zoukankan      html  css  js  c++  java
  • Exercise 8: TF/IDF ranking

     Exercise 8 - TF/IDF ranking

    DIS 2006/2007

    Exercise 8: TF/IDF ranking

    In this exercise we'll have a look at how the TF/IDF ranking works.

    There are 5 different documents in the collection:

    • D1 = "If it walks like a duck and quacks like a duck, it must be a duck."
    • D2 = "Beijing Duck is mostly prized for the thin, crispy duck skin with authentic versions of the dish serving mostly the skin."
    • D3 = "Bugs' ascension to stardom also prompted the Warner animators to recast Daffy Duck as the rabbit's rival, intensely jealous and determined to steal back the spotlight while Bugs remained indifferent to the duck's jealousy, or used it to his advantage. This turned out to be the recipe for the success of the duo."
    • D4 = "6:25 PM 1/7/2007 blog entry: I found this great recipe for Rabbit Braised in Wine on cookingforengineers.com."
    • D5 = "Last week Li has shown you how to make the Sechuan duck. Today we'll be making Chinese dumplings (Jiaozi), a popular dish that I had a chance to try last summer in Beijing. There are many recipies for Jiaozi."

    Task 1. For the query Q = "Beijing duck recipe", find the two top ranked documents according to the TF/IDF rank. Assume the cosine similarity measure and the culinary term set T = {beijing, dish,duck, rabbit, recipe, roast}. Are the top ranked documents relevant to the query?

    Task 2. Assume that the author of the document D5 goes on to tell more about her summer trip to China before doing the cooking and uses the word Beijing 3 times, instead of just once. What happens to the rank of D5? How can this be interpreted in the vector retrieval model (vectors and angles between them)? Is this change in the ranking of D5 a desirable property of TF/IDF? Why?

    Solution

    Excel sheet with calculations

     
  • 相关阅读:
    react结合antd4.0和umi3.0的404界面
    小程序自带组件自定义tabbar
    移动安全学习清单
    跨域资源共享 CORS 详解(转)
    docker常用命令总结
    XSS绕过小结
    mysql的order by注入
    本地文件包含漏洞利用姿势
    XSS绕过<>进行测试
    clamscan+clam-freshclam.service服务启停
  • 原文地址:https://www.cnblogs.com/lexus/p/2698677.html
Copyright © 2011-2022 走看看