h4>
<pre class="methodSignature">public abstract&nbsp;<a href="../../runtime/meta/DataCharacteristics.html" title="class in org.apache.sysds.runtime.meta">DataCharacteristics</a>&nbsp;estim&#8203;(<a href="MMNode.html" title="class in org.apache.sysds.hops.estim">MMNode</a>&nbsp;root)</pre>
<div class="block">Estimates the output sparsity of a DAG of matrix multiplications
 for the given operator graph of a single root node.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>root</cod