大约有 14,000 项符合查询结果(耗时:0.0250秒) [XML]

https://stackoverflow.com/ques... 

How to Create Grid/Tile View?

...2.1 syntax */ break-before: always; /* New syntax */ } /* The following is optional */ #flex-container > div { background: #666; color: #fff; margin: 3px; display: flex; justify-content: center; align-items: center; font-size: 36px; } #flex-container > :nth-chil...
https://stackoverflow.com/ques... 

What is the difference between supervised learning and unsupervised learning? [closed]

...hat is close to the input vector in the Euclidean distance is announced as winner in the competition. That neuron is called best matching neuron, i.e. x = arg min ║x - w║. Cooperative phase: the winning neuron determines the center of a topological neighborhood h of cooperating neurons. Thi...
https://stackoverflow.com/ques... 

Does pandas iterrows have performance issues?

...ly at the start of the iteration; this savings alone is one of the biggest wins. Better caching: Iterating over a C array is cache-friendly and thus very fast. A pandas DataFrame is a "column-oriented table", which means that each column is really just an array. So the native actions you can perform...
https://stackoverflow.com/ques... 

Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)

... functions by themselves need to lock the mutex, then recursive mutex is a win-win. For any other case (solving just bad coding, using it even in different objects) is clearly wrong! share | improv...
https://stackoverflow.com/ques... 

How to change the output color of echo in Linux

... to the terminal's default tput bel # Play a bell With compiz wobbly windows, the bel command makes the terminal wobble for a second to draw the user's attention. Scripts tput accepts scripts containing one command per line, which are executed in order before tput exits. Avoid temporary f...
https://stackoverflow.com/ques... 

What exactly are unmanaged resources?

...inside does the "dirty work" (communicates with the operating system using Win32 dlls, calling low level functions or even assembler instructions) which really open the file. And this is, what .NET doesn't know about, unmanaged. But you perhaps can open the file by yourself using assembler instructi...
https://stackoverflow.com/ques... 

Why do pthreads’ condition variable functions require a mutex?

...s synchronization object, but in a way which is not atomic: there exists a window of time when the thread no longer has the lock, and has not yet begun waiting on the object. During this window, another thread can come in, make the awaited condition true, signal the stateless synchronization and the...
https://stackoverflow.com/ques... 

When is it practical to use Depth-First Search (DFS) vs Breadth-First Search (BFS)? [closed]

...ve leads to the best outcome. Only some paths in a game tree lead to your win. Some lead to a win by your opponent, when you reach such an ending, you must back up, or backtrack, to a previous node and try a different path. In this way you explore the tree until you find a path with a successful co...
https://stackoverflow.com/ques... 

Why JavaScript rather than a standard browser virtual machine?

... On Windows, you can register other languages with the Scripting Host and have them available to IE. For example VBScript is supported out of the box (though it has never gained much popularity as it is for most purposes even wor...
https://stackoverflow.com/ques... 

What's the difference between Perl's backticks, system, and exec?

...d IPC::Open3 and IPC::Run, as well as Win32::Process::Create if you are on windows. share | improve this answer | follow | ...