只有注册用户登录后才能阅读该文。 阅读全文
摘要：
5.3.1 The Validation Set Approachsample() function splits the set of observationsinto two halves, by selecting a random subset of 196 observations out... 阅读全文
摘要：
http://blog.jobbole.com/74951/注意结合recommender system2种方法各自优缺点 阅读全文
摘要：
4.6.1 The Stock Market Data> library (ISLR)> names(Smarket )[1] "Year" "Lag1" "Lag2" "Lag3" "Lag4"[6] "Lag5" "Volume " "Today" " Direction "> dim(Smar... 阅读全文
只有注册用户登录后才能阅读该文。 阅读全文
摘要：
2.3.1 Basic Commandscreate an arrayx = c(1,6,2)create a matrix>x=matrix (data=c(1,2,3,4) , nrow=2, ncol =2)> x=matrix (c(1,2,3,4) ,2,2)> x[1,2][1] 3> ... 阅读全文
摘要：
http://yidianzixun.com/n/09vv1FRK?s=1完全摘抄自网页1 集体智慧和协同过滤1.1 什么是集体智慧（社会计算）？集体智慧 (Collective Intelligence) 并不是Web2.0时代特有的，只是在 Web2.0 时代，大家在Web应用中利用集体智慧构建... 阅读全文
摘要：
refhttp://www.zhizhihu.com/html/y2010/2292.htmlKernel FunctionsBelow is a list of some kernel functions available from the existing literature. As was... 阅读全文
摘要：
key points:1 conversion between different types2 overflow 会有比较多corner cases需要考虑3 iterationrelated questions:Median of Two Sorted ArraysReverse Integer... 阅读全文
摘要：
今天完整刷完leetcode除了自己看不懂follow不下来的 199道题。。。纪念一下Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find ... 阅读全文