http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/sitemap.xml
----------------------------------------------------------------------
diff --git a/userguide/sitemap.xml b/userguide/sitemap.xml
index f4157b2..1984482 100644
--- a/userguide/sitemap.xml
+++ b/userguide/sitemap.xml
@@ -35,7 +35,9 @@
 <url> 
<loc>https://hivemall.incubator.apache.org/ft_engineering/ft_trans.html</loc> 
<changefreq>weekly</changefreq> <priority>0.5</priority> </url>
 <url> 
<loc>https://hivemall.incubator.apache.org/ft_engineering/vectorization.html</loc>
 <changefreq>weekly</changefreq> <priority>0.5</priority> </url>
 <url> 
<loc>https://hivemall.incubator.apache.org/ft_engineering/quantify.html</loc> 
<changefreq>weekly</changefreq> <priority>0.5</priority> </url>
+<url> 
<loc>https://hivemall.incubator.apache.org/ft_engineering/term_vector.html</loc>
 <changefreq>weekly</changefreq> <priority>0.5</priority> </url>
 <url> 
<loc>https://hivemall.incubator.apache.org/ft_engineering/tfidf.html</loc> 
<changefreq>weekly</changefreq> <priority>0.5</priority> </url>
+<url> 
<loc>https://hivemall.incubator.apache.org/ft_engineering/bm25.html</loc> 
<changefreq>weekly</changefreq> <priority>0.5</priority> </url>
 <url> 
<loc>https://hivemall.incubator.apache.org/eval/binary_classification_measures.html</loc>
 <changefreq>weekly</changefreq> <priority>0.5</priority> </url>
 <url> <loc>https://hivemall.incubator.apache.org/eval/auc.html</loc> 
<changefreq>weekly</changefreq> <priority>0.5</priority> </url>
 <url> 
<loc>https://hivemall.incubator.apache.org/eval/multilabel_classification_measures.html</loc>
 <changefreq>weekly</changefreq> <priority>0.5</priority> </url>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/binaryclass/a9a_df.html
----------------------------------------------------------------------
diff --git a/userguide/spark/binaryclass/a9a_df.html 
b/userguide/spark/binaryclass/a9a_df.html
index 1ca59ce..9e64391 100644
--- a/userguide/spark/binaryclass/a9a_df.html
+++ b/userguide/spark/binaryclass/a9a_df.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>
@@ -2401,7 +2437,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"a9a tutorial for 
DataFrame","level":"13.2.1","depth":2,"next":{"title":"a9a tutorial for 
SQL","level":"13.2.2","depth":2,"path":"spark/binaryclass/a9a_sql.md","ref":"spark/binaryclass/a9a_sql.md","articles":[]},"previous":{"title":"Binary
 
Classification","level":"13.2","depth":1,"path":"spark/binaryclass/index.md","ref":"spark/binaryclass/index.md","articles":[{"title":"a9a
 tutorial for 
DataFrame","level":"13.2.1","depth":2,"path":"spark/binaryclass/a9a_df.md","ref":"spark/binaryclass/a9a_df.md","articles":[]},{"title":"a9a
 tutorial for 
SQL","level":"13.2.2","depth":2,"path":"spark/binaryclass/a9a_sql.md","ref":"spark/binaryclass/a9a_sql.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styl
 
es/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","i
 
nstapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/binaryclass/a9a_df.md","mtime":
 
"2018-09-07T06:02:35.260Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"a9a tutorial for 
DataFrame","level":"13.2.1","depth":2,"next":{"title":"a9a tutorial for 
SQL","level":"13.2.2","depth":2,"path":"spark/binaryclass/a9a_sql.md","ref":"spark/binaryclass/a9a_sql.md","articles":[]},"previous":{"title":"Binary
 
Classification","level":"13.2","depth":1,"path":"spark/binaryclass/index.md","ref":"spark/binaryclass/index.md","articles":[{"title":"a9a
 tutorial for 
DataFrame","level":"13.2.1","depth":2,"path":"spark/binaryclass/a9a_df.md","ref":"spark/binaryclass/a9a_df.md","articles":[]},{"title":"a9a
 tutorial for 
SQL","level":"13.2.2","depth":2,"path":"spark/binaryclass/a9a_sql.md","ref":"spark/binaryclass/a9a_sql.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styl
 
es/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","i
 
nstapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/binaryclass/a9a_df.md","mtime":
 
