<frame title="knn">
        <list>
        <e>kNN algorithm can also be used for AD</e>
<e>if the k closest point is further away, a sample is considered more anomalous</e>
<e>$r=\frac{k}{2N\cdot pdf}$</e>
<e>Powerful method, as it can model the pdf directly</e>
        </list>
        </frame>