UnboundLocalError: local variable 'features' referenced before assignment

[JeonHyungJin]

At classiPi.py
I can`t find features is assigned.
how can i solve this problem?

[kageomi]

you should initialize variable in extract_features function.
like this.

features = np.empty((0,161))      # add this line 
features = np.vstack([features,ext_features])