XOR operation:

Its useful to sync a fork when contributing to open source project.

因为类型是Mutation的，所以reference和copy就有了区别。如果是reference，那么可能会暴露数据本身，遭到恶意修改，引发安全的问题。下面是一段Java代码，其中有一个 Mutation引起的的bug：

1. States defined by values of a fixed set of variables from domain

While propositional logic assumes the world contains facts, first-order logic assumes the world contains objects, relations, functions, like natural language.

Problem: decide whether to wait for a table at a restaurant, based on the following attributes:

a set of sentences. - inference:deriving new sentences from old - TELL: add new sentences to the knowledge base - ASK: a way to query what is known. The…

To our shareowners: This year, Amazon became the fastest company ever to reach $100 billion in annual sales. Also this year, Amazon Web Services is reaching…

The Crawler Service processes each page link by doing the following in a loop:

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Base10, Base62

境界 1：参数可单机存储和更新

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Semaphores: It’s simply a way to limit the number of consumers for a specific resource. For example, to limit the number of simultaneous calls to a database in…

One of k encoding on an array of lenght k

Probability/Statistics Questions

Google papers(GFS/BigTable/Spanner/F1)

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Strictly speaking, there is no such thing as “data science” (see What is data science and what is it not? ). See also: Vardi, Science has only two legs:…

1. What metrics should be used for evaluating a model on an imbalanced data set? (precision + recall or ROC=TPR+FPR)

Machine Learning

Machine Learning

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1. What metrics should be used for evaluating a model on an imbalanced data set? (precision + recall or ROC=TPR+FPR)

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2017-10-15

2017-09-06

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PhD in Computer Science, Computational Linguistics, or related field preferred, or Master’s degree with 2+ years’ of relevant industry experience

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[37,-34,-48,null,-100,-100,48,null,null,null,null,-54,null,-71,-22,null,null,null,8]

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Strictly speaking, there is no such thing as “data science” (see What is data science and what is it not? ). See also: Vardi, Science has only two legs:…

做题的时候遇到了sort，想试试Java 8的新语法。于是有了一些研究：

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same with 51

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terminal case: null - True

java 传值还是引用

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Background introduced by Michael Stonebraker

数据库索引与事务管理

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MySQL高可用方面，目前业界主流依然是基于异步复制的技术，例如Keepalived、MHA、ZooKeeper等，要求数据强一致的场景逐步开始使用分布式协议，这方面的典型代表有PXC、Group Replication、TiDB。下面我们就重点来说说keepalived、MHA和PXC这几种大家用得比较多的架构。

Statistical Learning

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Pure math. Median definition is the median is used for dividing a set into two equal length subsets, that one subset is always greater than the other.

Pure math. Median definition is the median is used for dividing a set into two equal length subsets, that one subset is always greater than the other.

sudo apt-get update

select t2.day, round(ifnull(t1.c, 0) / t2.c, 2) as ‘cancellation rate’

select c2.name

select e.name, b.bonus

select d.dept\name, count(s.student\id) as student\number

select distinct name

175. Combine Two Tables

176. Second Highest Salary

177. Nth Highest Salary

178. Rank Scores

178. Rank Scores

1. <https://en.wikipedia.org/wiki/Hammingcode

如果你不知道什么是for/while lopp、不知道什么是list，建议你先上这门公开课：

Statement of Financial Position, also known as the Balance Sheet, presents the financial position of an entity at a given date. It is comprised of the…

represent word as low dimensional, dense vectors

发现一个很好的xpath入门教程

记录一下自己认为比较有用的片段

http://www.jianshu.com/p/9b362cdee2ab

https://zhuanlan.zhihu.com/p/26099601

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commandline profiling

1. http://www.pcgamer.com/hard-drive-vs-ssd-performance/2/

默认情况下，PostgreSQL 是配制成绑定 “localhost”.

1. Four different views of AI

POST: post data

There is an unacceptable solution for leetcode Minimum Height Trees due to time limit exceeded. But it’s an algorithm I didn’t know, so record it.

is a instance of a running program

1. Interruption

1. know the features

1 HZ = 1 clock time

connect by points and write by order

load code class and other java base classes such as java.io util …

OK。终于仍不住要自己开贴记录一下刷题流程了。那么就从今天开始吧，希望今年能把所有的内容都更新起来。

Physical Data Independence: the ability to modify the physical schema without changing the logical schema

按, 作为一个Python初学者, Python的格式化语法让众多编程小白追捧, 它的语法糖让代码变得简洁易读, 它的庞大开源库让它在各个领域都能发挥作用. 但我时常感受到这个门槛极低的语言远没有表面上看起来易懂易用. 在Python的学习之路上, 我也时常迷茫于自己是否真正掌握了这门语言.…

按，本文根据陈驰在tigger kaggle小组中的关于kaggle比赛的微讲座整理的。整理者：Wente Guo(正文部分), EK(QA部分及审核)

按, 上篇介绍了generator相关的概念. 这篇来探究一下generator相关的操作方法. 以下都是使用Python 2.7.10.

按, 作为一个Python初学者, Python的格式化语法让众多编程小白追捧, 它的语法糖让代码变得简洁易读，它的庞大开源库让它在各个领域都能发挥作用. 但我时常感受到这个门槛极低的语言远没有表面上看起来易懂易用. 在Python的学习之路上, 我也时常迷茫于自己是否真正掌握了这门语言.…

This is one of notes from CS3943/9223 Foundation of Data Science at New York University.

This is one of notes from CS3943/9223 Foundation of Data Science at New York University.

It is easy and simple to build a website with Jekyll. An advantage of using Jekyll is the ability to support MathJax, which means I can write LaTeX-like…