image 256x256

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What steps will reproduce the problem?
1. 1000 images of the size 256x256 into a batch
2. modification of convdata.py
3. Try to train the network

What is the expected output? What do you see instead?
It's working with the size 32x32, 64x64 but if the images are bigger than that 
I have a "device memory allocation error". I think it comes from nvmatrix.cu, 
the cublasallocation is not working. 


What version of the product are you using? On what operating system?
I have a gpu GTX 590.  

Original issue reported on code.google.com by juliette...@gmail.com on 16 Jun 2014 at 8:07