<p>I understand the fix and I think I understand the problem, but I don't know why it is that the cosines are differently calculated in the test and in the <code>CosineTree</code> class.  Both are using <code>arma::norm_dot()</code>.  Have I overlooked something?</p>

<p>I'm very excited about this fix and I think that your patch here is the right way to fix it, I just want to make sure I understand it.</p>

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