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

Is there a rule-of-thumb for how to best divide data into training 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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When to use std::begin and std::end instead of container specific versions [duplicate]

...references or rules that explain when container specific versions of begin and end should be used instead of free functions std::begin and std::end ? ...
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JPG vs. JPEG image formats

I often use JPEG images, and I have noticed that there are two very similar file extensions: .jpg , which my mobile's camera and the Preview application use, and .jpeg , with which Image Capture saves the images from scanning with my Canon MX455 printer. LaTeX doesn't seem to distinguish...
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UIActivityViewController crashing on iOS 8 iPads

... Xcode 6 (Beta 6). UIActivityViewController works fine with iPhone devices and simulators but crashes with iPad simulators and devices (iOS 8) with following logs ...
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Python str vs unicode types

... unicode is meant to handle text. Text is a sequence of code points which may be bigger than a single byte. Text can be encoded in a specific encoding to represent the text as raw bytes(e.g. utf-8, latin-1...). Note that unicode is not encoded! T...
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Entity Framework and Connection Pooling

...ecently started to use the Entity Framework 4.0 in my .NET 4.0 application and am curious about a few things relating to pooling. ...
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What is the difference between null and undefined in JavaScript?

I want to know what the difference is between null and undefined in JavaScript. 33 Answers ...
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CASCADE DELETE just once

... with the ON DELETE CASCADE rule. Is there any way I can perform a delete and tell Postgresql to cascade it just this once? Something equivalent to ...
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How can I make a TextArea 100% width without overflowing when padding is present in CSS?

I have the following CSS and HTML snippet being rendered. 15 Answers 15 ...
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Defining a HTML template to append using JQuery

...of a templating engine in your project, such as: mustache underscore.js handlebars If you don't want to include another library, John Resig offers a jQuery solution, similar to the one below. Browsers and screen readers ignore unrecognized script types: <script id="hidden-template" type="...