Installing Cuda and cudnn is not mandatory?

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?

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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I really appreciate you for answering.