applying Fredits

theano/tensor/opt.py

@@ -3413,7 +3413,7 @@ def local_incsubtensor_of_zeros(node):
 @register_canonicalize
 @register_specialize
 @gof.local_optimizer([IncSubtensor])
-def incsubtensor_of_zeros_to_setsubtensor(node):
+def local_incsubtensor_of_zeros_to_setsubtensor(node):
     """
     IncSubtensor(zeros, x, ...) -> SetSubtensor(zeros, x, ...)
     """

theano/tensor/subtensor.py

@@ -573,8 +573,9 @@ class Subtensor(Op):
         else:
             # For best optimization, we let this as an inc.
             # This allow the opt local_IncSubtensor_serialize to apply first.
-            # We need to implement an optimization that will convert this to a
-            # set subtensor.
+            # We have an optimization that will convert this to a
+            # set subtensor here at:
+            # theano/tensor/opt.py:local_incsubtensor_of_zeros_to_setsubtensor()
             first = IncSubtensor(self.idx_list)(x.zeros_like(),
                                                 gz, *rest)
         return ([first] + [DisconnectedType()()] * len(rest))