s="shortcomment cmt">It manages the dataset when performing SLC.</p><div class="fullcomment"><div class="comment cmt"><p>It manages the dataset when performing SLC. The actions are:
*) free the memory used by the working data in the machines
*) collect the entire dataset in each machine to perform SLC
*) keep the dataset update on the machines when the number of trees change in the model selection</p></div><dl class="paramcmts block"><dt class="tparam">U</dt><dd class="cmt"><p>working data type</p></dd></dl