Local laplacian gradient does not work

[mshafiei]

Hi,

I'm trying to get the gradient of local laplacian generator. When I add GRADIENT_DESCENT_OPT "GRADIENT_DESCENT" to python_bindings/apps/CMakeLists.txt:48 the local laplacian app breaks. The output image turns out to be pitch black. Also the gradient image is black (you need to add an additional buffer as the last parameter list of the generator in the local_laplacian_app.py). Is there any workaround for this issue?