Fix bug in computing hash

reconstruct_graph always replaces CudaNdarrays with TensorTypes, so in case of a gpu scan op, we can not use that logic to generate a hash ( I compute it locally when I am generating the gpu scan op).

Fix bug in computing hash
32638671 · Razvan Pascanu · c28d13a0 · 32638671
--- a/theano/scan_module/scan_op.py
+++ b/theano/scan_module/scan_op.py
@@ -141,11 +141,14 @@ class Scan(Op):
                                    self.n_shared_outs )
        self.n_outs = self.n_mit_mot + self.n_mit_sot + self.n_sit_sot
        self.n_tap_outs = self.n_mit_mot + self.n_mit_sot
+        if not self.info['gpu']:
            tmp_in, tmp_out = scan_utils.reconstruct_graph(self.inputs,
                                                       self.outputs)
            local_env = gof.Env(tmp_in, tmp_out)
            self._cmodule_key = gof.CLinker.cmodule_key_(local_env,[])
            self._hash_inner_graph = hash(self._cmodule_key)
+        else:
+            self._hash_inner_graph = self.info['gpu_hash']
    def make_node(self, *inputs):