A relevant question has been answered here. However, after I update my numpy, scipy, and scikit-learn packages,
xxx:~$ pip3 freeze | grep numpy
numpy==1.19.2
xxx:~$ pip3 freeze | grep scipy
scipy==1.5.2
xxx:~$ pip3 freeze | grep scikit-learn
scikit-learn==0.23.2
and run (I restart the terminal)
import scipy.stats as st
I still have the error ModuleNotFoundError: No module named 'numpy.testing.decorators'.
A comment:
This error only shows up for Python3. For Python2, it goes through.