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“Wide” format data: a small number of records but a large number of features, the main method to deal with this kind of data is dimensionality reduction (such as feature selection, feature reduction like PCA). BA ...
Output: “100” Day 1338 答案揭晓 DS Interview Question & Answer During analysis, how do you treat missing values? Should we even treat missing values is another important point to consider? If 80% of the values for...
Leetcode -- Day 17 & Day 18 & Day 19 substringQuestion 1Implement strStr()Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Below is my first direct solution, which looks complex in different case checking ...
Day 1363 答案揭晓 DS Interview Question & Answer Is dimensionality reduction the same as feature selection? Why? While feature selection and dimensionality reduction both have the effect of feeding a lower number of features, feature selection techniques (like regularization) are an exercise in finding...
Day 1897 答案揭晓 DS Interview Question & Answer Define: quality assurance, six sigma. Quality assurance: - A way of preventing mistakes or defects in manufacturing products or when delivering services to customers - In a machine learning context: anomaly detection ...
Leetcode -- Day 11 Question 1 Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 We need to consider a lot of cases of input. One particular example is how to deal with many zeros in the end of that number. ...
Day 1908 DS Interview Question If you were a data scientist at a web company that sells shoes, how would you build a system that recommends shoes to a visitor? (Question asked in Verizon Data Scientist Interview) LeetCode Question Write a query in SQL to find the name of patients and the...
cnt =( select max(cnt) from( select question_id,count(answer_id) cnt from survey_log group by question_id ) tmp2 ) 作者:piao-guo-de-xiao-xiong-3 链接:https://leetcode-cn.com/problems/get-highest-answer-rate-question/solution/mei-you-yong-dao-de-chu-fa-de-hui-da-lu-zui-gao-by...
1.Question You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you need to make up that amount. If that amount of money cannot be made up by any combination of the coins, return -1. Example 1:...