<p>That warning doesn't indicate that failure will occur; that warning only indicates that <code>ARMA_64BIT_WORD</code> is not enabled in the Armadillo configuration, so very large matrices (with more than 2^32 elements) cannot be used.  The warning that should be issued if mlpack was compiled without <code>ARMA_64BIT_WORD</code> and a program is being compiled with <code>ARMA_64BIT_WORD</code> reads this: (from <code>src/mlpack/core/util/arma_config_check.hpp</code>):</p>

<pre><code>mlpack was compiled without ARMA_64BIT_WORD, but you are
compiling with ARMA_64BIT_WORD.  This will almost certainly cause irreparable
disaster.  Either disable ARMA_64BIT_WORD in your application which is using
mlpack, or, recompile mlpack against a version of Armadillo which has
ARMA_64BIT_WORD enabled.
</code></pre>

<p>Did you not see that warning when you compiled?  If you didn't, then maybe I need to do some debugging and figure out why...</p>

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