code: def check_executables():
      
      print("\033[1mCheck executables\033[0m")
      required_executables = [utils.get_nntoolkit()]
      for executable in required_executables:
          path = which(executable)
          if path is None:
              print("%s ... %sNOT%s found" % (executable, Bcolors.WARNING,
                                              Bcolors.ENDC))
          else:
              print("%s ... %sfound%s at %s" % (executable, Bcolors.OKGREEN,
                                                Bcolors.ENDC, path))
docs: Check if all necessary / recommended executables are installed.