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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
...。
通过“策略模式”匹配不同的数据源，支持File, JDBC(MySQL, PostgreSQL), NoSQL(Cassandra, HBase, MongoDB)。
注：NoSQL的实现在mahout-integration-0.8.jar中。
数据格式支持2种：
GenericDataModel: 用户ID，物品ID，用户对物品的打分(UserID,ItemID,Pre...
What do I need to do to get Internet Explorer 8 to accept a self signed certificate?
...tificates in the following store”.
Click “Browse”, select “Trusted Root Certification Authorities”, and click “OK”.
Back in the wizard, click “Next”, then “Finish”.
If you get a “Security Warning” message box, click “Yes”.
Dismiss the message box with “OK”.
Select T...
What are .NET Assemblies?
...le property of one application only. It is generally stored in application root folder
Public/Shared assembly:
It is a dll which can be used by multiple applications at a time. A shared assembly is stored in GAC i.e Global Assembly Cache.
Sounds difficult? Naa....
GAC is simply C:\Windows\Assembl...
Is it possible to reference one CSS rule within another?
...ariable") instead of any part of a value of another property.
Example:
:root {
--main-bg-color: yellow;
}
@media (prefers-color-scheme: dark) {
:root {
--main-bg-color: black;
}
}
body {
background-color: var(--main-bg-color);
}
...
Why does typeof NaN return 'number'?
...ctions.
Real operations with complex results:
The square root of a negative number
The logarithm of a negative number
The tangent of an odd multiple of 90 degrees (or π/2 radians)
The inverse sine or cosine of a number which is less than −1 or
greater than +1.
Al...
What is the Oracle equivalent of SQL Server's IsNull() function?
...
+1: COALESCE is ANSI, supported by Postgres, MySQL... The only caveat is that it doesn't necessarily perform as fast as native syntax.
– OMG Ponies
Aug 19 '10 at 17:33
...
getting date format m-d-Y H:i:s.u from milliseconds
....433818
10-29-2015 11:40:09.433818
Note that if you want to input into mysql, the time format needs to be:
format("Y-m-d H:i:s.u")
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Set a DateTime database field to “Now”
...
Oops yes NOW() is Mysql, sorry. But the questions remains.
– Thibault Witzig
Dec 20 '10 at 9:38
...
Using Emacs to recursively find and replace in text files not already open
...
M-x find-name-dired: you will be prompted for a root directory and a filename pattern.
Press t to "toggle mark" for all files found.
Press Q for "Query-Replace in Files...": you will be prompted for query/substitution regexps.
Proceed as with query-replace-regexp: SPACE to...
Java client certificates over HTTPS/SSL
...te server, using a client certificate.
The server is using an selfsigned root certificate, and requires that a password-protected client certificate is presented. I've added the server root certificate and the client certificate to a default java keystore which I found in /System/Library/Framewor...