About the usage of DnCNN with matconvnet-1.0-beta24 on linux

[ZhangJingrong]

Thanks so much for sharing your code. I tried to use it and find two problems:

1. The slash in the path on Linux is different from Windows:

     folderTest  = 'testsets\Set12'; %%% test dataset

2. For "matconvnet" version later than 20, some modifications need to be made.
   A bug " missing field 'dilate' in layers" shows up. I tried to fix this by using

   net = vl_simplenn_tidy(net)
   net = vl_simplenn_move(net,'gpu');

before

   res    = vl_simplenn(net,input,[],[],'conserveMemory',true,'mode','test');

Now it works.

[cszn]

Thanks. ^_^