Limit new convolution implementations to CuDNN V4

theano/sandbox/cuda/dnn.py

@@ -460,6 +460,12 @@ class GpuDnnConv(DnnBase, COp):
                 raise RuntimeError("CuDNN convolution timing requires CuDNN "
                                    "v3")
 
+        # The fft_tiling implementation is only available from CuDNN V4 onward
+        if version() < (4000, 4000):
+            if self.algo == 'fft_tiling':
+                raise RuntimeError("CuDNN tiled-FFT convolution requires "
+                                   "CuDNN v4 or more recent")
+
         assert self.algo in ['none', 'small', 'large', 'fft', 'fft_tiling',
                              'guess_once', 'guess_on_shape_change',
                              'time_once', 'time_on_shape_change']
@@ -699,6 +705,14 @@ class GpuDnnConvGradW(DnnBase, COp):
         self.inplace = inplace
         if self.inplace:
             self.destroy_map = {0: [2]}
+
+        # The small-workspace implementation is only available from CuDNN V4
+        # onward.
+        if version() < (4000, 4000):
+            if self.algo == 'small':
+                raise RuntimeError("CuDNN's small workspace GradW convolution "
+                                   "requires CuDNN v4 or more recent.")
+
         assert self.algo in ['none', 'deterministic', 'fft', 'small',
                              'guess_once', 'guess_on_shape_change',
                              'time_once', 'time_on_shape_change']
@@ -911,6 +925,14 @@ class GpuDnnConvGradI(DnnBase, COp):
         self.inplace = inplace
         if self.inplace:
             self.destroy_map = {0: [2]}
+
+        # The small-workspace implementation is only available from CuDNN V4
+        # onward.
+        if version() < (4000, 4000):
+            if self.algo == 'fft_tiling':
+                raise RuntimeError("CuDNN's tiled-FFT convolution requires "
+                                   "CuDNN v4 or more recent")
+
         assert self.algo in ['none', 'deterministic', 'fft', 'fft_tiling',
                              'guess_once', 'guess_on_shape_change',
                              'time_once', 'time_on_shape_change']