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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...不同的参数），最后选择在交叉验证中表现最好的。jmp0xf 译自Edwin Chen
How do you know what machine learning 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 t...
A numeric string as array key in PHP
... the value with a string key doesn't work, though. Add this line to your example: echo $data['12'];. It will give the error, "Notice: Undefined offset: 12 in - on line 5".
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May 29 '16 at 9:47
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Dynamically select data frame columns using $ and a character value
...different column names and I want to be able to loop over each of them to extract that column from a data.frame. For example, consider the data set mtcars and some variable names stored in a character vector cols . When I try to select a variable from mtcars using a dynamic subset of cols , ne...
Converting String to Int with Swift
...se a formula to calculate acceleration. However, since the values in the text boxes are string, I am unable to convert them to integers.
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Are Javascript arrays sparse?
That is, if I use the current time as an index into the array:
7 Answers
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What is the best way to test for an empty string in Go?
...r enough. It is more a matter of personal taste and about clarity.
Russ Cox writes in a golang-nuts thread:
The one that makes the code clear.
If I'm about to look at element x I typically write
len(s) > x, even for x == 0, but if I care about
"is it this specific string" I tend to wri...
How to use ADB to send touch events to device using sendevent command?
...simulate miscellaneous input events. To simulate tapping, it's:
input tap x y
You can use the adb shell ( > 2.3.5) to run the command remotely:
adb shell input tap x y
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Clean ways to write multiple 'for' loops
...ns, we usually need to write a for loop for each of its dimensions. For example:
16 Answers
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Why do people still use primitive types in Java?
Since Java 5, we've had boxing/unboxing of primitive types so that int is wrapped to be java.lang.Integer , and so and and so forth.
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Which is preferred: Nullable.HasValue or Nullable != null?
... I liked the semantics. However, recently I was working on someone else's existing codebase where they used Nullable<> != null exclusively instead.
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