I use theano.sandbox.rng_mrg.MRG_RandomStreams to generate a 2D (and 1D ) 
dropout masks for applying dropouts. I create it so, 

srng = MRG_RandomStreams(rng.randint(1,89324723894), use_cuda = True) 
mask = srng.binomial (n=1, p=1-dropout_rate,size=params.shape,dtype = 
floatX)

otuput = params *mask. 

doing this operation is doing two things. 

1. If I use the libgpuarray backend, and I have two GPUS, the mask is being 
created in another GPU from the one I have used in config.device. 
2. If I use it with use_cuda = False, it is creating the data in the same 
GPU, but then the code does not run on GPU..

Appreciate any help. 

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