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crazylion lee

Realtime Multi-Person 2D Pose Estimation using Part Affinity Fields - 0 views

www.gitxiv.com/...estimation-using-part-affinity

pose 2d programming computer Science

shared by crazylion lee on 30 Jan 17 - No Cached
  • crazylion lee on 30 Jan 17
     
    "We present a realtime approach for multi-person 2D pose estimation that predicts vector fields, which we refer to as Part Affinity Fields (PAFs), that directly expose the association between anatomical parts in an image. The architecture is designed to jointly learn part locations and their association, via two branches of the same sequential prediction process."
crazylion lee

Jupyter Notebook Viewer - 0 views

nbviewer.jupyter.org/...Advent%20of%20Code.ipynb

computer programming Science python

shared by crazylion lee on 30 Jan 17 - No Cached
  • crazylion lee on 30 Jan 17
     
    "Advent of Code Solutions"
crazylion lee

An integer formula for Fibonacci numbers - Paul's blog - Programming, Computer Science,... - 0 views

paulhankin.github.io/Fibonacci

Fibonacci math

shared by crazylion lee on 10 Jul 16 - No Cached
  • crazylion lee on 10 Jul 16
     
    "Fibonacci"
crazylion lee

Fluent interface - Wikipedia, the free encyclopedia - 1 views

en.wikipedia.org/...Fluent_interface

code interface programming

shared by crazylion lee on 10 Jul 16 - No Cached
  • crazylion lee on 10 Jul 16
     
    "In software engineering, a fluent interface (as first coined by Eric Evans and Martin Fowler) is an implementation of an object oriented API that aims to provide more readable code. A fluent interface is normally implemented by using method cascading (concretely method chaining) to relay the instruction context of a subsequent call (but a fluent interface entails more than just method chaining [1]). Generally, the context is defined through the return value of a called method self-referential, where the new context is equivalent to the last context terminated through the return of a void context."
crazylion lee

PyCharm - 1 views

www.jetbrains.com/pycharm

python ide programming editor development

shared by crazylion lee on 01 Apr 16 - No Cached
  • crazylion lee on 01 Apr 16
     
    "Python IDE for Professional Developers"
張 旭

从达标到卓越 -- API 设计之道 | Taobao FED | 淘宝前端团队 - 0 views

taobaofed.org/...index.html

api system development programming taobao

shared by 張 旭 on 21 Feb 17 - No Cached
  • 高级语言和自然语言（英语）其实相差无几，因此正确地使用（英语的）词法和语法是程序员最基本的素养。
  • 只要能够足够接近人类的日常语言和思维，并且不需要引发额外的大脑思考，那就是易用
  • 词法和语法
  • ...53 more annotations...
  • 语义
  • 版本控制
  • 正确地拼写一个单词是底线
  • 认真地注意 IDE 的 typo 提示（单词拼写错误提示）
  • state 是整个 Component 状态机中的某一个特定状态，既然描述为了状态机，那么状态和状态之间是互相切换的关系。所以对于初始状态，用 initial 来修饰。
  • props 是指 Element 的属性，要么是不存在某个属性值后来为它赋值，要么是存在属性的默认值后来将其覆盖。所以这种行为，default 是合理的修饰词。
  • 成对出现的词应该是：show & hide、open & close。
  • 成对出现的正反义词不可混用
  • 在复数的风格上保持一致，要么所有都是 -s，要么所有都是 -list。
  • 涉及到诸如字典（Dictionary）、表（Map）的时候，不要使用复数！
  • 「map」本身已经包含了这层意思，不需要再用复数去修饰它
  • 最好遵从惯例，使用名词组合 success 和 failure
  • 方法命名用动词
  • 属性命名用名词
  • 布尔值类型用形容词
  • 首字母缩写词的所有字母均大写。（如果某个语言环境有明确的业界惯例，则遵循惯例。）
  • 如果什么都没定，也没业界惯例，那么把单词写全了总是不会错的。
  • React 采用了 componentDidMount 这种过去时风格，而没有使用 componentMounted，从而跟 componentWillMount 形成对照组，方便记忆。
  • 尽量避免使用被动语态。因为被动语态看起来会比较绕，不够直观，因此我们要将被动语态的 API 转换为主动语态。
  • 无论是友好的参数设置，还是让人甜蜜蜜的语法糖，都体现了程序员的人文关怀。
  • 在文件（file）层面同样如此，一个文件只编写一个类，保证文件的职责单一（当然这对很多语言来说是天然的规则）。
  • 将混杂在一个大坨函数中的两件独立事情拆分出去，保证函数（function）级别的职责单一。
  • 现实中的 OOP 编程场景难免触及副作用。
  • 函数本身的运行稳定可预期
  • 函数的运行不对外部环境造成意料外的污染
  • SPM 是阿里通用的埋点统计方案
  • 对外部造成污染一般是两种途径：一是在函数体内部直接修改外部作用域的变量，甚至全局变量；二是通过修改实参间接影响到外部环境，如果实参是引用类型的数据结构。
  • 控制读写权限
  • 优化参数顺序。相关性越高的参数越要前置
  • 可省略的参数后置，以及 为可省略的参数设定缺省值
  • 将可省参数后置同样是最佳实践。
  • 重载（overload）
  • 如果入口参数无法进行有效区分，不要选择重载
  • 根本不明白某个 Boolean 标记位是用来干嘛的，这大大降低了用户的开发体验，以及代码可读性。
    • 張 旭
      張 旭 on 21 Feb 17
       
