From e868950e5f938fe737b26f5040ffc7c09d29f6e6 Mon Sep 17 00:00:00 2001
From: Yu Yang <yuyang18@baidu.com>
Date: Thu, 29 Mar 2018 11:33:21 +0800
Subject: [PATCH] Add comments

---
 paddle/fluid/framework/details/ssa_graph.h                    | 1 +
 paddle/fluid/framework/details/threaded_ssa_graph_executor.cc | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/paddle/fluid/framework/details/ssa_graph.h b/paddle/fluid/framework/details/ssa_graph.h
index c1e041b8c0b..ac3e2d86993 100644
--- a/paddle/fluid/framework/details/ssa_graph.h
+++ b/paddle/fluid/framework/details/ssa_graph.h
@@ -25,6 +25,7 @@ namespace details {
 
 struct SSAGraph {
   std::vector<std::unordered_map<std::string, std::map<int, VarHandle>>> vars_;
+  // aux variables to represent dependency. Useful to resolve data hazard.
   std::unordered_set<std::unique_ptr<VarHandleBase>> dep_vars_;
   std::vector<std::unique_ptr<OpHandleBase>> ops_;
 };
diff --git a/paddle/fluid/framework/details/threaded_ssa_graph_executor.cc b/paddle/fluid/framework/details/threaded_ssa_graph_executor.cc
index 2603aed62ac..3f8655147b6 100644
--- a/paddle/fluid/framework/details/threaded_ssa_graph_executor.cc
+++ b/paddle/fluid/framework/details/threaded_ssa_graph_executor.cc
@@ -15,7 +15,6 @@
 #include "paddle/fluid/framework/details/threaded_ssa_graph_executor.h"
 
 #include "paddle/fluid/framework/details/fetch_op_handle.h"
-#include "paddle/fluid/framework/scope.h"
 
 namespace paddle {
 namespace framework {
-- 
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