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to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
...t should be a separate layer.
The other problem is that when you don't do custom drawing with drawRect, UIKit can optimize stock views so drawRect is a no-op, or it can take shortcuts with compositing. When you override drawRect, UIKit has to take the slow path because it has no idea what you're do...
Managing CSS Explosion
...ps
If you add these semantics to your HTML output, designers can later customize the look of web sites and/or apps using pure CSS, which is a great advantage and time-saver.
If possible, give every page's body a unique class: <body class='contactpage'> this makes it very easy to add pag...
Is Java really slow?
...s of small object allocations). One can code C that beats this (by rolling custom memory management and doing malloc efficiently), but it is not easy.
Method calls are basically free and in some cases faster than large-method code. The HotSpot compiler uses execution information to optimize method c...
Benefits of prototypal inheritance over classical?
...d be obvious here.) This permits you to do things quickly on the fly like customizing classes without huge amounts of infrastructure code.
It is easier to implement a prototyping object scheme than the classic class/object dichotomy schemes.
It eliminates the need for the complex sharp edges around...
Daylight saving time and time zone best practices [closed]
... the line. Don't touch exotic calendars unless you actually have important customers there and then consider separate user-facing server(s) just for that region.
If you can acquire and maintain user's location, use location for systematic date-time conversion (say .NET culture or a SQL table) but p...
Separate Back Stack for each tab in Android using Fragments
...am trying to follow your points, but have been having trouble implementing custom back-stack behaviour. I realise that having been involved in the design of this, you would have a solid insight into how easy it might be. Is it possible that there is a demo app for the OP's use case, as it really is ...
Why would you use an ivar?
... dot syntax with properties definitely masks a lot of work that goes on in custom getters / setters (especially if that getter returns a copy of something every time its called).
– Sam
Jan 31 '12 at 23:45
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Why should I use a pointer rather than the object itself?
...e via a handle, you can often wrap the handle up in a smart pointer with a custom deleter that will deallocate the object appropriately.
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水果vs蔬菜智能分类器 - EdgeML图像识别项目 · App Inventor 2 中文网
... 经典架构
高准确率要求
15-20分钟
Custom CNN
可定制
特殊需求
20-30分钟
训练参数优化配置：
推荐参数配置:
epochs: 80-120 # 训练轮数
batch_size: 16-32 # 批次大小
learning_rate: 0.001 ...
What and where are the stack and heap?
... parts of the heap are allocated or free at any given time; there are many custom heap allocators available to tune heap performance for different usage patterns.
Each thread gets a stack, while there's typically only one heap for the application (although it isn't uncommon to have multiple heaps f...