title: Matlab Convolution using gpu
body: <p>I tried the matlab's convolution function conv2 convn with gpuArray.
  For example convn(gpuArray.rand(100,100,10,'single'),gpuArray.rand(5,'single') and compared it to the cpu version convn(rand(100,100,10),rand(5)). Unfortunately the gpu version is much slower than the cpu version, especially noticeable when I put the function for example into a loop(which will be relevant for me). Does anyone know an alternative to fast convolution using matlab and the gpu for relatively small filtering kernels from 5x5 to 14x14?</p>