http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/regression/e2006_arow.html
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diff --git a/userguide/regression/e2006_arow.html 
b/userguide/regression/e2006_arow.html
index 21fc16b..a18697c 100644
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+++ b/userguide/regression/e2006_arow.html
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="../ft_engineering/feature_selection.html">
+            
+                <a href="../ft_engineering/feature_selection.html">
+            
+                    
+                        <b>3.5.</b>
+                    
+                    Feature selection
+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="10.1.1" 
data-path="../spark/misc/topk_join.html">
+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
+
+    
+        
         <li class="header">Part X - External References</li>
         
         
     
-        <li class="chapter " data-level="10.1" >
+        <li class="chapter " data-level="11.1" >
             
                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
+                        <b>11.1.</b>
                     
                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
         </li>
     
-        <li class="chapter " data-level="10.2" >
+        <li class="chapter " data-level="11.2" >
             
                 <a target="_blank" 
href="https://github.com/daijyc/hivemall/wiki/PigHome";>
             
                     
-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
                     Hivemall on Apache Pig
             
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+                <a href="../ft_engineering/feature_selection.html">
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+                        <b>3.5.</b>
+                    
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+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
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+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="10.1.1" 
data-path="../spark/misc/topk_join.html">
+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
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+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
+
+    
+        
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-        <li class="chapter " data-level="10.1" >
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                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
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                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
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-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/regression/kddcup12tr2.html
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diff --git a/userguide/regression/kddcup12tr2.html 
b/userguide/regression/kddcup12tr2.html
index f5099fc..2713a8d 100644
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@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="../ft_engineering/feature_selection.html">
+            
+                <a href="../ft_engineering/feature_selection.html">
+            
+                    
+                        <b>3.5.</b>
+                    
+                    Feature selection
+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="10.1.1" 
data-path="../spark/misc/topk_join.html">
+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
+
+    
+        
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-        <li class="chapter " data-level="10.1" >
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href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
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                     Hivemall on Apache Spark
             
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+                        <b>3.5.</b>
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@@ -1567,16 +1582,59 @@
 
     
         
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+            
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@@ -1567,16 +1582,59 @@
 
     
         
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/regression/kddcup12tr2_lr.html
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diff --git a/userguide/regression/kddcup12tr2_lr.html 
b/userguide/regression/kddcup12tr2_lr.html
index 0d0bc63..6a8bfd8 100644
--- a/userguide/regression/kddcup12tr2_lr.html
+++ b/userguide/regression/kddcup12tr2_lr.html
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="../ft_engineering/feature_selection.html">
+            
+                <a href="../ft_engineering/feature_selection.html">
+            
+                    
+                        <b>3.5.</b>
+                    
+                    Feature selection
+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="10.1.1" 
data-path="../spark/misc/topk_join.html">
+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
+
+    
+        
         <li class="header">Part X - External References</li>
         
         
     
-        <li class="chapter " data-level="10.1" >
+        <li class="chapter " data-level="11.1" >
             
                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
+                        <b>11.1.</b>
                     
                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
         </li>
     
-        <li class="chapter " data-level="10.2" >
+        <li class="chapter " data-level="11.2" >
             
                 <a target="_blank" 
href="https://github.com/daijyc/hivemall/wiki/PigHome";>
             
                     
-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
                     Hivemall on Apache Pig
             
@@ -1869,7 +1927,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/regression/kddcup12tr2_lr_amplify.html
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diff --git a/userguide/regression/kddcup12tr2_lr_amplify.html 
b/userguide/regression/kddcup12tr2_lr_amplify.html
index 01e2bbc..1bfa8a5 100644
--- a/userguide/regression/kddcup12tr2_lr_amplify.html
+++ b/userguide/regression/kddcup12tr2_lr_amplify.html
@@ -634,6 +634,21 @@
             
         </li>
     
+        <li class="chapter " data-level="3.5" 
data-path="../ft_engineering/feature_selection.html">
+            
+                <a href="../ft_engineering/feature_selection.html">
+            
+                    
+                        <b>3.5.</b>
+                    
+                    Feature selection
+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
+        <li class="header">Part X - Hivemall on Spark</li>
+        
+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
+            
+                    
+                        <b>10.1.</b>
+                    
+                    Generic features
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="10.1.1" 
data-path="../spark/misc/topk_join.html">
+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
+
+    
+        
         <li class="header">Part X - External References</li>
         
         
     
-        <li class="chapter " data-level="10.1" >
+        <li class="chapter " data-level="11.1" >
             
                 <a target="_blank" 
href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
+                        <b>11.1.</b>
                     
                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
         </li>
     
-        <li class="chapter " data-level="10.2" >
+        <li class="chapter " data-level="11.2" >
             
                 <a target="_blank" 
href="https://github.com/daijyc/hivemall/wiki/PigHome";>
             
                     
-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
                     Hivemall on Apache Pig
             
@@ -1813,7 +1871,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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