gistfile1.txt

diff --git a/theano/tensor/basic.py b/theano/tensor/basic.py
index f9e7240..091486b 100644
--- a/theano/tensor/basic.py
+++ b/theano/tensor/basic.py
@@ -5091,6 +5091,7 @@ class AdvancedSubtensor(Op):
         rest = inputs[1:]
         return [AdvancedIncSubtensor(self.args)(zeros_like(x), gz, *rest)] + [None]*len(rest)
 
+
 class AdvancedIncSubtensor(Op):
     """Increments a subtensor using advanced indexing.
     """
@@ -5121,10 +5122,14 @@ class AdvancedIncSubtensor(Op):
         out[0] = inputs[0].copy()
         out[0][inputs[2:]] += inputs[1]
 
-    #def grad?
-        # grad on x is grad  on output
-        # grad on y is grad_output[idx_list]
-        # grad on rest is None
+    def grad(self, inputs, grads):
+        x, rest = inputs[0], inputs[2:]
+        grad, = grads
+        res = [grad, 
+               AdvancedIncSubtensor(self.args)(zeros_like(x), grad, *rest)] 
+        res += [None for _ in rest]
+        return res
+
     def R_op(self, inputs, eval_points):
         if None in eval_points[:2]:
             return [None]