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海量数据相似度计算之simhash短文本查找 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...imhash，计算量还是蛮大，普通PC 比较1000w次海明距离需要 300ms ，和5000w数据比较需要1.8 s。看起来相似度计算不是很慢，还在秒级别。给大家算一笔账就知道了：
随着业务增长需要一个小时处理100w次，一个小时为3600 *1000 = 360w毫...
How do I create a SHA1 hash in ruby?
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386
require 'digest/sha1'
Digest::SHA1.hexdigest 'foo'
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Remove file from SVN repository without deleting local copy
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phihagphihag
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Convert varchar to uniqueidentifier in SQL Server
...RING(@uuid, 1, 8) + '-' + SUBSTRING(@uuid, 9, 4) + '-' + SUBSTRING(@uuid, 13, 4) + '-' +
SUBSTRING(@uuid, 17, 4) + '-' + SUBSTRING(@uuid, 21, 12)
AS UNIQUEIDENTIFIER)
share
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improv...
Can media queries resize based on a div element instead of the screen?
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235
+100
No, med...
Why doesn't Python have a sign function?
... it.
>>> math.copysign(1, -4)
-1.0
>>> math.copysign(1, 3)
1.0
If you get sick of passing two whole arguments, you can implement sign this way, and it will still be compatible with the IEEE stuff mentioned by others:
>>> sign = functools.partial(math.copysign, 1) # eit...
Create JSON object dynamically via JavaScript (Without concate strings)
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edited May 12 '13 at 12:28
answered May 12 '13 at 12:15
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Yellow fade effect with JQuery
I would like to implement something similar to 37Signals's Yellow Fade effect.
15 Answers
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Number of rows affected by an UPDATE in PL/SQL
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edited May 11 '19 at 15:31
Toolkit
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answered Ma...
Check if a variable is of function type
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393
Sure underscore's way is more efficient, but the best way to check, when efficiency isn't an i...