<p>In <a href="https://github.com/mlpack/mlpack/pull/680#discussion_r67097094">src/mlpack/methods/hmm/hmm_viterbi_main.cpp</a>:</p>
<pre style='color:#555'>&gt; @@ -72,6 +73,10 @@ int main(int argc, char** argv)
&gt;    // Parse command line options.
&gt;    CLI::ParseCommandLine(argc, argv);
&gt;  
&gt; +  if (CLI::HasParam(&quot;output_file&quot;))
&gt; +    Log::Warn &lt;&lt; &quot;--output_file (-o) is not specified;&quot;
&gt; +      &lt;&lt; &quot;no results will be saved!&quot; &lt;&lt; endl;
</pre>
<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> I updated it :)</p>

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