http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/getting_started/permanent-functions.html
----------------------------------------------------------------------
diff --git a/userguide/getting_started/permanent-functions.html 
b/userguide/getting_started/permanent-functions.html
index aacb8cb..131d9aa 100644
--- a/userguide/getting_started/permanent-functions.html
+++ b/userguide/getting_started/permanent-functions.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
             
@@ -1752,7 +1810,7 @@ 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/gitbook/gitbook-plugin-splitter/splitter.js
----------------------------------------------------------------------
diff --git a/userguide/gitbook/gitbook-plugin-splitter/splitter.js 
b/userguide/gitbook/gitbook-plugin-splitter/splitter.js
index df95e6d..5034e5b 100644
--- a/userguide/gitbook/gitbook-plugin-splitter/splitter.js
+++ b/userguide/gitbook/gitbook-plugin-splitter/splitter.js
@@ -1,6 +1,12 @@
-/// <reference path="../typings/tsd.d.ts" />
-
 require(['gitbook', 'jQuery'], function (gitbook, $) {
+  
+       // MEMO:
+       // Gitbook is calculated as "calc (100% - 60px)" in the horizontal 
width when the width of the screen size is 600px
+       // or less.
+       // In this case, since contradiction occurs in the implementation of 
this module, return.
+       if($(window).width() <= 600) {
+               return;
+       }
 
        gitbook.events.bind('start', function () {
        });
@@ -30,7 +36,7 @@ require(['gitbook', 'jQuery'], function (gitbook, $) {
                dividerWidth = $divider.outerWidth();
                dividerCenterOffsetLeft = $divider.outerWidth() / 2;
 
-               // restore split state from localStrage
+               // restore split state from sessionStorage
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                setSplitState(
                        splitState.summaryWidth,
@@ -92,7 +98,7 @@ require(['gitbook', 'jQuery'], function (gitbook, $) {
                });
 
                function getSplitState() {
-                       var splitState = 
JSON.parse(localStorage.getItem(KEY_SPLIT_STATE));
+                       var splitState = 
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                        splitState || (splitState = {});
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                        splitState.summaryOffset || (splitState.summaryOffset = 
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@@ -101,7 +107,7 @@ require(['gitbook', 'jQuery'], function (gitbook, $) {
                }
 
                function saveSplitState(summaryWidth, summaryWidthOffset, 
bookBodyOffset) {
-                       localStorage.setItem(KEY_SPLIT_STATE, JSON.stringify({
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                                bookBodyOffset: bookBodyOffset,

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/index.html
----------------------------------------------------------------------
diff --git a/userguide/index.html b/userguide/index.html
index e48688d..659e6b2 100644
--- a/userguide/index.html
+++ b/userguide/index.html
@@ -1580,16 +1580,59 @@
 
     
         
+        <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
             
@@ -1599,12 +1642,12 @@
             
         </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
             
@@ -1745,7 +1788,7 @@ 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/misc/generic_funcs.html
----------------------------------------------------------------------
diff --git a/userguide/misc/generic_funcs.html 
b/userguide/misc/generic_funcs.html
index cdf7eca..1c57329 100644
--- a/userguide/misc/generic_funcs.html
+++ b/userguide/misc/generic_funcs.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" >
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-                        <b>10.2.</b>
+                        <b>11.2.</b>
                     
                     Hivemall on Apache Pig
             
@@ -1916,7 +1974,7 @@ Apache Hivemall is an effort undergoing incubation at The 
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@@ -1567,16 +1582,59 @@
 
     
         
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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/multiclass/iris.html
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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/multiclass/iris_dataset.html
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+++ b/userguide/multiclass/iris_dataset.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
+            
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+            
+
+            
+        </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">
+            
+                    
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+                    
+                    Generic features
+            
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+            
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+            
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+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
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+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
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+        <li class="chapter " data-level="11.1" >
             
                 <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>
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                     Hivemall on Apache Pig
             
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/multiclass/iris_randomforest.html
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diff --git a/userguide/multiclass/iris_randomforest.html 
b/userguide/multiclass/iris_randomforest.html
index c03d682..e7af827 100644
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+++ b/userguide/multiclass/iris_randomforest.html
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+                        <b>3.5.</b>
+                    
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+            
+                </a>
+            
+
+            
+        </li>
+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
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+        
+    
+        <li class="chapter " data-level="10.1" 
data-path="../spark/misc/misc.html">
+            
+                <a href="../spark/misc/misc.html">
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+                    
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+            
+                </a>
+            
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+            <ul class="articles">
+                
+    
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+            
+                    
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+                    
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+            
+
+            
+        </li>
+    
+
+            </ul>
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+
+    
+        
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href="https://github.com/maropu/hivemall-spark";>
             
                     
-                        <b>10.1.</b>
+                        <b>11.1.</b>
                     
                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
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-                        <b>10.2.</b>
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/multiclass/iris_scw.html
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diff --git a/userguide/multiclass/iris_scw.html 
b/userguide/multiclass/iris_scw.html
index 69ffd3d..3c4c7df 100644
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+++ b/userguide/multiclass/iris_scw.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">
+                
+    
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+            
+                <a href="../spark/misc/topk_join.html">
+            
+                    
+                        <b>10.1.1.</b>
+                    
+                    Top-k Join processing
+            
+                </a>
+            
+
+            
+        </li>
+    
+
+            </ul>
+            
+        </li>
+    
+
+    
+        
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-                        <b>10.1.</b>
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                     Hivemall on Apache Spark
             
@@ -1586,12 +1644,12 @@
             
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-                        <b>10.2.</b>
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@@ -1985,7 +2043,7 @@ Apache Hivemall is an effort undergoing incubation at The 
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/990fed4a/userguide/multiclass/news20.html
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+            
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+            
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+    
 
     
         
@@ -1567,16 +1582,59 @@
 
     
         
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+            
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+            <ul class="articles">
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