<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'>> @@ -72,6 +73,10 @@ int main(int argc, char** argv)
> // Parse command line options.
> CLI::ParseCommandLine(argc, argv);
>
> + if (CLI::HasParam("output_file"))
> + Log::Warn << "--output_file (-o) is not specified;"
> + << "no results will be saved!" << endl;
</pre>
<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> I updated it :)</p>
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