def total_reliability(features):
    """
    Calculates the total reliability of the features.
    
    Parameters
    ----------
    features : dictionary
        a dictionary of features with keys as feature name and values as objects of
        feature class.
     
    Returns
    -------
    total_rel : float
        the total reliability of the features
    """
    total_rel = 0
    for feat in features.values():
        total_rel = total_rel + feat.reliability
    return total_rel
