def plus_app(x):
    x1, x2 = split_attrs(x)
    return x1 + x2
def devide_app(x):
    x1, x2 = split_attrs(x)
    return x1 / x2
def minus_abs_app(x):
    x1, x2 = split_attrs(x)
    return np.abs(x1 - x2)
def log_app(x):
    x1, x2 = split_attrs(x)
    return np.abs(np.log((x1 + 1) / (x2 + 1)))
def minus_app(x):
    x1, x2 = split_attrs(x)
    return x1 - x2