init USE_CUDA in Segment.getImages for spmd use

matlab/+DenoiseCache/batchDenoise.m

@@ -55,6 +55,7 @@ end
 % write the NLM settings (for cache validation)
 h5create(targetFile,'/Metadata/NLM',4);
 h5write(targetFile,'/Metadata/NLM',segParams.NLM);
+4;
 
 function prepareH5(targetFile,im)
 szim=size(im);

matlab/+Segment/getImages.m

@@ -35,6 +35,11 @@ if false==segParams.denoise
 end
 
 global USE_CUDA
+if isempty(USE_CUDA)
+    % when we run batchdenoise, in the spmd this global won't be set
+    % make sure to set it here...
+    USE_CUDA=segParams.useCuda&&~ismac && HIP.Cuda.DeviceCount>0;
+end
 bUseCuda=USE_CUDA;
 if 4~=length(segParams.NLM)
     bUseCuda=false;