Fix document build with scikit-learn (#7684)

* Require sphinx >= 4.4 for RTD. * Install sklearn.
dmlc · Feb 22, 2022 · 584bae1 · 584bae1
1 parent e56d177
commit 584bae1
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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