<p>It is under optimizing, you can study more in <a href="https://github.com/mlpack/mlpack/pull/681" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/681" data-id="158662064" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#681</a>. This implementation need to do data mapping when parsing. I haven't deal with the case it do not need to do data mapping yet.</p>

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