http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/ce452ddb/userguide/eval/lr_datagen.html
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diff --git a/userguide/eval/lr_datagen.html b/userguide/eval/lr_datagen.html
index d820c94..8e18f83 100644
--- a/userguide/eval/lr_datagen.html
+++ b/userguide/eval/lr_datagen.html
@@ -125,7 +125,7 @@
     
         
         <li>
-            <a href="http://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
+            <a href="https://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
         </li>
     
     
@@ -2293,7 +2293,7 @@
 
 </div><!-- tocstop -->
 <h1 id="create-a-dual-table">create a dual table</h1>
-<p>Create a <a href="http://en.wikipedia.org/wiki/DUAL_table"; 
target="_blank">dual table</a> as follows:</p>
+<p>Create a <a href="https://en.wikipedia.org/wiki/DUAL_table"; 
target="_blank">dual table</a> as follows:</p>
 <pre><code class="lang-sql"><span class="hljs-keyword">CREATE</span> <span 
class="hljs-keyword">TABLE</span> dual (
   dummy <span class="hljs-built_in">int</span>
 );
@@ -2424,7 +2424,7 @@ 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/ce452ddb/userguide/eval/multilabel_classification_measures.html
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diff --git a/userguide/eval/multilabel_classification_measures.html 
b/userguide/eval/multilabel_classification_measures.html
index f8e1a31..2e9e9f0 100644
--- a/userguide/eval/multilabel_classification_measures.html
+++ b/userguide/eval/multilabel_classification_measures.html
@@ -125,7 +125,7 @@
     
         
         <li>
-            <a href="http://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
+            <a href="https://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
         </li>
     
     
@@ -2475,7 +2475,7 @@ 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/ce452ddb/userguide/eval/rank.html
----------------------------------------------------------------------
diff --git a/userguide/eval/rank.html b/userguide/eval/rank.html
index 9e7fce9..1d5bab9 100644
--- a/userguide/eval/rank.html
+++ b/userguide/eval/rank.html
@@ -125,7 +125,7 @@
     
         
         <li>
-            <a href="http://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
+            <a href="https://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
         </li>
     
     
@@ -2771,7 +2771,7 @@ 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/ce452ddb/userguide/eval/regression.html
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diff --git a/userguide/eval/regression.html b/userguide/eval/regression.html
index bb8c64f..8514a34 100644
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+++ b/userguide/eval/regression.html
@@ -125,7 +125,7 @@
     
         
         <li>
-            <a href="http://hivemall.incubator.apache.org/"; target="_blank" 
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+            <a href="https://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
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@@ -2340,7 +2340,7 @@
 </blockquote>
 <h1 id="references">References</h1>
 <ul>
-<li>R2 <a href="http://en.wikipedia.org/wiki/Coefficient_of_determination"; 
target="_blank">http://en.wikipedia.org/wiki/Coefficient_of_determination</a></li>
+<li>R2 <a href="https://en.wikipedia.org/wiki/Coefficient_of_determination"; 
target="_blank">https://en.wikipedia.org/wiki/Coefficient_of_determination</a></li>
 <li>Evaluation Metrics <a href="https://www.kaggle.com/wiki/Metrics"; 
target="_blank">https://www.kaggle.com/wiki/Metrics</a></li>
 </ul>
 <p><div id="page-footer" class="localized-footer"><hr><!--
@@ -2398,7 +2398,7 @@ 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/ce452ddb/userguide/ft_engineering/pairing.html
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diff --git a/userguide/ft_engineering/pairing.html 
b/userguide/ft_engineering/pairing.html
index 82ded3f..1949ed7 100644
--- a/userguide/ft_engineering/pairing.html
+++ b/userguide/ft_engineering/pairing.html
@@ -125,7 +125,7 @@
     
         
         <li>
-            <a href="http://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
+            <a href="https://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
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@@ -2336,7 +2336,7 @@ 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/ce452ddb/userguide/ft_engineering/polynomial.html
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diff --git a/userguide/ft_engineering/polynomial.html 
b/userguide/ft_engineering/polynomial.html
index b0130e6..43e1d9e 100644
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@@ -125,7 +125,7 @@
     
         
         <li>
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class="custom-link"><i class="fa fa-home"></i> Home</a>
+            <a href="https://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
         </li>
     
