o">.</span><span class="n">_frequentPatterns</span><span class="p">):</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    :Description: It is one of the fundamental algorithm to discover frequent patterns in an uncertain transactional database using PUF-Tree.</span>
<span class="sd">    :Reference:</span>
<span class="sd">    Carson Kai-Sang Leung, Lijing Sun: &quot;Equivalence class transformation based mining of frequent itemsets from uncertain data&quot;,</sp