From 0f77e316917b1456170b15350cd5928ca73bcf0c Mon Sep 17 00:00:00 2001
From: Liufang Sang <slf12thuss@163.com>
Date: Sat, 25 Apr 2020 21:08:23 -0500
Subject: [PATCH] fix error when out is not None test=develop (#24103)

---
 python/paddle/tensor/stat.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/python/paddle/tensor/stat.py b/python/paddle/tensor/stat.py
index 57a498b52dd..7275dc3242f 100644
--- a/python/paddle/tensor/stat.py
+++ b/python/paddle/tensor/stat.py
@@ -151,7 +151,7 @@ def std(input, axis=None, keepdim=False, unbiased=True, out=None, name=None):
 
     tmp = var(input, axis=axis, keepdim=keepdim, unbiased=unbiased, name=name)
     tmp = layers.sqrt(tmp)
-    if out:
+    if out is not None:
         layers.assign(input=tmp, output=out)
         return out
     else:
-- 
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