From c4e480efc51dff89f76d5c4b4e97a9c9458cb9ae Mon Sep 17 00:00:00 2001
From: Yang Zhang <yangzhang@live.com>
Date: Fri, 14 Aug 2020 19:33:37 +0800
Subject: [PATCH] Fix `paddle.cos` docstring (#25969)

test=develop,test=document_fix

explain input/out put range and out of boundary behavior
---
 paddle/fluid/operators/activation_op.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/paddle/fluid/operators/activation_op.cc b/paddle/fluid/operators/activation_op.cc
index 107d333d3a8..7dedb36d6e1 100644
--- a/paddle/fluid/operators/activation_op.cc
+++ b/paddle/fluid/operators/activation_op.cc
@@ -242,6 +242,9 @@ $$out = \\left \\lfloor x \\right \\rfloor$$
 UNUSED constexpr char CosDoc[] = R"DOC(
 Cosine Operator. Computes cosine of x element-wise.
 
+Input range is `(-inf, inf)` and output range is `[-1,1]`.
+Return `nan` if input is out of boundary.
+
 $$out = cos(x)$$
 
 )DOC";
-- 
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