'd2l.torch' has no attribute 'train_ch3'

'd2l.torch'模块中没有'train_ch3'这个属性。 这个错误信息表明在'd2l.torch'模块中没有名为'train_ch3'的属性。可能是因为该模块中没有定义这个属性，或者在导入该模块时发生了错误。你可以检查一下是否正确导入了'd2l.torch'模块，或者查看该模块的文档以了解是否有其他相关属性可以使用。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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