Try to fix segmentation fault related to last updates in cuDNN conv codes.

theano/gof/cc.py

@@ -235,6 +235,7 @@ def struct_gen(args, struct_builders, blocks, sub):
 
     # declares the storage
     storage_decl = "\n".join(["PyObject* %s;" % arg for arg in args])
+    storage_init = "\n".join(["this->%s = NULL;" % arg for arg in args])
     # in the constructor, sets the storage to the arguments
     storage_set = "\n".join(["this->%s = %s;" % (arg, arg) for arg in args])
     # increments the storage's refcount in the constructor
@@ -290,6 +291,8 @@ def struct_gen(args, struct_builders, blocks, sub):
         %(struct_decl)s
 
         %(name)s() {
+            %(storage_init)s
+
             // This is only somewhat safe because we:
             //  1) Are not a virtual class
             //  2) Do not use any virtual classes in the members
@@ -299,7 +302,9 @@ def struct_gen(args, struct_builders, blocks, sub):
             // now I am tired of chasing segfaults because
             // initialization code had an error and some pointer has
             // a junk value.
+            #ifndef THEANO_DONT_MEMSET_STRUCT
             memset(this, 0, sizeof(*this));
+            #endif
         }
         ~%(name)s(void) {
             cleanup();

theano/gpuarray/c_code/dnn_fwd.c

@@ -9,6 +9,9 @@ hash_prefix = std::string("FWD|GPU#");
 int     reuse_algo;
 AlgoRec prev_algo;
 std::string hash_prefix;
+
+#define THEANO_DONT_MEMSET_STRUCT
+
 #ifdef DEBUG
 char algorithm_name[128];
 #endif

theano/gpuarray/c_code/dnn_gi.c

@@ -9,6 +9,9 @@ hash_prefix = std::string("GI|GPU#");
 int     reuse_algo;
 AlgoRec prev_algo;
 std::string hash_prefix;
+
+#define THEANO_DONT_MEMSET_STRUCT
+
 #ifdef DEBUG
 char algorithm_name[128];
 #endif

theano/gpuarray/c_code/dnn_gw.c

@@ -9,6 +9,9 @@ hash_prefix = std::string("GW|GPU#");
 int     reuse_algo;
 AlgoRec prev_algo;
 std::string hash_prefix;
+
+#define THEANO_DONT_MEMSET_STRUCT
+
 #ifdef DEBUG
 char algorithm_name[128];
 #endif