Introduction to Algorithms 2nd ed. Cambridge, MA: MIT Press, 2001. ISBN: 9780262032933. Introduction and document distance L1 Introduction and document distance CLRS, chapters 1-3 L2 More document distance, mergesort CLRS, sections 11.1-11.2 Binary s…
[翻译] 提升树算法的介绍(Introduction to Boosted Trees) 1. 有监督学习的要素 XGBoost 适用于有监督学习问题.在此类问题中,我们使用多特征的训练数据集 \(x_i\) 去预测一个目标变量 \(y_i\) .在专门学习树模型前,我们先回顾一下有监督学习的基本要素. Elements of Supervised Learning XGBoost is used for supervised learning problems, where we use th…
图形上下文导论(Introduction to SWT Graphics) 摘要: org.eclipse.swt.graphics包(package),包含了管理图形资源的类.只要实现了org.eclipse.swt.graphics.Drawable接口,就可在上面绘画,包括 org.eclipse.swt.widgets.Control 和 org.eclipse.swt.graphics.Image . org.eclipse.swt.graphics.GC封装了全部绘画API,包括如何…
课程信息 6.006 Introduction to Algorithms…
搜索树数据结构支持很多动态集合操作,如search(查找).minmum(最小元素).maxmum(最大元素).predecessor(前驱).successor(后继).insert(插入).delete(删除).这些都是基本操作,能够使用一颗搜索树当做一个字典或者一个优先队列. 12.1.什么事二叉搜索树 二叉搜索树是以一棵二叉树来组织的,能够用一个链表数据结构来表示,也叫二叉排序树.二叉查找树. 当中的每一个结点都是一个对象,每一个对象含有多个属性(key:该结点代表的值大小.卫星数据:不…
Lecture 3(part 1) Divide and conquer 1. the general paradim of algrithm as bellow: 1. divide the problem into subproblems; 2. conqure each subproblems recrusively; 3. combine solution 2. Some typical problem (part 1) the matrix mutiplication(strassen…
Problem Description The Czech Technical University years of its existence . Some of the university buildings are old as well. And the navigation in old buildings can sometimes be a little bit tricky, because of strange long corridors that fork and jo…
pid=3572">Task Schedule Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3412    Accepted Submission(s): 1197 Problem Description Our geometry princess XMM has stoped her study in computation…
Task是.NET4.0加入的,跟线程池ThreadPool的功能类似,用Task开启新任务时,会从线程池中调用线程,而Thread每次实例化都会创建一个新的线程. 我们可以说Task是一种基于任务的编程模型.它与thread的主要区别是,它更加方便对线程进程调度和获取线程的执行结果. Task类和Task<TResult>类前者接收的是Action委托类型后者接收的是Func<TResult>委托类型 任务和线程的区别: 1.任务是架构在线程之上的,也就是说任务最终还是要抛给线程…
1.What does the analogy “AI is the new electricity” refer to?  (B) A. Through the “smart grid”, AI is delivering a new wave of electricity. B. Similar to electricity starting about 100 years ago, AI is transforming multiple industries. C. AI is power…