<p><b>@rcurtin</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/mlpack/mlpack/pull/775">src/mlpack/core/util/cli.cpp</a>:</p>
<pre style='color:#555'>&gt; +    // Iterate over all the program_options, looking for duplicate parameters.
+    // If we find any, remove the duplicates.
+    for (unsigned int i = 0; i &lt; bpo.options.size(); i++)
+    {
+      for (unsigned int j = i + 1; j &lt; bpo.options.size(); j++)
+      {
+        if (bpo.options[i].string_key == bpo.options[j].string_key)
+        {
+          // If a duplicate is found, check to see if either one has a value.
+          if (bpo.options[i].value.size() == 0 &amp;&amp;
+              bpo.options[j].value.size() == 0)
+          {
+            // If neither has a value, consider it a duplicate flag and remove
+            // the duplicate. It&#39;s important to not break out of this loop
+            // because there might be another duplicate later on in the vector.
+            bpo.options.erase(bpo.options.begin() +  j);
</pre>
<p>Nice catch, thanks.  Fixed in <a href="https://github.com/mlpack/mlpack/commit/139ad60d5f2f450a3c08c00f3ecea970a48d277e" class="commit-link"><tt>139ad60</tt></a>.</p>

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