Module 'keras.backend' has no attribute 'observe_object_name' about chess-alpha-zero

[nikhileshp]

pip list

Package                  Version
------------------------ -------------------
absl-py                  0.12.0
astunparse               1.6.3
cachetools               4.2.1
certifi                  2020.12.5
chardet                  4.0.0
flatbuffers              1.12
gast                     0.4.0
google-api-core          1.26.3
google-api-python-client 1.8.0
google-auth              1.28.1
google-auth-httplib2     0.1.0
google-auth-oauthlib     0.4.4
google-pasta             0.2.0
googleapis-common-protos 1.53.0
grpcio                   1.34.1
h5py                     3.1.0
httplib2                 0.19.1
idna                     2.10
Keras                    2.0.8
keras-nightly            2.5.0.dev2021032900
Keras-Preprocessing      1.1.2
Markdown                 3.3.4
numpy                    1.19.5
oauth2client             4.1.3
oauthlib                 3.1.0
opt-einsum               3.3.0
packaging                20.9
pip                      21.0.1
profilehooks             1.12.0
protobuf                 3.15.8
pyasn1                   0.4.8
pyasn1-modules           0.2.8
pyparsing                2.4.7
pyperclip                1.8.2
python-chess             0.25.1
pytz                     2021.1
PyYAML                   5.4.1
requests                 2.25.1
requests-oauthlib        1.3.0
rsa                      4.7.2
scipy                    1.6.2
setuptools               56.0.0
six                      1.15.0
tensorboard              2.4.1
tensorboard-plugin-wit   1.8.0
tensorflow-estimator     2.5.0rc0
tensorflow-gpu           2.5.0rc1
termcolor                1.1.0
typing-extensions        3.7.4.3
uritemplate              3.0.1
urllib3                  1.26.4
Werkzeug                 1.0.1
wheel                    0.36.2
wrapt                    1.12.1

[nikhileshp]

Problem solved after downgrading from Python 3.8 to Python 3.7 and installing tensorflow-gpu==1.15