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【单选题】
下面关于机器学习流水线(PipeLine)的描述，错误的是：A.
流水线将多个工作流阶段（转换器和评估器）连接在一起，形成机器学习的工作流，并获得结果输出
B.
要构建一个机器学习流水线，首先需要定义流水线中的各个 PipelineStage
C.
PipelineStage 称为工作流阶段，包括转换器和评估器，比如指标提取和转换模型训练等
D.
流水线构建好以后，就是一个转换器（ Transformer ）
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举一反三
【单选题】In 2012, U.S. core inflation was 2.1 percent. This inflation rate
A.
is lower than the inflation rate the Fed accepts as creating stable prices.
B.
is about equal to the inflation rate the Fed accepts as creating stable prices.
C.
is more than 2 percentage points higher than the inflation rate the Fed accepts as creating stable prices.
D.
None of the above answers are correct because the Fed has never associated an inflation rate with stable prices.
【判断题】The statement, "An increase in inflation tends to cause unemployment to fall in the short run," is normative.
A.
正确
B.
错误
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