Added an empty 'stabilize' mode to optdb between canonicalize and specialize

theano/compile/mode.py

@@ -129,6 +129,7 @@ class AddDestroyHandler(gof.Optimizer):
 optdb = gof.SequenceDB()
 optdb.register('merge1', gof.MergeOptimizer(), 0, 'fast_run', 'fast_compile')
 optdb.register('canonicalize', gof.EquilibriumDB(), 1, 'fast_run')
+optdb.register('stabilize', gof.EquilibriumDB(), 1.5, 'fast_run')
 optdb.register('specialize', gof.EquilibriumDB(), 2, 'fast_run')
 optdb.register('merge2', gof.MergeOptimizer(), 49, 'fast_run')
 optdb.register('add_destroy_handler', AddDestroyHandler(), 49.5, 'fast_run', 'inplace')