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Random number generator only generating one random number
..., max);
}
}
Edit (see comments): why do we need a lock here?
Basically, Next is going to change the internal state of the Random instance. If we do that at the same time from multiple threads, you could argue "we've just made the outcome even more random", but what we are actually doing is ...
Null vs. False vs. 0 in PHP
...ers can spot/utilize the difference between Null and False and 0 and all the other good "nothing" entities.
What is the difference, specifically in PHP? Does it have something to do with === ?
...
What does “zend_mm_heap corrupted” mean
All of the sudden I've been having problems with my application that I've never had before. I decided to check the Apache's error log, and I found an error message saying "zend_mm_heap corrupted". What does this mean.
...
Differences between C++ string == and compare()?
...rmance-wise in your case to use the equality operator.
Longer answer: The API provides a method to check for string equality and a method to check string ordering. You want string equality, so use the equality operator (so that your expectations and those of the library implementors align.) If perf...
Overcoming “Display forbidden by X-Frame-Options”
...n pages), simply sending another X-Frame-Options header with any string at all disables the SAMEORIGIN or DENY commands.
eg. for PHP, putting
<?php
header('X-Frame-Options: GOFORIT');
?>
at the top of your page will make browsers combine the two, which results in a header of
X-Frame...
How to check task status in Celery?
How does one check whether a task is running in celery (specifically, I'm using celery-django)?
13 Answers
...
RRSet of type CNAME with DNS name foo.com. is not permitted at apex in zone bar.com
...
As per RFC1912 section 2.4:
A CNAME record is not allowed to coexist with any other data. In
other words, if suzy.podunk.xx is an alias for sue.podunk.xx, you
can't also have an MX record for suzy.podunk.edu, or an A record, or
even a TXT record. Especially do not try t...
What do ellipsis […] mean in a list?
... an infinite loop of references, so it decided to cut it short, it's not really infinite. And no, it's not really useful besides a thought experiment :)
– Óscar López
Jun 18 '13 at 3:44
...
Why does pylint object to single character variable names?
...riptive and not too short.
You can use this to avoid such short names:
my_list.extend(x_values)
Or tweak PyLint's configuration to tell PyLint what variable name are good.
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从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...，关于推荐算法的详细介绍，请参考文章：Mahout推荐算法API详解
7. 创建自己的推荐引擎构造器
有了上面的知识，我就清楚地知道了Mahout推荐引擎的原理和使用，我们就可以写一个自己的构造器，通过“策略模式”实现，算法...