From 34bdcac500b4d703a1309939bf44e337a2a9683e Mon Sep 17 00:00:00 2001
From: Yi Wang <yiwang01@baidu.com>
Date: Wed, 20 Sep 2017 12:29:25 -0700
Subject: [PATCH] Update

---
 doc/design/program.md | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/doc/design/program.md b/doc/design/program.md
index cc1ffcbaf93..fb8f86ac07a 100644
--- a/doc/design/program.md
+++ b/doc/design/program.md
@@ -21,8 +21,9 @@ message ProgramDesc {
 }
 
 message BlockDesc {
-  repeated VarDesc vars = 1;
-  repeated OpDesc ops = 2;
+  required int32 parent = 1;
+  repeated VarDesc vars = 2;
+  repeated OpDesc ops = 3;
 }
 
 message OpDesc {
@@ -46,9 +47,10 @@ A nested block is often an attribute of an operator, most likely, an IfElseOp or
 With this design, the InferShape function should take the following parameters:
 
 ```c++
-void InferShape(const ProgramDesc* program,
-                int current_block,
-                int current_operator) {
+void InferShape(int current_block,
+                int current_operator,
+                ProgramDesc* program // might change VarDesc values.
+                ) {
   ...
 }
 ```
-- 
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