"2018-11-02T12:52:57.594Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/binaryclass/a9a_sql.html
----------------------------------------------------------------------
diff --git a/userguide/spark/binaryclass/a9a_sql.html 
b/userguide/spark/binaryclass/a9a_sql.html
index ccbf238..0a8fe8e 100644
--- a/userguide/spark/binaryclass/a9a_sql.html
+++ b/userguide/spark/binaryclass/a9a_sql.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>
@@ -2459,7 +2495,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"a9a tutorial for 
SQL","level":"13.2.2","depth":2,"next":{"title":"Regression","level":"13.3","depth":1,"path":"spark/binaryclass/index.md","ref":"spark/binaryclass/index.md","articles":[{"title":"E2006-tfidf
 regression tutorial for 
DataFrame","level":"13.3.1","depth":2,"path":"spark/regression/e2006_df.md","ref":"spark/regression/e2006_df.md","articles":[]},{"title":"E2006-tfidf
 regression tutorial for 
SQL","level":"13.3.2","depth":2,"path":"spark/regression/e2006_sql.md","ref":"spark/regression/e2006_sql.md","articles":[]}]},"previous":{"title":"a9a
 tutorial for 
DataFrame","level":"13.2.1","depth":2,"path":"spark/binaryclass/a9a_df.md","ref":"spark/binaryclass/a9a_df.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-foote
 
r"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook";,
 
"google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache Hivemall"},"file":{"path":"spark/bi
 
naryclass/a9a_sql.md","mtime":"2018-09-07T06:02:35.260Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"a9a tutorial for 
SQL","level":"13.2.2","depth":2,"next":{"title":"Regression","level":"13.3","depth":1,"path":"spark/binaryclass/index.md","ref":"spark/binaryclass/index.md","articles":[{"title":"E2006-tfidf
 regression tutorial for 
DataFrame","level":"13.3.1","depth":2,"path":"spark/regression/e2006_df.md","ref":"spark/regression/e2006_df.md","articles":[]},{"title":"E2006-tfidf
 regression tutorial for 
SQL","level":"13.3.2","depth":2,"path":"spark/regression/e2006_sql.md","ref":"spark/regression/e2006_sql.md","articles":[]}]},"previous":{"title":"a9a
 tutorial for 
DataFrame","level":"13.2.1","depth":2,"path":"spark/binaryclass/a9a_df.md","ref":"spark/binaryclass/a9a_df.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-foote
 
r"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook";,
 
"google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache Hivemall"},"file":{"path":"spark/bi
 
naryclass/a9a_sql.md","mtime":"2018-11-02T12:52:57.594Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/binaryclass/index.html
----------------------------------------------------------------------
diff --git a/userguide/spark/binaryclass/index.html 
b/userguide/spark/binaryclass/index.html
index d9d93af..607fe7c 100644
--- a/userguide/spark/binaryclass/index.html
+++ b/userguide/spark/binaryclass/index.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>
@@ -2336,7 +2372,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Binary 
Classification","level":"13.2","depth":1,"next":{"title":"a9a tutorial for 
DataFrame","level":"13.2.1","depth":2,"path":"spark/binaryclass/a9a_df.md","ref":"spark/binaryclass/a9a_df.md","articles":[]},"previous":{"title":"Installation","level":"13.1.1","depth":2,"path":"spark/getting_started/installation.md","ref":"spark/getting_started/installation.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github
 
.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"s
 
tyles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/binaryclass/index.md","mtime":"2018-08-29T08:55:00.293Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Binary 
Classification","level":"13.2","depth":1,"next":{"title":"a9a tutorial for 
DataFrame","level":"13.2.1","depth":2,"path":"spark/binaryclass/a9a_df.md","ref":"spark/binaryclass/a9a_df.md","articles":[]},"previous":{"title":"Installation","level":"13.1.1","depth":2,"path":"spark/getting_started/installation.md","ref":"spark/getting_started/installation.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github
 
