Fix cudnn crash with v1

theano/sandbox/cuda/cudnn_helper.h

@@ -73,6 +73,20 @@ cudnnGetConvolutionForwardAlgorithm(
   return CUDNN_STATUS_SUCCESS;
 }
 
+static inline cudnnStatus_t
+cudnnGetConvolutionForwardWorkspaceSize(
+ cudnnHandle_t handle,
+ const cudnnTensorDescriptor_t srcDesc,
+ const cudnnFilterDescriptor_t filterDesc,
+ const cudnnConvolutionDescriptor_t convDesc,
+ const cudnnTensor4dDescriptor_t destDesc,
+ cudnnConvolutionFwdAlgo_t algo,
+ size_t *sizeInBytes) {
+  *sizeInBytes = 0;
+  return CUDNN_STATUS_SUCCESS;
+}
+
+
 static inline cudnnStatus_t
 cudnnConvolutionForward_v2(
   cudnnHandle_t handle,

theano/sandbox/cuda/dnn.py

@@ -362,6 +362,8 @@ class GpuDnnConv(DnnBase, COp):
             self.workmem = 'small'
 
     def get_op_params(self):
+        if version() == -1:
+            return [('CONV_ALGO', "0")]
         if self.workmem == 'none':
             alg = 'CUDNN_CONVOLUTION_FWD_ALGO_IMPLICIT_GEMM'
         elif self.workmem == 'small':