Adding LocalGroupDB to in2out

theano/compile/mode.py

@@ -159,7 +159,6 @@ optdb.register('useless', gof.optdb.TopoDB(local_useless),
 # The opt should not do anything that need shape inference.
 # New nodes that don't have infer_shape need that the original node
 # also don't have infer_shape
-
 optdb.register('merge1.1', gof.MergeOptimizer(),
                0.65, 'fast_run', 'fast_compile', 'merge')
 

theano/tensor/opt.py

@@ -369,7 +369,9 @@ compile.optdb.register('inplace_elemwise_opt', inplace_elemwise_optimizer, 75,
                        'inplace_elemwise_optimizer',
                        'fast_run', 'inplace')
 
-position = 0
+
+local_useless = LocalGroupDB()
+
 def register_useless(lopt, *tags, **kwargs):
     if type(lopt) == str:
         def register(inner_lopt):
@@ -379,9 +381,9 @@ def register_useless(lopt, *tags, **kwargs):
         name = kwargs.pop('name', None) or lopt.__name__
         compile.mode.local_useless.register(name, lopt, 'last', 'fast_run',
                                             *tags, **kwargs)
-        return lopt
-
 
+        return lopt
+compile.optdb.register('useless', TopoOptimizer(local_useless, order="in_to_out"), 0.6, 'fast_run', 'fast_compile')
 
 def register_canonicalize(lopt, *tags, **kwargs):
     if type(lopt) == str: