Fix metaoptimizer for cudnn

theano/gof/opt.py

@@ -884,7 +884,8 @@ class LocalMetaOptimizer(LocalOptimizer):
             outputs = opt.transform(node)
             if outputs:
                 try:
-                    fn = theano.function([], outputs, givens=givens)
+                    fn = theano.function([], outputs, givens=givens,
+                                         on_unused_input='ignore')
                     timing = min(self.time_call(fn) for _ in range(3))
                 except Exception as e:
                     if self.verbose: