擅长:python、mysql、java
<p>在创建编码器时,通过将参数<code>sparse</code>设置为<code>False</code>,还可以避免首先返回稀疏矩阵。</p>
<p><a href="http://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.OneHotEncoder.html" rel="nofollow noreferrer">OneHotEncoder</a>的文档说明:</p>
<blockquote>
<p>sparse : boolean, default=True</p>
<p>Will return sparse matrix if set True else will return an array.</p>
</blockquote>
<p>然后,您可以再次调用DataFrame构造函数将numpy数组转换为DataFrame。</p>