Do not call as_tensor_variable on other Theano variable.

theano/gof/op.py

@@ -638,8 +638,11 @@ def get_test_value(v):
     For a Shared variable, it is the internal value.
     For another Variable, it is the content of v.tag.test_value.
     """
-    v_tensor = theano.tensor.as_tensor_variable(v)
-    return PureOp._get_test_value(v_tensor)
+    if not isinstance(v, graph.Variable):
+        v_var = theano.tensor.as_tensor_variable(v)
+    else:
+        v_var = v
+    return PureOp._get_test_value(v_var)
 
 
 def missing_test_message(msg):

theano/gof/opt.py

@@ -548,7 +548,7 @@ class MergeOptimizer(Optimizer):
                 except InconsistencyError:
                     success = False
                     fgraph.merge_feature.blacklist.append(
-                            (pairs[0][0].owner, pairs[0][1].owner))
+                        (pairs[0][0].owner, pairs[0][1].owner))
                 if success:
                     break
 
@@ -1027,7 +1027,7 @@ class PatternSub(LocalOptimizer):
             else:
                 return pattern.clone()
         u = match(self.in_pattern, node.out, unify.Unification(), True,
-                self.pdb)
+                  self.pdb)
         if u:
             p = self.out_pattern
             new = build(p, u)