      我在 ADATA 的 message saver 犯了一樣的錯誤。
  • 同时支持单个和批量的处理，可以降低用户的认知负担。
  • 让 setter 型 API 始终返回 this。这是 jQuery 为我们带来的经典启示 —— 通过返回 this，来产生一种「链式调用（chaining）」的风格
  • 对异步操作都返回一个 Promise
  • 对于一些创造出来的、业务特色的词汇，如果不能用英语简明地翻译，就直接用拼音
  • 一致性可以最大程度降低信息熵
  • 打 log 要么都用中文，要么都用英文。
  • 所有的 setter 操作必须返回 this
  • 「大版本号」即「语义化版本命名」<major>.<minor>.<patch> 中的第一位 <major> 位
  • 接口的扩展方式有很多，比如：继承（extend）、组合（mixin）、装饰（decorate）
  • 在逻辑上确实存在派生关系，并且需要沿用基类行为同时自定义行为的，采用重量级的继承
  • 仅仅是扩充一些行为功能，但是逻辑上压根不存在父子关系的，使用组合
  • 装饰手法更多应用于给定一个接口，将其包装成多种适用于不同场景新接口的情况
  • $.fn.customMethod = function() {};
  • 合理的做法是新增一个 subType 字段
  • 抽象级别一般来说越高越好，将 API 设计成业务无关的，更通用，而且方便扩展
  • 利用多态性（Polymorphism）构建 Consistent APIs。
  • 作为 API 的开发者，一定要提供足够场景适用的 API，来引导我们的用户，不要让他们做出一些出人意料的「妙用」之举
  • 写代码，就像写作，而设计 API 好比列提纲。
  • Think about future, design with flexibility, but only implement for production.
張 旭

Best Practices · mperham/sidekiq Wiki - 0 views

github.com/...Best-Practices

rails ruby background job sidekiq programming

shared by 張 旭 on 08 Feb 17 - No Cached
  • Don't save state to Sidekiq, save simple identifiers.
  • Look up the objects once you actually need them in your perform method.
  • The Sidekiq client API uses JSON.dump to send the data to Redis
  • ...6 more annotations...
  • The Sidekiq server pulls that JSON data from Redis and uses JSON.load to convert the data back into Ruby types to pass to your perform method
  • Idempotency means that your job can safely execute multiple times
  • use a database transaction to ensure data changes are rolled back if there is an error
  • Sidekiq will execute your job at least once.
  • Sidekiq is designed for parallel execution so design your jobs so you can run lots of them in parallel
  • Sidekiq will not provide features which hack around a lack of concurrency in your jobs.
張 旭

Transactions - RSpec Rails - RSpec - Relish - 0 views

relishapp.com/...transactions

rspec test rails programming

shared by 張 旭 on 03 Apr 17 - No Cached
  • before(:all) hooks are invoked before the transaction is opened. You can use this to speed things up by creating data once before any example in a group is run
張 旭

Understanding Ruby Blocks, Procs and Lambdas - Robert Sosinski - 0 views

www.robertsosinski.com/...-ruby-blocks-procs-and-lambdas

ruby block closure programming

shared by 張 旭 on 03 Feb 14 - No Cached
  • Ruby has four different ways of using closures
  • The code block interacts with a variable
  • collect! will use the code provided within the block on each element in the array
  • ...10 more annotations...
  • do not need to specify the name of blocks within your methods
  • use the yield keyword. Calling this keyword will execute the code within the block provided to the method
  • A block is just a Proc!
  • saving reusable code as an object itself. This reusable code is called a Proc (short for procedure)
  • The only difference between blocks and Procs is that a block is a Proc that cannot be saved, and as such, is a one time use solution
  • a bang at the end
  • That value is now available to the block and returned by the yield call
  • The block has the number available (also called n)
  • a flexible way to interact with our method
  • an ampersand argument
張 旭

