<p>Adding <code>ARMA_64BIT_WORD</code> is not something you want to do unless you recompile mlpack against Armadillo that has <code>ARMA_64BIT_WORD</code> enabled. The reason for this is that what <code>ARMA_64BIT_WORD</code> actually controls is whether the Armadillo internal type <code>uword</code> is 32 bits or 64 bits. If mlpack is compiled with 32-bit <code>uword</code> and your program is compiled with 64-bit <code>uword</code>, disaster ensues (as you can see in your last two posts). Right when you enter a function in libmlpack.so, the Armadillo structures are now completely misaligned and suddenly you have a horrible disaster. So, when I asked, I was trying to make sure that you hadn't done that. :)</p>
<p>Anyway, it sounds like <code>ARMA_64BIT_WORD</code> is not the issue, like I had originally thought. Can you provide a minimal working example of the original error, so I can try to reproduce and figure out what is going on?</p>
<p>Thanks!</p>
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