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摘要： ---恢复内容开始---今天学习LDA主题模型，看到Beta分布和Dirichlet分布一脸的茫然，这俩玩意怎么来的，再网上查阅了很多资料，当做读书笔记记下来：先来几个名词： 共轭先验： 在贝叶斯统计理论中，如果某个随机变量Θ的后验概率p(θ|x)和他的先验概率p(θ)属于同一个分布簇的，那么称p(... 阅读全文

摘要： C++中的 size_t 表示数组的下标，一般为：typedef unsigned size_t;在学习中我们一般使用int表示下标，这样在循环中可以判断边界x>=0 或x=0; i--){ ....}但是如果使用size_t则必须加入边界判断，这是由于size_t是无符号数，当它为0时，再... 阅读全文

摘要： Write a bash script to calculate the frequency of each word in a text filewords.txt.For simplicity sake, you may assume:words.txtcontains only lowerca... 阅读全文

摘要： How would you print just the 10th line of a file?For example, assume thatfile.txthas the following content:Line 1Line 2Line 3Line 4Line 5Line 6Line 7L... 阅读全文

摘要： Given a text filefile.txtthat contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers.You may as... 阅读全文

摘要： You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single ... 阅读全文

摘要： Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two nu... 阅读全文