From d8811b39f21d340ebc0637124cdf822d2eb9dfce Mon Sep 17 00:00:00 2001
From: Hanmin Qin <qinhanmin2005@sina.com>
Date: Fri, 30 Jun 2017 19:27:35 +0800
Subject: [PATCH] fix the equation in clustering.rst (#9253)

---
 doc/modules/clustering.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/modules/clustering.rst b/doc/modules/clustering.rst
index 4dda5559b0..b27496944a 100644
--- a/doc/modules/clustering.rst
+++ b/doc/modules/clustering.rst
@@ -1136,7 +1136,7 @@ picked at random falls into both classes :math:`U_i` and :math:`V_j`.
 
 It also can be expressed in set cardinality formulation:
 
-.. math:: \text{MI}(U, V) = \sum_{i=1}^|U| \sum_{j=1}^|V| \frac{|U_i \cap V_j|}{N}\log\left(\frac{N|U_i \cap V_j|}{|U_i||V_j|}\right)
+.. math:: \text{MI}(U, V) = \sum_{i=1}^{|U|} \sum_{j=1}^{|V|} \frac{|U_i \cap V_j|}{N}\log\left(\frac{N|U_i \cap V_j|}{|U_i||V_j|}\right)
 
 The normalized mutual information is defined as
 
-- 
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