Move imports to the top of the file.

theano/sandbox/gpuarray/conv.py

@@ -241,7 +241,6 @@ class GpuConv(GpuKernelBase, HideC, gof.Op):
             raise MethodNotDefined('cuda only')
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
         else:
             return []

theano/sandbox/gpuarray/elemwise.py

 from __future__ import print_function
 import copy
+import os
 from theano.compat import izip
 import numpy
 
@@ -177,7 +178,6 @@ class GpuElemwise(GpuKernelBase, HideC, Elemwise):
             raise MethodNotDefined('cuda only')
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
         else:
             return []
@@ -735,7 +735,6 @@ class GpuCAReduceCuda(GpuKernelBase, HideC, CAReduceDtype):
     def c_header_dirs(self):
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
 
     def c_headers(self):

theano/sandbox/gpuarray/neighbours.py

@@ -58,7 +58,6 @@ class GpuImages2Neibs(GpuKernelBase, Images2Neibs, Op):
             raise MethodNotDefined('cuda only')
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
         else:
             return []

theano/sandbox/gpuarray/nnet.py

 from __future__ import print_function
 import numpy
+import os
 
 from theano import Op, Apply, config
 from six import StringIO
@@ -45,7 +46,6 @@ class GpuCrossentropySoftmaxArgmax1HotWithBias(GpuKernelBase, Op):
             raise MethodNotDefined('cuda only')
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
 
     def c_headers(self):
@@ -335,7 +335,6 @@ class GpuCrossentropySoftmax1HotWithBiasDx(GpuKernelBase, Op):
             raise MethodNotDefined('cuda only')
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
 
     def c_headers(self):
@@ -549,7 +548,6 @@ class GpuSoftmax (GpuKernelBase, Op):
             raise MethodNotDefined('cuda only')
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
 
     def c_headers(self):
@@ -754,7 +752,6 @@ class GpuSoftmaxWithBias (GpuKernelBase, Op):
             raise MethodNotDefined('cuda only')
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
         else:
             return []

theano/sandbox/gpuarray/subtensor.py

 from __future__ import print_function
 import copy
 import numpy
+import os
 
 import theano
 from theano import tensor, gof, Op, config
@@ -180,7 +181,6 @@ class GpuIncSubtensor(GpuKernelBase, IncSubtensor):
     def c_header_dirs(self):
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
         else:
             return []
@@ -550,7 +550,6 @@ class GpuAdvancedIncSubtensor1_dev20(GpuKernelBase, GpuAdvancedIncSubtensor1):
             raise MethodNotDefined('cuda only')
         cuda_root = config.cuda.root
         if cuda_root:
-            import os
             return [os.path.join(cuda_root, 'include')]
 
     def c_init_code(self):