To update just in case other people have the same problem, by switching to 
bleeding edge theano I no longer experience nan values with cudnn 5 :)

On Thursday, 10 November 2016 09:10:40 UTC+1, Joe Blair wrote:
>
> I have recently been forced to upgrade from cudnn 4 to 5 as Im using a 
> shared server. I am still able to run my network architectures but with 
> some strange results.
>
> I am running with lasagne (bleeding edge version) dnn implementations of 
> 3d and 2d networks (non bleeding edge thenao) and cuda 8.0. I am able to 
> run my 3d cnn fine with reasonable results. However, when I run my 2d 
> architecture i am getting a loss of nan. 
>
> This did not happen with cudnn 4 and as far I can see this is the only 
> change that has been made. Is there any explanation for this?
>
> Anything I can do to rectify the situation? I should note that for my 
> first minibatch I have a loss around 0.5, which is reduced to nan 
> immediatley afterwards.
>
> Best, 
>
> J
>

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