     
@@ -2289,10 +2289,10 @@
 </ul>
 
 </div><!-- tocstop -->
-<p><a href="http://en.wikipedia.org/wiki/Polynomial_kernel"; 
target="_blank">Polynomial features</a> allows you to do <a 
href="https://class.coursera.org/ml-005/lecture/23"; target="_blank">non-linear 
regression</a>/classification with a linear model.</p>
+<p><a href="https://en.wikipedia.org/wiki/Polynomial_kernel"; 
target="_blank">Polynomial features</a> allows you to do <a 
href="https://class.coursera.org/ml-005/lecture/23"; target="_blank">non-linear 
regression</a>/classification with a linear model.</p>
 <div class="panel panel-warning"><div class="panel-heading"><h3 
class="panel-title" id="caution"><i class="fa fa-exclamation-triangle"></i> 
Caution</h3></div><div class="panel-body"><p>Polynomial Features assumes 
normalized inputs because <code>x**n</code> easily becomes INF/-INF where 
<code>n</code> is large.</p></div></div>
 <h1 id="polynomial-features">Polynomial Features</h1>
-<p>As <a 
href="http://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.PolynomialFeatures.html";
 target="_blank">a similar to one in Scikit-Learn</a>, 
<code>polynomial_feature(array&lt;String&gt; features, int degree [, boolean 
interactionOnly=false, boolean truncate=true])</code> is a function to generate 
polynomial and interaction features.</p>
+<p>As <a 
href="https://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.PolynomialFeatures.html";
 target="_blank">a similar to one in Scikit-Learn</a>, 
<code>polynomial_feature(array&lt;String&gt; features, int degree [, boolean 
interactionOnly=false, boolean truncate=true])</code> is a function to generate 
polynomial and interaction features.</p>
 <pre><code class="lang-sql">select 
polynomial_features(array(&quot;a:0.5&quot;,&quot;b:0.2&quot;), 2);
 &gt; 
[&quot;a:0.5&quot;,&quot;a^a:0.25&quot;,&quot;a^b:0.1&quot;,&quot;b:0.2&quot;,&quot;b^b:0.040000003&quot;]
 
@@ -2384,7 +2384,7 @@ Apache Hivemall is an effort undergoing incubation at The 
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diff --git a/userguide/ft_engineering/quantify.html 
b/userguide/ft_engineering/quantify.html
index ce83b6f..14f8e7b 100644
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/ce452ddb/userguide/ft_engineering/scaling.html
----------------------------------------------------------------------
diff --git a/userguide/ft_engineering/scaling.html 
b/userguide/ft_engineering/scaling.html
index 4232ace..8869b7b 100644
--- a/userguide/ft_engineering/scaling.html
+++ b/userguide/ft_engineering/scaling.html
@@ -125,7 +125,7 @@
     
         
         <li>
-            <a href="http://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
+            <a href="https://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
         </li>
     
     
@@ -2305,7 +2305,7 @@
 <p>[&quot;apple:0.8944272&quot;,&quot;banana:0.4472136&quot;]</p>
 </blockquote>
 <h1 id="min-max-normalization">Min-Max Normalization</h1>
-<p><a href="http://en.wikipedia.org/wiki/Feature_scaling#Rescaling"; 
target="_blank">http://en.wikipedia.org/wiki/Feature_scaling#Rescaling</a></p>
+<p><a href="https://en.wikipedia.org/wiki/Feature_scaling#Rescaling"; 
target="_blank">https://en.wikipedia.org/wiki/Feature_scaling#Rescaling</a></p>
 <pre><code class="lang-sql"><span class="hljs-keyword">select</span> <span 
class="hljs-keyword">min</span>(target), <span 
class="hljs-keyword">max</span>(target)
 <span class="hljs-keyword">from</span> (
 <span class="hljs-keyword">select</span> target <span 
class="hljs-keyword">from</span> e2006tfidf_train 
@@ -2329,7 +2329,7 @@
   e2006tfidf_train;
 </code></pre>
 <h1 id="feature-scaling-by-zscore">Feature scaling by zscore</h1>
-<p><a href="http://en.wikipedia.org/wiki/Standard_score"; 
target="_blank">http://en.wikipedia.org/wiki/Standard_score</a></p>
+<p><a href="https://en.wikipedia.org/wiki/Standard_score"; 
target="_blank">https://en.wikipedia.org/wiki/Standard_score</a></p>
 <pre><code class="lang-sql"><span class="hljs-keyword">select</span> <span 
class="hljs-keyword">avg</span>(target), <span 
class="hljs-keyword">stddev_pop</span>(target)
 <span class="hljs-keyword">from</span> (
 <span class="hljs-keyword">select</span> target <span 
class="hljs-keyword">from</span> e2006tfidf_train 
@@ -2511,7 +2511,7 @@ Apache Hivemall is an effort undergoing incubation at The 
Apache Software Founda
     <script>
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/ce452ddb/userguide/ft_engineering/selection.html
----------------------------------------------------------------------
diff --git a/userguide/ft_engineering/selection.html 
b/userguide/ft_engineering/selection.html
index 2787632..c5a99f6 100644
--- a/userguide/ft_engineering/selection.html
+++ b/userguide/ft_engineering/selection.html
@@ -125,7 +125,7 @@
     
