from . import _hdfext ImportError: DLL load failed while importing _hdfext: 找不到指定的模块。

根据引用和引用，您遇到的问题是在导入sklearn.preprocessing模块时报错，具体的错误信息是"from . import _hdfext ImportError: DLL load failed while importing _hdfext: 找不到指定的模块"。根据引用的描述，问题的根源是之前下载的scikit-learn包中的sklearn文件夹被手动删除，导致模块文件丢失。由于缺少_hdfext模块，导致加载失败。<span class="em">1</span><span class="em">2</span>
#### 引用[.reference_title]
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