From 0bdd8bfb2bec61d9f636adb61c682ce2356b1b3c Mon Sep 17 00:00:00 2001
From: JC Liu <liujiacheng0810@163.com>
Date: Fri, 9 Jun 2017 19:18:25 +0800
Subject: [PATCH] Add ref (#9064)

* Add ref

* Fix pep8
---
 sklearn/datasets/base.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sklearn/datasets/base.py b/sklearn/datasets/base.py
index 5fa5668daf..1441daf838 100644
--- a/sklearn/datasets/base.py
+++ b/sklearn/datasets/base.py
@@ -499,6 +499,9 @@ def load_digits(n_class=10, return_X_y=False):
 
         .. versionadded:: 0.18
 
+    This is a copy of the test set of the UCI ML hand-written digits datasets
+    http://archive.ics.uci.edu/ml/datasets/Optical+Recognition+of+Handwritten+Digits
+
     Examples
     --------
     To load the data and visualize the images::
-- 
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