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Is there a rule-of-thumb for how to divide a dataset into training and validation sets?

...aining and validation sets? Is an even 50/50 split advisable? Or are there clear advantages of having more training data relative to validation data (or vice versa)? Or is this choice pretty much application dependent? ...
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libpthread.so.0: error adding symbols: DSO missing from command line

When I'm compiling openvswitch-1.5.0, I've encountered the following compile error: 14 Answers ...
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How do I append one string to another in Python?

I want an efficient way to append one string to another in Python, other than the following. 10 Answers ...
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Angularjs loading screen on ajax request

Using Angularjs , I need to show a loading screen (a simple spinner) until ajax request is complete. Please suggest any idea with a code snippet. ...
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Create subdomains on the fly with .htaccess (PHP)

I am looking to create a system which on signup will create a subdomain on my website for the users account area. 9 Answer...
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Iterate through a HashMap [duplicate]

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Can you use a trailing comma in a JSON object?

When manually generating a JSON object or array, it's often easier to leave a trailing comma on the last item in the object or array. For example, code to output from an array of strings might look like (in a C++ like pseudocode): ...
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In C#, what is the difference between public, private, protected, and having no access modifier?

All my college years I have been using public , and would like to know the difference between public , private , and protected ? ...
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Is the sizeof(some pointer) always equal to four?

For example: sizeof(char*) returns 4. As does int* , long long* , everything that I've tried. Are there any exceptions to this? ...
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Copy a file in a sane, safe and efficient way

I search for a good way to copy a file (binary or text). I've written several samples, everyone works. But I want hear the opinion of seasoned programmers. ...