def add_argument(self, arg_name, arg_value):
        '''Add an additional argument to be passed to the fitness function
        via additional arguments dictionary; this argument/value is not tuned

        Args:
            arg_name (string): name/dictionary key of argument
            arg_value (any): dictionary value of argument
        '''

        if len(self._employers) > 0:
            self._logger.log(
                'warn',
                'Adding an argument after the employers have been created'
            )
        if self._args is None:
            self._args = {}
        self._args[arg_name] = arg_value
Add an additional argument to be passed to the fitness function
        via additional arguments dictionary; this argument/value is not tuned

        Args:
            arg_name (string): name/dictionary key of argument
            arg_value (any): dictionary value of argument