�们可以随机排列数据集。</p>
<p><em>这仅在数据集大小较小且可以保存在内存中时才有效。</em></p>

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            <div class="highlight"><pre><span class="lineno">39</span><span class="k">class</span> <span class="nc">MapStyleDataset</span><span class="p">(</span><span class="n">Dataset</span><span class="p">):</span></pre></div>
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    <div class='section' id='section-6'>
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            <div 