ModuleNotFound on my Windows 10 for some modules such as fastai.torch_imports etc

ModuleNotFound error 

on my Windows 10, nVidia 1050Ti machine
for the following modules fastai.torch_imports ,, fastai.model, fastai.dataset. I dont find fastai.torch_imports , even in the fastai github repo. And the fastai.model, fastai.datasets are fastai.models, fastai.dataset in the repo. Any way I can fix these errors