}} 
    }
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<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
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<div id="hiddden">The neural network whose learning performance is measured in
Figure <a class="insideBookFigRef" target="_blank" href="https://aimacode.github.io/aima-exercises/figures/restaurant-back-prop-figure.png">restaurant-back-prop-figure</a> has four hidden
nodes. This number was chosen somewhat arbitrarily. Use a
cross-validation 