<p>Hi there,</p>
<p>Just to be completely sure that the matrices are the same size, can you add the following line to <code>logisticTest()</code> and see what the output is?</p>
<pre><code>std::cout << "x: " << x_train.n_rows << "x" << x_train.n_cols << "; y: " << y_train.n_rows << "x" << y_train.n_cols << ".\n";
</code></pre>
<p>If you've compiled mlpack from source, you can set the CMake option <code>-DDEBUG=ON</code> to get debugging symbols; that will probably shed a bit more light on what's going on here. To me it looks like you are using the API correctly, but without the context of the rest of the code / an easy way to reproduce the error, I'm not 100% sure when I say that (I may also have overlooked something simple).</p>
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