ModuleNotFoundError: No module named 'cooltools.expected'

[PengfeiInTuebingen]

Hi, I am using this tool to calculate the contact P(s) curve, I met a problem like below:
from cooltools.expected import logbin_expected, diagsum, combine_binned_expected
import cooler
import matplotlib.pyplot as plt
import pandas as pd
import multiprocess
import bioframe
import pickle
from scipy.interpolate import interp1d

#cooler, version 0.8.10
#Python 3.7.9

ModuleNotFoundError Traceback (most recent call last)
Input In [39], in <cell line: 1>()
----> 1 from cooltools.expected import logbin_expected, diagsum, combine_binned_expected
2 import cooler
3 import matplotlib.pyplot as plt

ModuleNotFoundError: No module named 'cooltools.expected'
do you have any suggestions to solve this?
Thanks in advance!
Best,
Pengfei