add .detach to fix .numpy() issue

fastai / course-v3

The 3rd edition of course.fast.ai

https://course.fast.ai/

Apache License 2.0

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Closed yannklein closed 4 years ago

yannklein commented 4 years ago

While running plt.scatter(x[:,0],x@a)

I had the following issue: RuntimeError: Can't call numpy() on Variable that requires grad. Use var.detach().numpy() instead.

After some googling, I found this solution.

Thus, I propose the following fix to smoothen the Lesson SGD :) Fix: plt.scatter(x[:,0],x@a.detach())

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