You didn't give a detailed description so I can't be sure if we were facing the same exact error. But at some point when the code ran in my machine, it turned the strings containing the paths to the MFCC files into b strings, which is what prompted the attribute error.
I fixed the issue by decoding those strings back into UTF-8 after loading them in the _load_mfcc() function of the data.py file.
You didn't give a detailed description so I can't be sure if we were facing the same exact error. But at some point when the code ran in my machine, it turned the strings containing the paths to the MFCC files into b strings, which is what prompted the attribute error.
I fixed the issue by decoding those strings back into UTF-8 after loading them in the _load_mfcc() function of the data.py file.