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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...eally care about accuracy, your best bet is to test out a couple different ones (making sure to try different parameters within each algorithm as well), and select the best one by cross-validation. But if you’re simply looking for a “good enough” algorithm for your problem, or a place to s...
How should you build your database from source control?
...tabase objects be organized in your SCM repository?
How do you deal with one-time things like conversion scripts or ALTER scripts?
see 2.
How do you deal with retiring objects from the database?
deleted from DB, removed from source control trunk/tip
Who should be responsible for promoting objects ...
MySQL select 10 random rows from 600K rows fast
... specifically, if you have a gap at the start of your IDs the first one will get picked (min/max-min) of the time. For that case a simple tweak is MAX()-MIN() * RAND + MIN(), which is not too slow.
– Code Abominator
Aug 19 '14 at 4:16
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If Python is interpreted, what are .pyc files?
...ke this:
Python is an interpreted language, as
opposed to a compiled one, though the
distinction can be blurry because of
the presence of the bytecode compiler.
This means that source files can be
run directly without explicitly
creating an executable which is then
run.
...
How to convert std::string to NSString?
...acters 'just work.'
If you're making a bigger app, or you're not the only one working on it, however - you'll probably want something that's easier to apply.
Adapted from cocoa-dev mailing list archives
@interface NSString (cppstring_additions)
+(NSString*) stringWithwstring:(const std::wstring&a...
How can I get the corresponding table header (th) from a table cell (td)?
...It would be best to use an id to reference the table if there is more than one.
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Python progression path - From apprentice to guru
...
One good way to further your Python knowledge is to dig into the source code of the libraries, platforms, and frameworks you use already.
For example if you're building a site on Django, many questions that might stump you c...
Breaking up long strings on multiple lines in Ruby without stripping newlines
We recently decided at my job to a ruby style guide. One of the edicts is that no line should be wider than 80 characters. Since this is a Rails project, we often have strings that are a little bit longer - i.e. " User X wanted to send you a message about Thing Y " that doesn't always fit within the...
What is the best way to insert source code examples into a Microsoft Word document?
...2010, using Notepad++ for syntax coloring, and a TextBox which can be captioned:
Choose Insert / Text Box / Simple Text Box
A default text box is inserted
Switch to NPP, choose the language for syntax coloring of your code, go to Plugins / NPPExport / Copy RTF to clipboard
Switch back to wor...
How to vertically center divs? [duplicate]
... (e.g. IE 9 and lower), you'll need to implement a fallback solution using one of the older methods.
Recommended Reading
Browser support
A Guide to Flexbox
Using CSS Flexible Boxes
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