I have solved it，but the form doesn’t allow me reply until just know 
I focus on it because only using one cores causing the speed of train is very slow. After solved, the speed is faster more than 10x.
I have solved it. Just update the version of python. The speed of train is faster more than 10x! The dispatch of my python 3.6.10 may be with some error.
Hey, I have a same issue. When I open task manager in my Win10, I can see 16 (logical) processors but only two of them on 100% all others are idle.
because of this DataLoader doesn’t feed enough the GPU.
So, how did You solved it?
Thanks.
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