From 584bae1fc6c8576ad005a9697f7d8f1fdf215cfc Mon Sep 17 00:00:00 2001
From: Jiaming Yuan <jm.yuan@outlook.com>
Date: Tue, 22 Feb 2022 08:58:54 +0800
Subject: [PATCH] Fix document build with scikit-learn (#7684)

* Require sphinx >= 4.4 for RTD.

* Install sklearn.
---
 doc/requirements.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/requirements.txt b/doc/requirements.txt
index 8751da518..fed325a3f 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,7 +1,8 @@
-sphinx>=4.2.0
+sphinx>=4.4.0
 mock
 sphinx_rtd_theme>=1.0.0
 breathe
+scikit-learn
 sh>=1.12.14
 matplotlib>=2.1
 graphviz