ass or interface in java.util" class="externalLink">List</a>&lt;<a href="../colgroup/AColGroup.html" title="class in org.apache.sysds.runtime.compress.colgroup">AColGroup</a>&gt;&nbsp;groups,
                                          int&nbsp;nRows,
                                          <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/concurrent/ExecutorService.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink">ExecutorService</a