From 8b8530c5f629e9b11c84ec3647ed969310d25cf2 Mon Sep 17 00:00:00 2001
From: juncaipeng <52520497+juncaipeng@users.noreply.github.com>
Date: Wed, 5 Feb 2020 09:31:58 +0800
Subject: [PATCH] fix chain doc, test=develop, test=document_preview (#22070)
 (#22428)

* fix chain doc, test=develop, test=document_preview
---
 python/paddle/reader/decorator.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/python/paddle/reader/decorator.py b/python/paddle/reader/decorator.py
index dd3a143462..becf61934e 100644
--- a/python/paddle/reader/decorator.py
+++ b/python/paddle/reader/decorator.py
@@ -151,7 +151,8 @@ def shuffle(reader, buf_size):
 def chain(*readers):
     """
     Use the input data readers to create a chained data reader. The new created reader
-    chains the outputs of input readers together as its output.
+    chains the outputs of input readers together as its output, and it do not change
+    the format of the outputs.
 
     **Note**:
         ``paddle.reader.chain`` is the alias of ``paddle.fluid.io.chain``, and
@@ -162,7 +163,7 @@ def chain(*readers):
     [10, 10, 10],
     [20, 20, 20].
     The chained reader will output:
-    [[0, 0, 0], [10, 10, 10], [20, 20, 20]].
+    [0, 0, 0], [10, 10, 10], [20, 20, 20].
 
     Args:
         readers(list): input data readers.
-- 
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