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b/userguide/supervised_learning/prediction.html
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@@ -715,14 +715,45 @@
             
         </li>
     
-        <li class="chapter " data-level="3.7" 
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+        <li class="chapter " data-level="3.7" 
data-path="../ft_engineering/term_vector.html">
             
-                <a href="../ft_engineering/tfidf.html">
+                <a href="../ft_engineering/term_vector.html">
             
                     
                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
data-path="../ft_engineering/bm25.html">
+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
         <li class="header">Part IV - Evaluation</li>
@@ -2529,7 +2565,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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diff --git a/userguide/supervised_learning/tutorial.html 
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         </li>
     
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data-path="../ft_engineering/term_vector.html">
             
-                <a href="../ft_engineering/tfidf.html">
+                <a href="../ft_engineering/term_vector.html">
             
                     
                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
data-path="../ft_engineering/bm25.html">
+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
         <li class="header">Part IV - Evaluation</li>
@@ -2907,7 +2943,7 @@ 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/0e287d3d/userguide/tips/addbias.html
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diff --git a/userguide/tips/addbias.html b/userguide/tips/addbias.html
index 8c6b2d3..0629079 100644
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@@ -715,14 +715,45 @@
             
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-                <a href="../ft_engineering/tfidf.html">
+                <a href="../ft_engineering/term_vector.html">
             
                     
                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
data-path="../ft_engineering/bm25.html">
+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
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@@ -2370,7 +2406,7 @@ Apache Hivemall is an effort undergoing incubation at The 
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                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
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+                    
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@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
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-                    TF-IDF Calculation
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+                </a>
+            
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+                <a href="../ft_engineering/tfidf.html">
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+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
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+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
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                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
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@@ -731,6 +762,11 @@
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                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
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+    
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+            
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+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/tips/index.html
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diff --git a/userguide/tips/index.html b/userguide/tips/index.html
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@@ -715,14 +715,45 @@
             
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                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
data-path="../ft_engineering/bm25.html">
+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
         <li class="header">Part IV - Evaluation</li>
@@ -2336,7 +2372,7 @@ 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/0e287d3d/userguide/tips/mixserver.html
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diff --git a/userguide/tips/mixserver.html b/userguide/tips/mixserver.html
index 248b0c1..c78b2fc 100644
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-                <a href="../ft_engineering/tfidf.html">
+                <a href="../ft_engineering/term_vector.html">
             
                     
                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
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+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
         <li class="header">Part IV - Evaluation</li>
@@ -2391,7 +2427,7 @@ 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/0e287d3d/userguide/tips/rand_amplify.html
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diff --git a/userguide/tips/rand_amplify.html b/userguide/tips/rand_amplify.html
index e12f5f9..32d2f25 100644
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+++ b/userguide/tips/rand_amplify.html
@@ -715,14 +715,45 @@
             
         </li>
     
-        <li class="chapter " data-level="3.7" 
data-path="../ft_engineering/tfidf.html">
+        <li class="chapter " data-level="3.7" 
data-path="../ft_engineering/term_vector.html">
             
-                <a href="../ft_engineering/tfidf.html">
+                <a href="../ft_engineering/term_vector.html">
             
                     
                         <b>3.7.</b>
                     
-                    TF-IDF Calculation
+                    Term Vector Model
+            
+                </a>
+            
+
+            
+            <ul class="articles">
+                
+    
+        <li class="chapter " data-level="3.7.1" 
data-path="../ft_engineering/tfidf.html">
+            
+                <a href="../ft_engineering/tfidf.html">
+            
+                    
+                        <b>3.7.1.</b>
+                    
+                    TF-IDF Term Weighting
+            
+                </a>
+            
+
+            
+        </li>
+    
+        <li class="chapter " data-level="3.7.2" 
data-path="../ft_engineering/bm25.html">
+            
+                <a href="../ft_engineering/bm25.html">
+            
+                    
+                        <b>3.7.2.</b>
+                    
+                    Okapi BM25 Term Weighting
             
                 </a>
             
@@ -731,6 +762,11 @@
         </li>
     
 
+            </ul>
+            
+        </li>
+    
+
     
         
         <li class="header">Part IV - Evaluation</li>
@@ -2438,7 +2474,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
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