1 问题 Whenever you expose a web service / api endpoint, you need to implement a rate limiter to prevent abuse of the service (DOS attacks). Implement a RateLimiter Class with an isAllow method. Every request comes in with a unique clientID, deny a req…

Passive RFID Basics - AN680 INTRODUCTION Radio Frequency Identification (RFID) systems use radio frequency to identify, locate and track people, assets and animals. Passive RFID systems are composed of three components – a reader (interrogator), pass…

Whenever you expose a web service / api endpoint, you need to implement a rate limiter to prevent abuse of the service (DOS attacks). Implement a RateLimiter Class with an isAllow method. Every request comes in with a unique clientID, deny a request…

7 Machine Learning System Design Content 7 Machine Learning System Design 7.1 Prioritizing What to Work On 7.2 Error Analysis 7.3 Error Metrics for Skewed Classed 7.3.1 Precision/Recall 7.3.2 Trading off precision and recall: F1 Score 7.4 Data for ma…

In Week 6, you will be learning about systematically improving your learning algorithm. The videos for this week will teach you how to tell when a learning algorithm is doing poorly, and describe the 'best practices' for how to 'debug' your learning…

Problem F Lighting System Design Input: Standard Input Output: Standard Output You are given the task to design a lighting system for a huge conference hall. After doing a lot of calculation & sketching, you have figured out the requirements for an e…

http://blog.csdn.net/pipisorry/article/details/44119187 机器学习Machine Learning - Andrew NG courses学习笔记 Machine Learning System Design机器学习系统设计 Prioritizing What to Work On优先考虑做什么 the first decision we must make is how do we want to represent x, that is…

Butler W. Lampson. Hints for computer system design. ACM Operating Systems Rev. 15, 5 (Oct. 1983), pp 33-48 原文地址:http://research.microsoft.com/en-us/um/people/blampson/33-Hints/WebPage.html 简单就是美,做好一件事情,保证稳定高效的基本功能,找好立足点,时刻准备丢弃一个不要的原型,好的一定要复用,分而治之.…

Problem UVA11400-Lighting System Design Accept: 654  Submit: 4654Time Limit: 3000 mSec Problem Description You are given the task to design a lighting system for a huge conference hall. After doing a lot of calculation and sketching, you have figured…

Qsys 设计流程 ---Qsys System Design Tutorial 1.Avalon-MM Pipeline Bridge Avalon-MM Pipeline Bridge在slave端口接受命令,然后在master端口发送命令.可以把Pipeline Bridge理解为集线器,可以缩减FPGA的管脚. 2.首先搭建一个数据产生系统 csr是处理器用来控制和设置状态寄存器的接口. 3.搭建数据检查系统 4.搭建分层级系统 5.建立顶层系 6.如果不使用Nios II proces…

Lecture 11—Machine Learning System Design 11.1 垃圾邮件分类 本章中用一个实际例子: 垃圾邮件Spam的分类 来描述机器学习系统设计方法.首先来看两封邮件,左边是一封垃圾邮件Spam,右边是一封非垃圾邮件Non-Spam:垃圾邮件有很多features.如果我们想要建立一个Spam分类器,就要进行有监督学习,将Spam的features提取出来,而希望这些features能够很好的区分Spam.事实上,对于spam分类器,通常选取spam中词频最高的…

http://blog.baozitraining.org/2014/09/how-to-prepare-system-design-questions.html 如何准备面试中的系统设计问题一直都是包子的学员,尤其是fresh new grad比较头疼的一个问题.我们的好朋友在mitbbs上面与大家分享了他准备系统设计方面的一些资料和心得,包子在这里和大家再一次分享一下,也感谢我们的好朋友允许我们在这里转载,希望对正在找工作的同学有所帮助.[转载自mitbbs]我的面试也结束了 因为知道FLA…

(1) Advice for applying machine learning Deciding what to try next 现在我们已学习了线性回归.逻辑回归.神经网络等机器学习算法,接下来我们要做的是高效地利用这些算法去解决实际问题,尽量不要把时间浪费在没有多大意义的尝试上,Advice for applying machine learning & Machinelearning system design 这两课介绍的就是在设计机器学习系统的时候,我们该怎么做? 假设我们实现了一…

