<p>Sure, if you like.  Here is some quick reading on macros, they are not so hard: <a href="https://gcc.gnu.org/onlinedocs/cpp/Macros.html">https://gcc.gnu.org/onlinedocs/cpp/Macros.html</a></p>

<p>You can see the definition of the <code>PROGRAM_*</code> macros in <code>src/mlpack/core/util/cli.hpp</code>.  Let me know if I can explain anything further :)</p>

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