         
         <li>
-            <a href="http://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
+            <a href="https://hivemall.incubator.apache.org/"; target="_blank" 
class="custom-link"><i class="fa fa-home"></i> Home</a>
         </li>
     
     
@@ -2306,7 +2306,7 @@
 <h1 id="supported-feature-selection-algorithms">Supported Feature Selection 
algorithms</h1>
 <ul>
 <li>Chi-square (Chi2)<ul>
-<li>In statistics, the <span class="katex"><span 
class="katex-mathml"><math><semantics><mrow><msup><mi>&#x3C7;</mi><mn>2</mn></msup></mrow><annotation
 
encoding="application/x-tex">\chi^2</annotation></semantics></math></span><span 
class="katex-html" aria-hidden="true"><span class="strut" 
style="height:0.8141079999999999em;"></span><span class="strut bottom" 
style="height:1.008548em;vertical-align:-0.19444em;"></span><span class="base 
textstyle uncramped"><span class="mord"><span class="mord 
mathit">&#x3C7;</span><span class="msupsub"><span class="vlist"><span 
style="top:-0.363em;margin-right:0.05em;"><span class="fontsize-ensurer 
reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span 
class="reset-textstyle scriptstyle uncramped mtight"><span class="mord mathrm 
mtight">2</span></span></span><span class="baseline-fix"><span 
class="fontsize-ensurer reset-size5 size5"><span 
style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span></span></spa
 n></span> test is applied to test the independence of two even events. 
Chi-square statistics between every feature variable and the target variable 
can be applied to Feature Selection. Refer <a 
href="http://nlp.stanford.edu/IR-book/html/htmledition/feature-selectionchi2-feature-selection-1.html";
 target="_blank">this article</a> for Mathematical details.</li>
+<li>In statistics, the <span class="katex"><span 
class="katex-mathml"><math><semantics><mrow><msup><mi>&#x3C7;</mi><mn>2</mn></msup></mrow><annotation
 
encoding="application/x-tex">\chi^2</annotation></semantics></math></span><span 
class="katex-html" aria-hidden="true"><span class="strut" 
style="height:0.8141079999999999em;"></span><span class="strut bottom" 
style="height:1.008548em;vertical-align:-0.19444em;"></span><span class="base 
textstyle uncramped"><span class="mord"><span class="mord 
mathit">&#x3C7;</span><span class="msupsub"><span class="vlist"><span 
style="top:-0.363em;margin-right:0.05em;"><span class="fontsize-ensurer 
reset-size5 size5"><span style="font-size:0em;">&#x200B;</span></span><span 
class="reset-textstyle scriptstyle uncramped mtight"><span class="mord mathrm 
mtight">2</span></span></span><span class="baseline-fix"><span 
class="fontsize-ensurer reset-size5 size5"><span 
style="font-size:0em;">&#x200B;</span></span>&#x200B;</span></span></span></span></span></spa
 n></span> test is applied to test the independence of two even events. 
Chi-square statistics between every feature variable and the target variable 
can be applied to Feature Selection. Refer <a 
href="https://nlp.stanford.edu/IR-book/html/htmledition/feature-selectionchi2-feature-selection-1.html";
 target="_blank">this article</a> for Mathematical details.</li>
 </ul>
 </li>
 <li>Signal Noise Ratio (SNR)<ul>
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