def METHOD_NAME(self):
    """ Get the value of the variables at the root node.
    Returns:
        dict:
            Dictionary mapping variable name (str) to variable value
            (float) for all variables at the root node.
    """
    result = dict()
    for var in self.ef.ref_vars.values():
        var_name = var.name
        dot_index = var_name.find(".")
        if dot_index >= 0 and var_name[:dot_index] in self.all_scenario_names:
            var_name = var_name[dot_index+1:]
        result[var_name] = var.value
    return result