cannot import name '_CF' from 'lib.dataset._cf'

[Xyonia]

Hello, wheni am trying to start training sequence it results with that (cannot import name '_CF' from 'lib.dataset._cf') error. When i checked lib/dataset folder there are other .py documents but there is now.py document forCF. I prepared the data and dataset as up to "https://github.com/Sierkinhane/CRNN_Chinese_Characters_Rec/" and can traind at that repo. Can anyone help me to train with this repo?
Thanks