.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"s
 
tyles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/binaryclass/index.md","mtime":"2017-11-02T05:41:05.000Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/getting_started/index.html
----------------------------------------------------------------------
diff --git a/userguide/spark/getting_started/index.html 
b/userguide/spark/getting_started/index.html
index b4d0f90..a340bb7 100644
--- a/userguide/spark/getting_started/index.html
+++ b/userguide/spark/getting_started/index.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>
@@ -2337,7 +2373,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Getting 
Started","level":"13.1","depth":1,"next":{"title":"Installation","level":"13.1.1","depth":2,"path":"spark/getting_started/installation.md","ref":"spark/getting_started/installation.md","articles":[]},"previous":{"title":"Lat/Lon
 
functions","level":"12.1","depth":1,"path":"geospatial/latlon.md","ref":"geospatial/latlon.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/
 
"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":t
 rue},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout) > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/getting_started/README.md","mtime":"2018-08-29T08:55:00.294Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Getting 
Started","level":"13.1","depth":1,"next":{"title":"Installation","level":"13.1.1","depth":2,"path":"spark/getting_started/installation.md","ref":"spark/getting_started/installation.md","articles":[]},"previous":{"title":"Lat/Lon
 
functions","level":"12.1","depth":1,"path":"geospatial/latlon.md","ref":"geospatial/latlon.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/
 
"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":t
 rue},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout) > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/getting_started/README.md","mtime":"2017-11-02T05:41:05.000Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/getting_started/installation.html
----------------------------------------------------------------------
diff --git a/userguide/spark/getting_started/installation.html 
b/userguide/spark/getting_started/installation.html
index 1b14f7a..10cf168 100644
--- a/userguide/spark/getting_started/installation.html
+++ b/userguide/spark/getting_started/installation.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>
@@ -2360,7 +2396,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            
gitbook.page.hasChanged({"page":{"title":"Installation","level":"13.1.1","depth":2,"next":{"title":"Binary
 
Classification","level":"13.2","depth":1,"path":"spark/binaryclass/index.md","ref":"spark/binaryclass/index.md","articles":[{"title":"a9a
 tutorial for 
DataFrame","level":"13.2.1","depth":2,"path":"spark/binaryclass/a9a_df.md","ref":"spark/binaryclass/a9a_df.md","articles":[]},{"title":"a9a
 tutorial for 
SQL","level":"13.2.2","depth":2,"path":"spark/binaryclass/a9a_sql.md","ref":"spark/binaryclass/a9a_sql.md","articles":[]}]},"previous":{"title":"Getting
 
Started","level":"13.1","depth":1,"path":"spark/getting_started/README.md","ref":"spark/getting_started/README.md","articles":[{"title":"Installation","level":"13.1.1","depth":2,"path":"spark/getting_started/installation.md","ref":"spark/getting_started/installation.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs
 
","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"shar
 
ing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.in
 cubator.apache.org/"}},"gitbook":"3.x.x","description":"User Manual for Apache 
Hivemall"},"file":{"path":"spark/getting_started/installation.md","mtime":"2018-09-07T06:02:35.261Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            
gitbook.page.hasChanged({"page":{"title":"Installation","level":"13.1.1","depth":2,"next":{"title":"Binary
 
Classification","level":"13.2","depth":1,"path":"spark/binaryclass/index.md","ref":"spark/binaryclass/index.md","articles":[{"title":"a9a
 tutorial for 
DataFrame","level":"13.2.1","depth":2,"path":"spark/binaryclass/a9a_df.md","ref":"spark/binaryclass/a9a_df.md","articles":[]},{"title":"a9a
 tutorial for 
SQL","level":"13.2.2","depth":2,"path":"spark/binaryclass/a9a_sql.md","ref":"spark/binaryclass/a9a_sql.md","articles":[]}]},"previous":{"title":"Getting
 
