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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/f8750861/userguide/ft_engineering/scaling.html
----------------------------------------------------------------------
diff --git a/userguide/ft_engineering/scaling.html 
b/userguide/ft_engineering/scaling.html
index b7e55e8..df92305 100644
--- a/userguide/ft_engineering/scaling.html
+++ b/userguide/ft_engineering/scaling.html
@@ -2218,6 +2218,7 @@
 <!-- toc --><div id="toc" class="toc">
 
 <ul>
+<li><a href="#l1l2-normalization">L1/L2 Normalization</a></li>
 <li><a href="#min-max-normalization">Min-Max Normalization</a></li>
 <li><a href="#feature-scaling-by-zscore">Feature scaling by zscore</a></li>
 <li><a href="#apply-normalization-to-more-complex-feature-vector">Apply 
Normalization to more complex feature vector</a></li>
@@ -2225,6 +2226,18 @@
 </ul>
 
 </div><!-- tocstop -->
+<h1 id="l1l2-normalization">L1/L2 Normalization</h1>
+<p><a href="http://mathworld.wolfram.com/L1-Norm.html"; target="_blank">L1</a> 
and <a href="http://mathworld.wolfram.com/L2-Norm.html"; target="_blank">L2</a> 
normalization ensures that each feature vector has unit length:</p>
+<pre><code class="lang-sql"><span class="hljs-keyword">select</span> 
l1_normalize(<span class="hljs-built_in">array</span>(<span 
class="hljs-string">&apos;apple:1.0&apos;</span>, <span 
class="hljs-string">&apos;banana:0.5&apos;</span>))
+</code></pre>
+<blockquote>
+<p>[&quot;apple:0.6666667&quot;,&quot;banana:0.33333334&quot;]</p>
+</blockquote>
+<pre><code class="lang-sql"><span class="hljs-keyword">select</span> 
l2_normalize(<span class="hljs-built_in">array</span>(<span 
class="hljs-string">&apos;apple:1.0&apos;</span>, <span 
class="hljs-string">&apos;banana:0.5&apos;</span>))
+</code></pre>
+<blockquote>
+<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>
 <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)
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http://git-wip-us.apache.org/repos/asf/incubator-hivemall-site/blob/f8750861/userguide/ft_engineering/selection.html
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diff --git a/userguide/ft_engineering/selection.html 
b/userguide/ft_engineering/selection.html
index f5a4136..d65958f 100644
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Apache Software Founda
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