Installing Cuda and cudnn is not mandatory?

1

I installed pytorch 1.0 on anaconda after installing only the graphic driver.
And I confirmed that the torch.cuda.current_device () function works well.

That means that if I install only a graphic driver,
can I use pytorch with every functions and full speed without installing cuda and cudnn?

If yes, where is it mentioned?

2

when you use conda to install pytorch, it install cuda and cudnn along with, but it seems this cuda and cudnn only work of pytorch

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3

I really appreciate you for answering.