<p>I haven't implemented serialization of cubes yet.  Take a look at <code>src/mlpack/core/arma_extend/Mat_extra_bones.hpp</code>, <code>src/mlpack/core/arma_extend/Mat_extra_meat.hpp</code>, and <code>src/mlpack/core/arma_extend/arma_extend.hpp</code> to see how I wrote <code>serialize()</code> for <code>arma::Mat&lt;&gt;</code>.  You can do the same thing with cubes, just the definitions will be <code>ARMA_EXTRA_CUBE_PROTO</code> and <code>ARMA_EXTRA_CUBE_MEAT</code>.  Are you willing to implement that for cube?  It shouldn't be too hard, but if you do, can you also write a few tests in <code>serialization_test.cpp</code>?  (You can look at the tests I wrote for Mat there too.)</p>

<p>If you don't have time, I can get around to it eventually, but as always, my todo list is quite long... :)</p>

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