1 files changed, 11 insertions, 3 deletions
diff --git a/src/graph/node_operators_unary.h b/src/graph/node_operators_unary.h
index 05294bee..9d5b8287 100644
--- a/src/graph/node_operators_unary.h
+++ b/src/graph/node_operators_unary.h
@@ -55,7 +55,10 @@ public:
     return {NodeOp(Element(_1 = _2 + scalar_, val_, child(0)->val()))};
   }
 
-  NodeOps backwardOps() { return {NodeOp(Add(_1, child(0)->grad(), adj_))}; }
+  NodeOps backwardOps() {
+    using namespace functional;
+    return {NodeOp(Add(_1, child(0)->grad(), adj_))};
+  }
 
   const std::string type() { return "scalar_add"; }
 };
@@ -392,9 +395,14 @@ struct SumNodeOp : public UnaryNodeOp {
   SumNodeOp(Expr a, Args... args)
       : UnaryNodeOp(a, keywords::shape = newShape(a, args...), args...) {}
 
-  NodeOps forwardOps() { return {NodeOp(Reduce(_1, val_, child(0)->val()))}; }
+  NodeOps forwardOps() {
+    using namespace functional;
+
+    return {NodeOp(Reduce(_1, val_, child(0)->val()))}; }
 
-  NodeOps backwardOps() { return {NodeOp(Add(_1, child(0)->grad(), adj_))}; }
+  NodeOps backwardOps() {
+    using namespace functional;
+    return {NodeOp(Add(_1, child(0)->grad(), adj_))}; }
 
   template <class... Args>
   Shape newShape(Expr a, Args... args) {