'str' object has no attribute 'decode'

[ruaruaruabick]

I follow the examples and get something wrong,
here are my codes

import speechmetrics
window_length = 5 # seconds
metrics = speechmetrics.load('absolute', window_length)
scores = metrics("/Wave/000001.wav")
print(scores)

and I get errors like this:

'str' object has no attribute 'decode'
  File "/home/mike/testaudioquality/test.py", line 3, in <module>
    metrics = speechmetrics.load('absolute', window_length)

the versions of my python is 3.6 and my tensorflow-gpu version is 2.0.0

[ruaruaruabick]

I think there may be something wrong when using tensorflow-gpu, after I installed tensorflow-cpu, the program runs well.