Part 2 Lesson 8 - 'No loop matching the specified signature and casting was found for ufunc add'

I’m trying to run the code from pascal.ipnyb on AWS p2xlarge machine.
As mentioned in the notebook, I’m using fastai version 0.7. For this, I did

!pip install torchvision fastai==0.7

After finding the learning rate using

lrf=learn.lr_find(1e-5,100)

I’m calling the learn.fit method. It runs properly till 31/32 and then suddenly I get the error ‘No loop matching the specified signature and casting was found for ufunc add’

Can anyone help me out please?

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