minor changes in fast_destroy

theano/gof/destroyhandler.py

@@ -823,8 +823,10 @@ class DestroyHandler(toolbox.Bookkeeper):  # noqa
                             self.fail_validate[app] = theano.gof.InconsistencyError(
                                 "Destroyed variable has destroy_map. " + str(reason))
 
-                assert len(v) <= 1
-                assert len(d) <= 1
+                # The 2 assertions are commented since this function is called so many times
+                # but they should be true.
+                # assert len(v) <= 1
+                # assert len(d) <= 1
 
     def on_import(self, fgraph, app, reason):
         """