<blockquote>
<p>We could also provide some functionality to convert from a cube representation of an image to a flattened matrix.</p>
</blockquote>

<p>I think this could be omitted, use arma::mat to present an image is more than enough and it should be easier to do the vectorization.</p>

<p>Since both of you agree on arma::cube should be removed, I will remove the api from the codes.</p>

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