',
      'loc_4': 'models/loc_kf.py',
      'live': 'models/live_kf.py',
keep keep keep add keep keep keep keep
 build lst_sq_computer 4 and 5 
selfdrive/locationd/kalman/SConscript