More conditional imports

nabu/cuda/convolution.py

 import numpy as np
 from os.path import dirname
 from silx.image.utils import gaussian_kernel
-import pycuda.gpuarray as garray
-from pycuda.compiler import SourceModule
-from ..utils import updiv, get_cuda_srcfile
+from ..utils import updiv, get_cuda_srcfile, __has_pycuda__
 from ..misc.utils import ConvolutionInfos
 from .processing import CudaProcessing
 
+if __has_pycuda__:
+    import pycuda.gpuarray as garray
+    from pycuda.compiler import SourceModule
+
 
 class Convolution(CudaProcessing):
     """

nabu/misc/unsharp_cuda.py

-import pycuda.gpuarray as garray
+from ..cuda.utils import __has_pycuda__
 from ..cuda.convolution import Convolution
-from pycuda.elementwise import ElementwiseKernel
 from ..cuda.processing import CudaProcessing
 from .unsharp import UnsharpMask
+if __has_pycuda__:
+    import pycuda.gpuarray as garray
+    from pycuda.elementwise import ElementwiseKernel
 
 class CudaUnsharpMask(UnsharpMask, CudaProcessing):
     def __init__(self, shape, sigma, coeff, mode="reflect", method="gaussian",