Why are all Pytorch threads in one cpu?

I have solved it,but the form doesn’t allow me reply until just know :joy: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.