ainly used to balance the speed and memory requirement.
Larger <code>block_size</code> is faster, but requires more memory.</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    

<p>TODO: The first column is the selected index and the second column is weight.
A two-column matrix. The first column is the weights assigned to each
nearest neighbor. The second column is the corresponding observed outcome
value. The weigh