Fix compilation crash with cudnn R2 rc2 due to interface change

theano/sandbox/cuda/cudnn_helper.h

@@ -146,6 +146,14 @@ cudnnConvolutionBackwardData_v2(
 
 #define cudnnConvolutionBackwardData cudnnConvolutionBackwardData_v2
 
+//Needed for R2 rc2
+# define CUDNN_POOLING_AVERAGE_COUNT_INCLUDE_PADDING CUDNN_POOLING_AVERAGE
+#else
+
+// r2 rc1 and rc2 do not have the same macro defined
+// I didn't checked if this the right combination, but as we do not wrap the padding interface, it is fine for now.
+# define CUDNN_POOLING_AVERAGE_COUNT_INCLUDE_PADDING 1
+
 #endif
 
 #endif

theano/sandbox/cuda/dnn.py

@@ -662,7 +662,7 @@ class GpuDnnPoolDesc(GpuOp):
         if self.mode == 'max':
             mode_flag = 'CUDNN_POOLING_MAX'
         elif self.mode == "average":
-            mode_flag = 'CUDNN_POOLING_AVERAGE'
+            mode_flag = 'CUDNN_POOLING_AVERAGE_COUNT_INCLUDE_PADDING'
         else:
             raise NotImplementedError("Unsupported pooling model.")