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A feature is a property which can be used to describe objects in machine learning. Most of the time those are values in R^n, but not always.

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Use of Activation Units in Facial Expression Understanding

The topic of extracting the Facial Action Coding System (FACS) Action Units (AUs) [1] from images and it's translation into emotion prediction [2] is pretty well studied, but I'm not clear on how it s …
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