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【单选题】
下面关于评估器（Estimator）的描述错误的是：A.
评估器是学习算法或在训练数据上的训练方法的概念抽象
B.
在机器学习流水线里，评估器通常是被用来操作 DataFrame 数据并生成一个转换器
C.
评估器实现了方法 transfrom() ，它接受一个 DataFrame 并产生一个转换器
D.
评估器实现了方法 fit() ，它接受一个 DataFrame 并产生一个转换器
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【简答题】阅读理解。 How to Be a Winner Sir Steven Redgrave Winner of 5 Olympic Gold Medals 'In 1997 I was found to have developed diabetes (糖尿病). Believing my career was over, I felt extremely low. Then one of the ...
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