{
  "id": 5749,
  "title": "This is a rank problem.",
  "url": "/competitions/expedia-personalized-sort/discussion/5749",
  "author_name": "Emily Y. Lu",
  "post_date": "2013-09-13T12:00:35.657000",
  "votes": 3,
  "comment_count": 0,
  "views": 1372,
  "content": "<p>From wikipedia, there are three types of models to solve rank problem,</p>\n<p>* pointwise</p>\n<p>* pairwise</p>\n<p>* listwise</p>\n<p><a href=\"http://en.wikipedia.org/wiki/Learning_to_rank\">http://en.wikipedia.org/wiki/Learning_to_rank</a></p>\n<p>Also, check this wonderful lemur project webpage.&nbsp; It has implemented almost all methods in java. I have not used it yet. I am a little concerned of the memory and speed. Has anyone already used it?</p>\n<p><a href=\"http://sourceforge.net/p/lemur/wiki/RankLib/\">http://sourceforge.net/p/lemur/wiki/RankLib/</a></p>\n<p>&nbsp;</p>",
  "messages": [
    {
      "id": 30848,
      "postDate": "2013-09-13T12:00:35.657Z",
      "content": "<p>From wikipedia, there are three types of models to solve rank problem,</p>\n<p>* pointwise</p>\n<p>* pairwise</p>\n<p>* listwise</p>\n<p><a href=\"http://en.wikipedia.org/wiki/Learning_to_rank\">http://en.wikipedia.org/wiki/Learning_to_rank</a></p>\n<p>Also, check this wonderful lemur project webpage.&nbsp; It has implemented almost all methods in java. I have not used it yet. I am a little concerned of the memory and speed. Has anyone already used it?</p>\n<p><a href=\"http://sourceforge.net/p/lemur/wiki/RankLib/\">http://sourceforge.net/p/lemur/wiki/RankLib/</a></p>\n<p>&nbsp;</p>",
      "votes": 3
    }
  ],
  "comments": [],
  "raw_markdown_by_id": {
    "30848": ""
  }
}