Started","level":"13.1","depth":1,"path":"spark/getting_started/README.md","ref":"spark/getting_started/README.md","articles":[{"title":"Installation","level":"13.1.1","depth":2,"path":"spark/getting_started/installation.md","ref":"spark/getting_started/installation.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs
 
","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"shar
 
ing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.in
 cubator.apache.org/"}},"gitbook":"3.x.x","description":"User Manual for Apache 
Hivemall"},"file":{"path":"spark/getting_started/installation.md","mtime":"2018-11-02T12:52:57.596Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/misc/functions.html
----------------------------------------------------------------------
diff --git a/userguide/spark/misc/functions.html 
b/userguide/spark/misc/functions.html
index 4a68e61..300d48d 100644
--- a/userguide/spark/misc/functions.html
+++ b/userguide/spark/misc/functions.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>
@@ -2416,7 +2452,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Other utility 
functions","level":"13.4.2","depth":2,"next":{"title":"Getting 
Started","level":"14.1","depth":1,"path":"docker/getting_started.md","ref":"docker/getting_started.md","articles":[]},"previous":{"title":"Top-k
 join 
processing","level":"13.4.1","depth":2,"path":"spark/misc/topk_join.md","ref":"spark/misc/topk_join.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/";
 
},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":tr
 ue},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout) > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/misc/functions.md","mtime":"2018-08-29T08:55:00.294Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Other utility 
functions","level":"13.4.2","depth":2,"next":{"title":"Getting 
Started","level":"14.1","depth":1,"path":"docker/getting_started.md","ref":"docker/getting_started.md","articles":[]},"previous":{"title":"Top-k
 join 
processing","level":"13.4.1","depth":2,"path":"spark/misc/topk_join.md","ref":"spark/misc/topk_join.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/";
 
},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":tr
 ue},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout) > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/misc/functions.md","mtime":"2017-11-02T05:41:05.000Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/misc/misc.html
----------------------------------------------------------------------
diff --git a/userguide/spark/misc/misc.html b/userguide/spark/misc/misc.html
index 6f79dc6..e77f976 100644
--- a/userguide/spark/misc/misc.html
+++ b/userguide/spark/misc/misc.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>
@@ -2336,7 +2372,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Generic 
features","level":"13.4","depth":1,"next":{"title":"Top-k join 
processing","level":"13.4.1","depth":2,"path":"spark/misc/topk_join.md","ref":"spark/misc/topk_join.md","articles":[]},"previous":{"title":"E2006-tfidf
 regression tutorial for 
SQL","level":"13.3.2","depth":2,"path":"spark/regression/e2006_sql.md","ref":"spark/regression/e2006_sql.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/ap
 
ache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/p
 rint.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout) 
> 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/misc/misc.md","mtime":"2018-08-29T08:55:00.294Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Generic 
features","level":"13.4","depth":1,"next":{"title":"Top-k join 
processing","level":"13.4.1","depth":2,"path":"spark/misc/topk_join.md","ref":"spark/misc/topk_join.md","articles":[]},"previous":{"title":"E2006-tfidf
 regression tutorial for 
SQL","level":"13.3.2","depth":2,"path":"spark/regression/e2006_sql.md","ref":"spark/regression/e2006_sql.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/ap
 
ache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/p
 rint.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout) 
> 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/misc/misc.md","mtime":"2017-11-02T05:41:05.000Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/misc/topk_join.html
----------------------------------------------------------------------
diff --git a/userguide/spark/misc/topk_join.html 
b/userguide/spark/misc/topk_join.html
index f21ac02..bdd142d 100644
--- a/userguide/spark/misc/topk_join.html
+++ b/userguide/spark/misc/topk_join.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>
@@ -2515,7 +2551,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"Top-k join 
processing","level":"13.4.1","depth":2,"next":{"title":"Other utility 
functions","level":"13.4.2","depth":2,"path":"spark/misc/functions.md","ref":"spark/misc/functions.md","articles":[]},"previous":{"title":"Generic
 
features","level":"13.4","depth":1,"path":"spark/misc/misc.md","ref":"spark/misc/misc.md","articles":[{"title":"Top-k
 join 
processing","level":"13.4.1","depth":2,"path":"spark/misc/topk_join.md","ref":"spark/misc/topk_join.md","articles":[]},{"title":"Other
 utility 
functions","level":"13.4.2","depth":2,"path":"spark/misc/functions.md","ref":"spark/misc/functions.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles
 
