make local_fill_sink call itself recursively init commit

theano/tensor/opt.py

@@ -3576,7 +3576,9 @@ def local_fill_sink(node):
 
     f need to be an elemwise
     """
-    if not isinstance(node.op, T.Elemwise) or node.op == T.fill:
+    if (not hasattr(node, 'op') or
+            not isinstance(node.op, T.Elemwise) or
+            node.op == T.fill):
         return False
     models = []
     inputs = []
@@ -3591,6 +3593,18 @@ def local_fill_sink(node):
     c = node.op(*inputs)
     for model in models:
         c = T.fill(model, c)
+
+    # The newly created node c doesn't has 'clients',
+    # so this iteration is took place with node.outputs[0]
+    for client, _ in node.outputs[0].clients:
+        if (hasattr(client, 'op') and
+                isinstance(client.op, T.Elemwise) and
+                not client.op == T.fill):
+            node_sub_c = client.op([v for v in client.inputs if v is not c])
+            # import ipdb; ipdb.set_trace()
+            r = local_fill_sink.transform(node_sub_c)
+            if r:
+                return {client: r}
     return [c]
 
 register_canonicalize(local_fill_sink)