def parsimonious_acr(tree, character, prediction_method, states, num_nodes, num_tips):
    """
    Calculates parsimonious states on the tree and stores them in the corresponding feature.

    :param states: numpy array of possible states
    :param prediction_method: str, ACCTRAN (accelerated transformation), DELTRAN (delayed transformation) or DOWNPASS
    :param tree: ete3.Tree, the tree of interest
    :param character: str, character for which the parsimonious states are reconstructed
    :return: dict, mapping between reconstruction parameters and values
    """
    initialise_parsimonious_states(tree, character, states)
    uppass(tree, character)

    results = []
    result = {STATES: states, NUM_NODES: num_nodes, NUM_TIPS: num_tips}

    logger = logging.getLogger('pastml')

    def process_result(method, feature):
        out_feature = get_personalized_feature_name(character, method) if prediction_method != method else character
        res = result.copy()
        res[NUM_SCENARIOS], res[NUM_UNRESOLVED_NODES], res[NUM_STATES_PER_NODE] \
            = choose_parsimonious_states(tree, feature, out_feature)
        res[NUM_STATES_PER_NODE] /= num_nodes
        res[PERC_UNRESOLVED] = res[NUM_UNRESOLVED_NODES] * 100 / num_nodes
        logger.debug('{} node{} unresolved ({:.2f}%) for {} by {}, '
                     'i.e. {:.4f} state{} per node in average.'
                     .format(res[NUM_UNRESOLVED_NODES], 's are' if res[NUM_UNRESOLVED_NODES] != 1 else ' is',
                             res[PERC_UNRESOLVED], character, method,
                             res[NUM_STATES_PER_NODE], 's' if res[NUM_STATES_PER_NODE] > 1 else ''))
        res[CHARACTER] = out_feature
        res[METHOD] = method
        results.append(res)

    if prediction_method in {ACCTRAN, MP}:
        feature = get_personalized_feature_name(character, PARS_STATES)
        if prediction_method == MP:
            feature = get_personalized_feature_name(feature, ACCTRAN)
        acctran(tree, character, feature)
        result[STEPS] = get_num_parsimonious_steps(tree, feature)
        process_result(ACCTRAN, feature)

        bu_feature = get_personalized_feature_name(character, BU_PARS_STATES)
        for node in tree.traverse():
            if prediction_method == ACCTRAN:
                node.del_feature(bu_feature)
            node.del_feature(feature)

    if prediction_method != ACCTRAN:
        downpass(tree, character, states)
        feature = get_personalized_feature_name(character, PARS_STATES)
        if prediction_method == DOWNPASS:
            result[STEPS] = get_num_parsimonious_steps(tree, feature)
        if prediction_method in {DOWNPASS, MP}:
            process_result(DOWNPASS, feature)
        if prediction_method in {DELTRAN, MP}:
            deltran(tree, character)
            if prediction_method == DELTRAN:
                result[STEPS] = get_num_parsimonious_steps(tree, feature)
            process_result(DELTRAN, feature)
        for node in tree.traverse():
            node.del_feature(feature)

    logger.debug("Parsimonious reconstruction for {} requires {} state changes."
                 .format(character, result[STEPS]))
    return results
Calculates parsimonious states on the tree and stores them in the corresponding feature.

    :param states: numpy array of possible states
    :param prediction_method: str, ACCTRAN (accelerated transformation), DELTRAN (delayed transformation) or DOWNPASS
    :param tree: ete3.Tree, the tree of interest
    :param character: str, character for which the parsimonious states are reconstructed
    :return: dict, mapping between reconstruction parameters and values