/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"http
 
s://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/misc/topk_join.md","mtime":"2018-08-29T08:55:00.294Z","type":"markdown"},"gitbook":{
 
"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"Top-k join 
processing","level":"13.4.1","depth":2,"next":{"title":"Other utility 
functions","level":"13.4.2","depth":2,"path":"spark/misc/functions.md","ref":"spark/misc/functions.md","articles":[]},"previous":{"title":"Generic
 
features","level":"13.4","depth":1,"path":"spark/misc/misc.md","ref":"spark/misc/misc.md","articles":[{"title":"Top-k
 join 
processing","level":"13.4.1","depth":2,"path":"spark/misc/topk_join.md","ref":"spark/misc/topk_join.md","articles":[]},{"title":"Other
 utility 
functions","level":"13.4.2","depth":2,"path":"spark/misc/functions.md","ref":"spark/misc/functions.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles
 
/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"http
 
s://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/misc/topk_join.md","mtime":"2017-11-02T05:41:05.000Z","type":"markdown"},"gitbook":{
 
"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/regression/e2006_df.html
----------------------------------------------------------------------
diff --git a/userguide/spark/regression/e2006_df.html 
b/userguide/spark/regression/e2006_df.html
index 2d98dcf..c89b128 100644
--- a/userguide/spark/regression/e2006_df.html
+++ b/userguide/spark/regression/e2006_df.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>
@@ -2405,7 +2441,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"E2006-tfidf regression 
tutorial for DataFrame","level":"13.3.1","depth":2,"next":{"title":"E2006-tfidf 
regression tutorial for 
SQL","level":"13.3.2","depth":2,"path":"spark/regression/e2006_sql.md","ref":"spark/regression/e2006_sql.md","articles":[]},"previous":{"title":"Regression","level":"13.3","depth":1,"path":"spark/binaryclass/index.md","ref":"spark/binaryclass/index.md","articles":[{"title":"E2006-tfidf
 regression tutorial for 
DataFrame","level":"13.3.1","depth":2,"path":"spark/regression/e2006_df.md","ref":"spark/regression/e2006_df.md","articles":[]},{"title":"E2006-tfidf
 regression tutorial for 
SQL","level":"13.3.2","depth":2,"path":"spark/regression/e2006_sql.md","ref":"spark/regression/e2006_sql.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-file
 
name","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"insta
 
paper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for 
 Apache 
Hivemall"},"file":{"path":"spark/regression/e2006_df.md","mtime":"2018-09-07T06:02:35.261Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"E2006-tfidf regression 
tutorial for DataFrame","level":"13.3.1","depth":2,"next":{"title":"E2006-tfidf 
regression tutorial for 
SQL","level":"13.3.2","depth":2,"path":"spark/regression/e2006_sql.md","ref":"spark/regression/e2006_sql.md","articles":[]},"previous":{"title":"Regression","level":"13.3","depth":1,"path":"spark/binaryclass/index.md","ref":"spark/binaryclass/index.md","articles":[{"title":"E2006-tfidf
 regression tutorial for 
DataFrame","level":"13.3.1","depth":2,"path":"spark/regression/e2006_df.md","ref":"spark/regression/e2006_df.md","articles":[]},{"title":"E2006-tfidf
 regression tutorial for 
SQL","level":"13.3.2","depth":2,"path":"spark/regression/e2006_sql.md","ref":"spark/regression/e2006_sql.md","articles":[]}]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-file
 
name","katex","emphasize","localized-footer"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"insta
 
