Source: PAT A1078 Hashing (25 分) Description: The task of this problem is simple: insert a sequence of distinct positive integers into a hash table, and output the positions of the input numbers. The hash function is defined to be (where TSize is the…

局部敏感哈希(Locality Sensitive Hashing,LSH)算法是我在前一段时间找工作时接触到的一种衡量文本相似度的算法.局部敏感哈希是近似最近邻搜索算法中最流行的一种,它有坚实的理论依据并且在高维数据空间中表现优异.它的主要作用就是从海量的数据中挖掘出相似的数据,可以具体应用到文本相似度检测.网页搜索等领域. 1. 基本思想 局部敏感哈希的基本思想类似于一种空间域转换思想,LSH算法基于一个假设,如果两个文本在原有的数据空间是相似的,那么分别经过哈希函数转换以后的它们也具有很高…

原文地址:http://www.codeproject.com/Articles/56138/Consistent-hashing 基于BSD License What is libconhash libconhash is a consistent hashing library which can be compiled both on Windows and Linux platforms, with the following features: High performance and…

一致性 hash 算法( consistent hashing ) 张亮 consistent hashing 算法早在 1997 年就在论文 Consistent hashing and random trees 中被提出,目前在cache 系统中应用越来越广泛: 1 基本场景 比如你有 N 个 cache 服务器(后面简称 cache ),那么如何将一个对象 object 映射到 N 个 cache 上呢,你很可能会采用类似下面的通用方法计算 object 的 hash 值,然后均匀的映射到…

The task of this problem is simple: insert a sequence of distinct positive integers into a hash table, and output the positions of the input numbers. The hash function is defined to be H(key) = key \% TSizeH(key)=key%TSize where TSizeTSize is the max…

11-散列2 Hashing   (25分) The task of this problem is simple: insert a sequence of distinct positive integers into a hash table, and output the positions of the input numbers. The hash function is defined to be H(key)=key%TSize where TSizeis the maximum…

考虑典型的文本分类,一个经典的方法就是     分词,扫描所有特征,建立特征词典 重新扫描所有特征,利用特征词典将特征映射到特征空间编号 得到特征向量 学习参数 w 存储学习参数 w , 存储特征映射词典 预测截断装载学习参数w,装载特征映射词典 扫描数据,将所有特征利用特征映射词典映射到特征空间编号 得到特征向量 利用用学习参数w 对得到的特征向量 进行 点积 做出预测         Feature hashing怎么做? 不使用特征词典了,不用考虑额外的存储词典的空间,直接对特征进行has…

H. Hashing time limit per test 1 second memory limit per test 512 megabytes input standard input output standard output In this problem you are given a byte array a. What you are going to do is to hash its subsequences. Fortunately you don't have to…

DATABASE SYSTEM CONCEPTS, SIXTH EDITION11.1 Basic ConceptsAn index for a file in a database system works in much the same way as the indexin this textbook. If we want to learn about a particular topic (specified by a wordor a phrase) in this textbook,…

Assembling large genomes with single-molecule sequencing and locality-sensitive hashing 好好读读,算法系列的好文章! Assembling large genomes with single-molecule sequencing and locality-sensitive hashing - NATURE BIOTECHNOLOGY marbl/MHAP  - Github MinHash Alignme…