
<span class="sd">        :param prefixLen: length of prefix</span>
<span class="sd">        :type prefixLen: int</span>
<span class="sd">        :param item: the last item</span>
<span class="sd">        :type item: int</span>
<span class="sd">        :param sumLUtil: sum of utility of itemSet</span>
<span class="sd">        :type sumLUtil: float</span>
<span class="sd">        :param period: represent the period of itemSet</span>
<span class="sd">        :type period: int</span>
<span class="sd">        :