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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...
“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...
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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How to set layout_weight attribute dynamically from code?
...tParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT,
1.0f
);
YOUR_VIEW.setLayoutParams(param);
The last parameter is the weight.
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...
How to debug a GLSL shader?
...g=0.0;
vec3 tile=texture2D(colMap, coords.st).xyz;
vec4 col=vec4(tile, 1.0);
if(something) bug=1.0;
col.x+=bug;
gl_FragColor=col;
}
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How can I “disable” zoom on a mobile web page?
...
<meta name='viewport'
content='width=device-width, initial-scale=1.0, maximum-scale=1.0,
user-scalable=0' >
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How to get a float result by dividing two integer values using T-SQL?
...
SELECT 1.0*MyInt1/MyInt2
– Troglo
Feb 11 '15 at 15:33
...
Showing the same file in both columns of a Sublime Text window
...1:
w.run_command('set_layout', {
'cols': [0.0, 1.0],
'rows': [0.0, 0.33, 1.0],
'cells': [[0, 0, 1, 1], [0, 1, 1, 2]]
})
w.focus_group(0)
w.run_command('clone_file')
w.run_command('move_to_grou...
Dashed line border around UIView
...ontext =UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
// And draw with a blue fill color
CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);
// Draw them with a 2.0 stroke width so they are a bit more visible.
CGContextSetLineWidth(context, 4.0);
CGContex...
How to compare software version number using js? (only number)
...what if we have version strings that are not made up of just digits (e.g. "1.0a")?
What should happen if one version string has more parts than the other? Most likely "1.0" should be considered less than "1.0.1", but what about "1.0.0"?
Here's the code for an implementation that you can use direct...