def proper_form(s:str)->str:
    """
    return properly formed string for 
    metric to be consistent, for example a_prc->AUPRC
    since in papers & other official documents we abbreviate 
    "area under the precison recall curve" as AUPRC
    :parm s: any string
    :return: proper form of input value if we know it, the input value unchanged if not
    """
    if s == "a_prc":
        return "\\ac{AUPRC}"
    elif s == "auc":
        return "\\ac{AUC}"
    elif s == "acc":
        return "accuracy"
    else:
        return s