<p>This comes from the discussion of <a href="https://github.com/mlpack/mlpack/pull/699" class="issue-link js-issue-link" data-url="https://github.com/mlpack/mlpack/issues/699" data-id="160572780" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#699</a>: we are not sure if using <code>SortStruct</code> instead of <code>pair&lt;double, size_t&gt;</code> provides any speedup. So we should check, and then pick the better of the two approaches.</p>

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