Hi, Paolo!
I solved this little problem by installing TF manually, version 2.7.0, which uninstalled Keras 2.3.1 and installed Keras 2.7.0.
As one might expect, it was just a minor inconvenience.
Otherwise, I must say that your book is amazing and your pedagogical talent is outstanding.
I’m a retired system programmer with a long history in telecom industry. So, all that ML hype did not even started during my active years. I made several attempts to conquer ML, but to no avail. You made it possible. Thank you.
Jerry T, Sweden
Carpe diem!!!