def bet_sizing(bs_dict, proba, ratio):
    """
    Gets bet sizing given a bet sizing dictionary and prediction proba and ratio brackets.
    :param bs_dict: (pandas DataFrame) truth table for bet sizing 
    :param proba: (int) Proba bracket
    :param ratio: (int) Ratio bracket

    :return: Bet Sizing for given 'predict_proba' and 'ratio' bracket given a truth table
    :rtype: float
    """
    return bs_dict.loc[proba, ratio]
