 the sparsity of database</span>
<span class="sd">        :return: sparsity of database after reading from database</span>
<span class="sd">        :rtype: float</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">matrixSize</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">getDatabaseSize</span><span class="p">()</span><span class="o">*</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span c