&gt;<i>&quot;When code breaks often the &quot;lay&quot; user notices. The result is obvious to a novice.&quot;</i><p>That depends &quot;how&quot; it breaks.  As a novice coder myself, I&#x27;ve had things go wrong that I don&#x27;t notice or can&#x27;t identify, and it looks like my program is running fine.<p>I think that&#x27;s the parent&#x27;s point: it might  be stupid to implement crappy macho learning models into production, but it isn&#x27;t worrisome. It&#x27;s expected.