<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69907772">src/mlpack/core/data/load_impl.hpp</a>:</p>
<pre style='color:#555'>> @@ -446,16 +409,16 @@ bool Load(const std::string& filename,
> if (transpose)
> {
> matrix.set_size(cols, rows);
> - info = DatasetInfo(cols);
> + info = DatasetMapper<PolicyType>(info.Policy(), cols);
</pre>
<p>I think it's possible the problem I am thinking of existed in earlier versions of mlpack, but what happens if I do this:</p>
<pre><code>arma::mat trainingSet, testSet;
DatasetInfo d;
data::Load("training_set.csv", trainingSet, d);
data::Load("test_set.csv", testSet, d);
</code></pre>
<p>Ideally the mappings from the first load should be preserved and used for the second load, but the lines here make me think that is not what is happening. I think probably we should add a test for this situation, to ensure that mapping information from a previous load is not destroyed.</p>
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