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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
...为是排列后的变量之间的Pearson线性相关系数。
范围：{-1.0,1.0}，当一致时为1.0，不一致时为-1.0。
说明：计算非常慢，有大量排序。针对推荐系统中的数据集来讲，用Spearman秩相关系数作为相似度量是不合适的。
CityBlockSimilari...
How to properly create an SVN tag from trunk?
.../svn.example.com/project/trunk \
http://svn.example.com/project/tags/1.0 -m "Release 1.0"
Shorthand:
cd /path/to/project
svn copy ^/trunk ^/tags/1.0 -m "Release 1.0"
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Integer division: How do you produce a double?
... @FabricioPH This works in every situation, and identically to the *1.0 solution.
– Vitruvius
Feb 23 '14 at 7:55
3
...
Rounded corner for textview in android
...l in the drawable folder and add the following content,
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<stroke
android:width="1dp"
android:color="@color/common_border_color" />
<soli...
Swift: #warning equivalent
... is declare FIXME() function in Swift file:
@availability(iOS, deprecated=1.0, message="I'm not deprecated, please ***FIXME**")
func FIXME()
{
}
and when I call it from any other function it does show a warning, e.g.
override func tableView(tableView: UITableView, numberOfRowsInSection section: ...
Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
...3 col4 col5 col6
0 A B 0.20 -0.61 -0.49 1.49
1 A B -1.53 -1.01 -0.39 1.82
2 A B -0.44 0.27 0.72 0.11
3 A B 0.28 -1.32 0.38 0.18
4 C D 0.12 0.59 0.81 0.66
5 C D -0.13 -1.65 -1.64 0.50
6 C D -1.42 -0.11 -0.18 -0.44
7 E F -0.00 1.42 -0.2...
Named Branches vs Multiple Repositories
...arting point:
[a] - [b]
Make a named branch for a release version, say "1.0", when you get to alpha release. Commit bug fixes on it:
[a] - [b] ------------------ [m1]
\ /
(1.0) - [x] - [y]
(1.0) is not a real changeset since named branch does not exist until ...
Configuration System Failed to Initialize
...b, or app.config if windows) in your project starts as:
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="applicationSettings"
type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutr...
How to decide font color in white or black depending on background color?
...he lightest color and L2 is the luminance of the darkest on a scale of 0.0-1.0. The luminance of black is 0.0 and white is 1.0, so substituting those values lets you determine the one with the highest contrast. If the contrast for black is greater than the contrast for white, use black, otherwise us...
“Content is not allowed in prolog” when parsing perfectly valid XML on GAE
...ur XML and XSD (or DTD) are different.
XML file header: <?xml version='1.0' encoding='utf-8'?>
XSD file header: <?xml version='1.0' encoding='utf-16'?>
Another possible scenario that causes this is when anything comes before the XML document type declaration. i.e you might have somethi...