From c030589df65081dcc95f5366c8db84990537d7ad Mon Sep 17 00:00:00 2001
From: Yang Yang <yangyang62@baidu.com>
Date: Fri, 20 Oct 2017 22:52:51 +0000
Subject: [PATCH] add optional in op proto

---
 paddle/framework/framework.proto  | 1 +
 paddle/framework/op_proto_maker.h | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/paddle/framework/framework.proto b/paddle/framework/framework.proto
index 2aa961f140..3d023535ef 100644
--- a/paddle/framework/framework.proto
+++ b/paddle/framework/framework.proto
@@ -68,6 +68,7 @@ message OpProto {
 
     optional bool duplicable = 3 [ default = false ];
     optional bool intermediate = 4 [ default = false ];
+    optional bool dispensable = 5 [ default = false ];
   }
 
   // AttrProto describes the C++ type Attribute.
diff --git a/paddle/framework/op_proto_maker.h b/paddle/framework/op_proto_maker.h
index a134befd90..44e8ab1689 100644
--- a/paddle/framework/op_proto_maker.h
+++ b/paddle/framework/op_proto_maker.h
@@ -44,6 +44,11 @@ class OpProtoAndCheckerMaker {
       var_->set_intermediate(true);
       return *this;
     }
+
+    VariableBuilder& AsDispensable() {
+      var_->set_dispensable(true);
+      return *this;
+    }
   };
 
   VariableBuilder AddInput(const std::string& name, const std::string& comment);
-- 
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