def fix_config(self, options):
        """
        Fixes the options, if necessary. I.e., it adds all required elements to the dictionary.

        :param options: the options to fix
        :type options: dict
        :return: the (potentially) fixed options
        :rtype: dict
        """
        options = super(PRC, self).fix_config(options)

        opt = "class_index"
        if opt not in options:
            options[opt] = [0]
        if opt not in self.help:
            self.help[opt] = "The list of 0-based class-label indices to display (list)."

        opt = "key_loc"
        if opt not in options:
            options[opt] = "lower center"
        if opt not in self.help:
            self.help[opt] = "The location of the key in the plot (str)."

        opt = "title"
        if opt not in options:
            options[opt] = None
        if opt not in self.help:
            self.help[opt] = "The title for the plot (str)."

        opt = "outfile"
        if opt not in options:
            options[opt] = None
        if opt not in self.help:
            self.help[opt] = "The file to store the plot in (str)."

        opt = "wait"
        if opt not in options:
            options[opt] = True
        if opt not in self.help:
            self.help[opt] = "Whether to wait for user to close the plot window (bool)."

        return options
Fixes the options, if necessary. I.e., it adds all required elements to the dictionary.

        :param options: the options to fix
        :type options: dict
        :return: the (potentially) fixed options
        :rtype: dict