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如何选择机器学习算法 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...g algorithm to choose for your classification problem? Of course, if you really care about accuracy, your best bet is to test out a couple different ones (making sure to try different parameters within each algorithm as well), and select the best one by cross-validation. But if you’re simply l...
How can I format a decimal to always show 2 decimal places?
...ntize(TWOPLACES, context=Context(traps=[Inexact]))
Traceback (most recent call last):
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Inexact: None
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Q. Once I have valid two place inputs, how do I maintain that invariant throughout an application?
If you need the answer to that (along with lots of other useful inf...
Javascript Array.sort implementation?
...the JavaScript Array#sort() function use? I understand that it can take all manner of arguments and functions to perform different kinds of sorts, I'm simply interested in which algorithm the vanilla sort uses.
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Is there a way to access the “previous row” value in a SELECT statement?
... the previous value given the current one (EG, you want to order alphabetically) then I don't know of a way to do that in standard SQL, but most SQL implementations will have extensions to do it.
Here is a way for SQL server that works if you can order rows such that each one is distinct:
select...
What's the difference between isset() and array_key_exists()? [duplicate]
How do the following two function calls compare:
8 Answers
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How to set up fixed width for ?
... you can apply this only in the <head> in each <th> tag and all rows will match
– Diego Fernando Murillo Valenci
Apr 20 '15 at 20:48
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XPath - Selecting elements that equal a value
...the string value of an element as the concatenation (in document order) of all of its text-node descendents.
This explains the "strange results".
"Better" results can be obtained using the expressions below:
//*[text() = 'qwerty']
The above selects every element in the document that has at lea...
XPath: How to check if an attribute exists?
...u should use a more specific expression. But with [@attributeName] you get all nodes which have that attribute.
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How to convert an int to string in C?
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To be sure tat ENOUGH is enough we can do it by malloc(sizeof(char)*(int)log10(num))
– Hauleth
Nov 24 '11 at 13:25
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Using CSS :before and :after pseudo-elements with inline CSS?
...om the generating element, whereas pseudo-class styles just don't apply at all. In your case, for example, if you place text-align: justify in an inline style attribute for a td element, it will be inherited by td:after. The caveat is that you can't declare td:after with the inline style attribute; ...