Machine Learning System Design下面会讨论机器学习系统的设计.分析在设计复杂机器学习系统时将会遇到的主要问题,给出如何巧妙构造一个复杂的机器学习系统的建议.6.4 Building a Spam Classifier6.4.1 Prioritizing What to Work On首先是在设计机器学习系统时需要着重考虑什么问题.以垃圾邮件分类为例.1.确定用监督学习的方法进行学习和预测.2.确定关于邮件的特征.关于挑选特征,实际工作中,是遍历整个训练集,选出出现次数…

Practical System Design using MEF MVVM RX MOQ Unit Tests in WPF Posted on May 21, 2015 by Arup Banerjee Prelude The project is a simple Temperature Converter WPF Application which will allow user to convert from Celsius to Fahrenheit and vice versa.…

/* * 359. Logger Rate Limiter * 2016-7-14 by Mingyang * 很简单的HashMap,不详谈 */ class Logger { HashMap<String, Integer> map; /** Initialize your data structure here. */ public Logger() { map = new HashMap<String, Integer>(); } /** * Returns true if…

SRC=http://www.cs.rutgers.edu/~pxk/416/notes/13-fs-studies.html Paul Krzyzanowski April 24, 2014 Introduction We've studied various approaches to file system design. Now we'll look at some real file systems to explore the approaches that were taken i…

leetcode 主要是一个针对北美的coder人群找工作的代码练习网站,我在2015年初次接触这个网站的时候,总共只有200多道题目,是一个类似acm 的a题网站.这些年变化越来越大,主要是因为找工作当然是多样化的考核过程,leetcode 也逐渐与时俱进,推出了下面几个类别的联系,今天我们随便挑几个练习一下: 175. Combine Two Tables -SQL Table: Person Column Name Type PersonId int FirstName varchar L…

https://www.interviewbit.com/problems/design-cache/ Features: This is the first part of any system design interview, coming up with the features which the system should support. As an interviewee, you should try to list down all the features you can…

这次的项目我们重点关注RocksDB中的一个环节:Rate Limiter.其实Rate Limiter的思想在很多其他系统中也很常用. 在RocksDB中,后台会实时运行compaction和flush操作,这些都会对磁盘进行大量的写操作.可以通过Rate Limiter来控制最大写入速度的上限.因为在某些场景下,突发的大量写入会导致很大的read latency,从而影响系统性能. Rate Limiter的基本原理是令牌桶算法:系统每秒往桶里丢数量为1/QPS的令牌(满了为止),写请求只有…

作者:HelloGitHub-小鱼干 摘要:GitHub Trending 上周看点,老项目依旧抢眼,系统设计必看 Repo:The System Design Primer 周获 1k+ star,而新开源的项目 Real-Time-Person-Removal 表现也不俗,开源当周 star 过 2k+,至于本周 Trending 的周主题 #机器学习# 项目 star 增涨也是蹭蹭蹭- 以下内容摘录自上周微博的 GitHub Trending,选项标准:新发布 | 实用 | 有趣,根据项目…

Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true if the mes…

Problem: Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true i…

COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION An SMP operating system manages processor and other computer resources so that the user perceives a single operating system controlling system resources. In fact, such a c…

原题链接在这里:https://leetcode.com/problems/logger-rate-limiter/ 题目: Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message a…

［抄题］: Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true if t…

Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true if the mes…

You are given the task to design a lighting system for a huge conference hall. After doing a lot of calculation and sketching, you have figured out the requirements for an energy-efficient design that can properly illuminate the entire hall. According t…

Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. Given a message and a timestamp (in seconds granularity), return true if the mes…

意甲冠军  地方照明系统设计  总共需要n不同类型的灯泡  然后进入 每个灯电压v  相应电压电源的价格k  每一个灯泡的价格c   须要这样的灯泡的数量l   电压低的灯泡能够用电压高的灯泡替换   每种灯泡仅仅须要一个相应的电源   求完毕这个照明系统的最少花费 比較简单的DP  easy知道 当要替换一种灯泡中的一个到令一种电压较高的灯泡时  仅仅有所有替换这样的灯泡为还有一种时才可能使总花费变小   所有替换掉就省下了这样的灯泡的电源花费   先把灯泡依照电压排序   那么每种灯泡都能够…