es a turn at .hi-slate[validation]. The other `\(k-1\)` folds .hi-purple[train].
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&lt;img src="13-Learning_files/figure-html/plot-cvk-1-1.svg" style="display: block; margin: auto;" /&gt;

For `\(k=5\)`, fold number `\(1\)` as the .hi-slate[validation set] produces MSE.sub[k=1].
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&lt;img src="13-Learning_files/figure-html/plot-cvk-2-1.svg" style="display: block; margin: auto;" /&gt;

For `\(k=5\)`, fold number `\(2\)` as the .hi-slate[validation set] produces MSE.sub[k=2].
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&lt;img src="13-Learni