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Very large matrices using Python and NumPy
...L-like GROUP BY aggregation at 1,000,000 rows/second. Not bad for a Python-based solution!
Accessing the data as a NumPy recarray again is as simple as:
data = table[row_from:row_to]
The HDF library takes care of reading in the relevant chunks of data and converting to NumPy.
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普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...索新的技术，新的方法；把“非舒适区”转换成舒适区会拓展我们的知识面。这种不断探索的精神最后可能发展到——不仅仅停留在探索“IT技术”上，开始各种折腾，比如折腾电子制作、折腾写小说、折腾研究曲艺、折腾评书...
Encrypting & Decrypting a String in C# [duplicate]
...votes, I've updated it to fix silly bugs and to generally improve the code based upon comments and feedback. See the end of the post for a list of specific improvements.
As other people have said, Cryptography is not simple so it's best to avoid "rolling your own" encryption algorithm.
You can, h...
Get data from file input in JQuery
I actually have a file input and I would like to retrieve the Base64 data of the file.
7 Answers
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京东618：算法让UV价值提升200%+，用智能卖场缩短购物路径 - 更多技术 - 清...
...上的智能技术就是深度学习，或者是取代传统模型，或者拓展传统方法解决不了的问题，但整个互联网推荐的深度学习探索都还比较初级，京东目前有什么经验可以分享？
智能卖场团队：在京东目前基于Deep Learning的模型已经在...
Different floating point result with optimization enabled - compiler bug?
...finite precision, or if you were working with a device that used a decimal-based rather than binary-based floating point representation. But, you aren't. Most computers use the binary IEEE floating point standard.
As Maxim Yegorushkin already noted in his answer, part of the problem is that intern...
Missing include “bits/c++config.h” when cross compiling 64 bit program on 32 bit in Ubuntu
...it version of Ubuntu 10.10 and trying to cross compile to a 64 bit target. Based on my research, I have installed the g++-multilib package.
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App Inventor 2 软件著作权（软著）申请指南 · App Inventor 2 中文网
... 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 搜索 ...
Swift Beta performance: sorting arrays
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static const uint64_t NANOS_PER_SEC = 1000ULL * NANOS_PER_MSEC;
mach_timebase_info_data_t timebase_info;
uint64_t abs_to_nanos(uint64_t abs) {
if ( timebase_info.denom == 0 ) {
(void)mach_timebase_info(&timebase_info);
}
return abs * timebase_info.numer / timebase_info.de...
Simplest two-way encryption using PHP
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Since PHP 7 the mcrypt function is remove from php codebase. So when using the latest version of php (which should be standard) you are not able to use this deprecated function anymore.
– Alexander Behling
Sep 12 '19 at 13:09
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