AngularJS for jQuery Developers | Art & Logic Blog - 0 views

blog.artlogic.com/...ngularjs-for-jquery-developers

jquery angularjs javascript development programming

shared by 張 旭 on 06 Oct 13 - No Cached
  • Angular does not treat HTML or JavaScript as a bug that needs to be fixed
  • JavaScript code treats DOM in an imperative manner: take this node and that attribute, look at its value, do this or that.
  • Direct manipulation of the DOM is not only unnecessary, it is discouraged in the Angular approach.
  • ...11 more annotations...
  • DOM should be specified in views
  • data in scopes
  • functionality in controller
  • non-trivial transformations in custom filters and directives.
  • Binding a DOM value to a model in a controller scope
  • Any controller that needs to use this JSON data, can do so by including DataSource as one of the controller parameters
  • Include $http in the parameters.
  • Include $log as your controller function argument.
  • What happens internally is this: Angular analyzes your function’s source code, finds the arguments, and infers from them the services your code requires.
    • 張 旭
      張 旭 on 06 Oct 13
       
      這段好像就是在講丟參數進去時，AngularJS 會判斷。 不管順序，但是名稱好像需要固定，而且要有 $ 號。
  • Angular predefines reasonable defaults for getting, setting, deleting, and querying records.
張 旭

javascript - How do I "think in AngularJS" if I have a jQuery background? - Stack Overflow - 0 views

stackoverflow.com/...-if-i-have-a-jquery-background

jquery javascript angular programming architecture development google angularjs web

shared by 張 旭 on 02 Oct 13 - No Cached
  • in AngularJS, we have a separate model layer that we can manage in any way we want, completely independently from the view.
  • keep your concerns separate
  • do DOM manipulation and augment your view with directives
  • ...34 more annotations...
  • DI means that you can declare components very freely and then from any other component, just ask for an instance of it and it will be granted
  • do test-driven development iteratively in AngularJS!
  • only do DOM manipulation in a directive
  • with ngClass we can dynamically update the class;
  • ngBind allows two-way data binding;
  • ngShow and ngHide programmatically show or hide an element;
  • The less DOM manipulation, the easier directives are to test, the easier they are to style, the easier they are to change in the future, and the more re-usable and distributable they are.
  • still wrong.
  • Before doing DOM manipulation anywhere in your application, ask yourself if you really need to.
  • a few things wrong with this
  • jQuery was never necessary
  • use angular.element and our component will still work when dropped into a project that doesn't have jQuery.
  • just use angular.element
  • the element that is passed to the link function would already be a jQuery element!
  • directives aren't just collections of jQuery-like functions
  • Directives are actually extensions of HTML
  • If HTML doesn't do something you need it to do, you write a directive to do it for you, and then use it just as if it was part of HTML.
  • think how the team would accomplish it to fit right in with ngClick, ngClass, et al.
  • Don't even use jQuery. Don't even include it.
  • ry to think about how to do it within the confines the AngularJS.
  • In jQuery, selectors are used to find DOM elements and then bind/register event handlers to them.
  • Views are (declarative) HTML that contain AngularJS directives
  • Directives set up the event handlers behind the scenes for us and give us dynamic databinding.
  • Views are tied to models (via scopes). Views are a projection of the model
  • In AngularJS, think about models, rather than jQuery-selected DOM elements that hold your data.
  • AngularJS uses controllers and directives (each of which can have their own controller, and/or compile and linking functions) to remove behavior from the view/structure (HTML). Angular also has services and filters to help separate/organize your application.
  • Think about your models
  • Think about how you want to present your models -- your views.
  • using the necessary directives to get dynamic databinding.
  • Attach a controller to each view (using ng-view and routing, or ng-controller)
  • Make controllers as thin as possible.
  • You can do a lot with jQuery without knowing about how JavaScript prototypal inheritance works.
  • jQuery is a library
  • AngularJS is a beautiful client-side framework
張 旭

Break Deep Associations - 0 views

ingramchen.io/...break-deep-associations.html

database development test programming table architecture

shared by 張 旭 on 08 May 15 - No Cached
  • 常寫單元測試的開發者，多半已經養成遇到難測的元件時，就替該元件抽一個 interface 隔離
  • 部署的時候再藉由 Dependency Injection 注入真正的實作
  • 將它們隔離。這跟 class 抽 interface 其實很像的，都讓耦合下降，提高模組化
  • ...1 more annotation...
  • 如果測試很難寫，那八成設計有問題
crazylion lee

danielstjules/jsinspect · GitHub - 0 views

github.com/...jsinspect

javascript programming

shared by crazylion lee on 26 Apr 15 - No Cached
  • crazylion lee on 26 Apr 15
     
    "Detect copy-pasted and structurally similar code"
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