Don't register the DestroyHandler on opt that don't need it.

theano/sandbox/cuda/opt.py

@@ -14,7 +14,7 @@ import theano.ifelse
 
 from theano.compile import optdb
 from theano.gof import (local_optimizer, EquilibriumDB, SequenceDB, ProxyDB,
-                        Optimizer, toolbox, DestroyHandler)
+                        Optimizer, toolbox)
 from theano.gof.python25 import all, any
 from theano.sandbox.cuda.basic_ops import (
     device_properties, gpu_eye,
@@ -88,7 +88,6 @@ class InputToGpuOptimizer(Optimizer):
 
     def add_requirements(self, fgraph):
         fgraph.attach_feature(toolbox.ReplaceValidate())
-        fgraph.attach_feature(DestroyHandler())
 
     def apply(self, fgraph):
         for input in fgraph.inputs:

theano/sandbox/gpuarray/opt.py

@@ -5,7 +5,7 @@ from theano import tensor, scalar
 from theano.compile import optdb
 from theano.gof import (local_optimizer, EquilibriumDB,
                         SequenceDB, ProxyDB,
-                        Optimizer, toolbox, DestroyHandler,
+                        Optimizer, toolbox,
                         InconsistencyError, EquilibriumOptimizer)
 
 from theano.gof.python25 import all, any
@@ -90,7 +90,6 @@ class InputToGpuOptimizer(Optimizer):
 
     def add_requirements(self, fgraph):
         fgraph.attach_feature(toolbox.ReplaceValidate())
-        fgraph.attach_feature(DestroyHandler())
 
     def apply(self, fgraph):
         for input in fgraph.inputs:

theano/scan_module/scan_opt.py

@@ -1509,7 +1509,6 @@ class PushOutDot1(gof.Optimizer):
 
     def add_requirements(self, fgraph):
         fgraph.attach_feature(toolbox.ReplaceValidate())
-        fgraph.attach_feature(DestroyHandler())
 
     def apply(self, fgraph):
 

theano/tensor/blas.py

@@ -139,7 +139,7 @@ except ImportError:
     pass
 
 from theano.configparser import config, AddConfigVar, StrParam
-from theano.gof import (utils, Op, view_roots, DestroyHandler,
+from theano.gof import (utils, Op, view_roots,
                         local_optimizer, Optimizer,
                         InconsistencyError, toolbox, SequenceDB,
                         EquilibriumOptimizer, Apply,
@@ -1488,7 +1488,6 @@ class GemmOptimizer(Optimizer):
 
     def add_requirements(self, fgraph):
         fgraph.attach_feature(toolbox.ReplaceValidate())
-        fgraph.attach_feature(DestroyHandler())
 
     def apply(self, fgraph):
         did_something = True

theano/tensor/opt.py

@@ -36,7 +36,7 @@ from theano.gof.python25 import any, all
 from theano.gof.opt import (Optimizer, pre_constant_merge,
                             pre_greedy_local_optimizer)
 from theano.gof.opt import merge_optimizer
-from theano.gof import toolbox, DestroyHandler
+from theano.gof import toolbox
 from theano.tensor.basic import get_scalar_constant_value, ShapeError, NotScalarConstantError
 from theano.compat.six import StringIO
 
@@ -4783,7 +4783,6 @@ class FusionOptimizer(Optimizer):
 
     def add_requirements(self, fgraph):
         fgraph.attach_feature(toolbox.ReplaceValidate())
-        fgraph.attach_feature(DestroyHandler())
 
     def apply(self, fgraph):
         did_something = True