From 55ff03b7ab858051abafbcadd41fcbc851e67243 Mon Sep 17 00:00:00 2001
From: Yu Yang <yuyang18@baidu.com>
Date: Mon, 6 Aug 2018 05:41:49 +0000
Subject: [PATCH] Do not set loss@Grad as persistable

Revert part of a3ca4c99ebb6c6bbe34606eb19cf6574fe9b3525
---
 python/paddle/fluid/backward.py | 2 --
 1 file changed, 2 deletions(-)

diff --git a/python/paddle/fluid/backward.py b/python/paddle/fluid/backward.py
index 812f68bdd..3fb7019a4 100644
--- a/python/paddle/fluid/backward.py
+++ b/python/paddle/fluid/backward.py
@@ -572,8 +572,6 @@ def append_backward(loss, parameter_list=None, no_grad_set=None,
 
     program.current_block_idx = current_block_idx
     program._sync_with_cpp()
-    # FIXME(zcd): prevent loss.grad optimized by mem_opt.
-    loss.block.var(_append_grad_suffix_(loss.name)).persistable = True
 
     if parameter_list is not None:
         parameters = parameter_list
-- 
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