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	<title>Mars Opinion &#187; 算法</title>
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	<description>不安于当前事务，却倾心于现世光色，对于一切成例与观念皆十分怀疑，却常常为人生远景而凝眸。</description>
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		<title>前言&#8212;&#8212;电子商务商品推荐算法科普</title>
		<link>http://www.marsopinion.com/2008/04/20/%e5%89%8d%e8%a8%80%e7%94%b5%e5%ad%90%e5%95%86%e5%8a%a1%e5%95%86%e5%93%81%e6%8e%a8%e8%8d%90%e7%ae%97%e6%b3%95%e7%a7%91%e6%99%ae/</link>
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		<pubDate>Mon, 21 Apr 2008 04:25:29 +0000</pubDate>
		<dc:creator>MarsOcean</dc:creator>
				<category><![CDATA[营销的乐趣]]></category>
		<category><![CDATA[思考的乐趣]]></category>
		<category><![CDATA[电子商务]]></category>
		<category><![CDATA[算法]]></category>
		<category><![CDATA[营销]]></category>
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			<content:encoded><![CDATA[<p>&nbsp;</p>
<p>最近比较关注Customer Segmentation和Personalized Recommendation。</p>
<p>国内电子商务圈好像很少提起这件事情（我之前写过<a href="http://www.marsopinion.com/?p=997">Use personalized recommendation algorithm to enhance conversion rate for ecommerce website</a>，不过也没什么反响）……所以随便写点科普一下。</p>
<p>本文大部分知识来自于一份叫做<a href="http://www.cs.helsinki.fi/u/gionis/linden03amazon.pdf">Item-to-Item Collaborative Filtering</a>的文档，如果有条件，建议看原文。</p>
<p>这个文档的好处是：</p>
<ol>
<li>写很短，只有５页，其它相关论文动辄上百页，打印出来都觉得是在浪费森林</li>
<li>写很简单，我这种技术白痴也可以看</li>
<li>号称是Amazon官方算法</li>
</ol>
<p>坏处是：</p>
<ol>
<li>写得很简单，所以有基础的同学们不用看了。真想了解的话可以用英文搜索相关关键词，研究论文还是很多的</li>
<li>2003年出的，比较古老</li>
</ol>
<p>　</p>
<p>文章主要比较了三种算法：</p>
<ul>
<li>Collaborative Filtering
<li>Cluster models
<li>Item-to-Item Collaborative Filtering</li>
</ul>
<p>下面分几个post来详细说：</p>
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