paper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for 
 Apache 
Hivemall"},"file":{"path":"spark/regression/e2006_df.md","mtime":"2018-11-02T12:52:57.598Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/0e287d3d/userguide/spark/regression/e2006_sql.html
----------------------------------------------------------------------
diff --git a/userguide/spark/regression/e2006_sql.html 
b/userguide/spark/regression/e2006_sql.html
index f22c884..1fcd637 100644
--- a/userguide/spark/regression/e2006_sql.html
+++ b/userguide/spark/regression/e2006_sql.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>
@@ -2451,7 +2487,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
         var gitbook = gitbook || [];
         gitbook.push(function() {
-            gitbook.page.hasChanged({"page":{"title":"E2006-tfidf regression 
tutorial for SQL","level":"13.3.2","depth":2,"next":{"title":"Generic 
features","level":"13.4","depth":1,"path":"spark/misc/misc.md","ref":"spark/misc/misc.md","articles":[{"title":"Top-k
 join 
processing","level":"13.4.1","depth":2,"path":"spark/misc/topk_join.md","ref":"spark/misc/topk_join.md","articles":[]},{"title":"Other
 utility 
functions","level":"13.4.2","depth":2,"path":"spark/misc/functions.md","ref":"spark/misc/functions.md","articles":[]}]},"previous":{"title":"E2006-tfidf
 regression tutorial for 
DataFrame","level":"13.3.1","depth":2,"path":"spark/regression/e2006_df.md","ref":"spark/regression/e2006_df.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/
 
website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","inst
 
apaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/regression/e2006_sql.md","mtime":"
 
2018-09-07T06:02:35.261Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-07T06:06:37.693Z"},"basePath":"../..","book":{"language":""}});
+            gitbook.page.hasChanged({"page":{"title":"E2006-tfidf regression 
tutorial for SQL","level":"13.3.2","depth":2,"next":{"title":"Generic 
features","level":"13.4","depth":1,"path":"spark/misc/misc.md","ref":"spark/misc/misc.md","articles":[{"title":"Top-k
 join 
processing","level":"13.4.1","depth":2,"path":"spark/misc/topk_join.md","ref":"spark/misc/topk_join.md","articles":[]},{"title":"Other
 utility 
functions","level":"13.4.2","depth":2,"path":"spark/misc/functions.md","ref":"spark/misc/functions.md","articles":[]}]},"previous":{"title":"E2006-tfidf
 regression tutorial for 
DataFrame","level":"13.3.1","depth":2,"path":"spark/regression/e2006_df.md","ref":"spark/regression/e2006_df.md","articles":[]},"dir":"ltr"},"config":{"plugins":["theme-api","edit-link","github","splitter","sitemap","etoc","callouts","toggle-chapters","anchorjs","codeblock-filename","expandable-chapters","multipart","codeblock-filename","katex","emphasize","localized-footer"],"styles":{"website":"styles/
 
website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"emphasize":{},"callouts":{},"etoc":{"h2lb":3,"header":1,"maxdepth":3,"mindepth":1,"notoc":true},"github":{"url":"https://github.com/apache/incubator-hivemall/"},"splitter":{},"search":{},"downloadpdf":{"base":"https://github.com/apache/incubator-hivemall/docs/gitbook","label":"PDF","multilingual":false},"multipart":{},"localized-footer":{"filename":"FOOTER.md","hline":"true"},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"katex":{},"fontsettings":{"theme":"white","family":"sans","size":2,"font":"sans"},"highlight":{},"codeblock-filename":{},"sitemap":{"hostname":"https://hivemall.incubator.apache.org/"},"theme-api":{"languages":[],"split":false,"theme":"dark"},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","inst
 
apaper"]},"edit-link":{"label":"Edit","base":"https://github.com/apache/incubator-hivemall/tree/master/docs/gitbook"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":true},"anchorjs":{"selector":"h1,h2,h3,*:not(.callout)
 > 
h4,h5"},"toggle-chapters":{},"expandable-chapters":{}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Hivemall
 User Manual","links":{"sidebar":{"<i class=\"fa fa-home\"></i> 
Home":"https://hivemall.incubator.apache.org/"}},"gitbook":"3.x.x","description":"User
 Manual for Apache 
Hivemall"},"file":{"path":"spark/regression/e2006_sql.md","mtime":"
 
2018-11-02T12:52:57.599Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-11-06T02:51:07.793Z"},"basePath":"../..","book":{"language":""}});
         });
     </script>
 </div>

Reply via email to