Update and standardize error messages

theano/sandbox/cuda/dnn.py

@@ -92,27 +92,13 @@ if ((err = cudnnCreate(&_handle)) != CUDNN_STATUS_SUCCESS) {
                                          " from one version, but we link with"
                                          " a different version %s" % str(v))
                     raise RuntimeError(dnn_available.msg)
-                if v == -1:
-                    dnn_available.avail = False
-                    dnn_available.msg = (
-                        "CuDNN v1 detected. This version is no longer "
-                        "supported by Theano. Update your CuDNN installation "
-                        "to v3 or more recent")
-                    raise RuntimeError(dnn_available.msg)
-                if v[0] < 3000:
-                    dnn_available.avail = False
-                    dnn_available.msg = (
-                        "The detected CuDNN installation is older than CuDNN"
-                        " v3. This isn't supported by Theano anymore. Update"
-                        " your CuDNN installation to v3 or more recent.")
-                    raise RuntimeError(dnn_available.msg)
-                if 3000 <= v[0] < 3007:
+                if v == -1 or v[0] < 3007:
                     # 3007 is the final release of cudnn v3
                     dnn_available.avail = False
                     dnn_available.msg = (
-                        "You have installed a release candidate of CuDNN v3."
-                        " This isn't supported anymore."
-                        " Update to CuDNN v3 final version.")
+                        "You have an old release of CuDNN (or a release "
+                        "candidate) that isn't supported.  Please update to "
+                        "at least v3 final version.")
                     raise RuntimeError(dnn_available.msg)
 
     return dnn_available.avail

theano/sandbox/gpuarray/dnn.py

@@ -75,15 +75,11 @@ if ((err = cudnnCreate(&_handle)) != CUDNN_STATUS_SUCCESS) {
 
 def _dnn_check_version():
     v = version()
-    if v < 3000:
+    if v < 3007:
         return False, (
             "You have an old release of CuDNN (or a release candidate) "
             "that isn't supported.  Please update to at least v3 final "
             "version.")
-    if 3000 <= v < 3007:
-        return False, (
-            "You have installed a release candidate of CuDNN v3. This "
-            "isn't supported. Please update to v3 final version.")
 
     return True, None