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#1
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The expected validation error of a classification problem should be a number, right? What is the meaning of calculating the expectation of a constant number with respect to the validation set? As far as I can see, it will be definitely be the same constant number.
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#2
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The validation error is a number that depends on the validation data. You can take the expectation of this number with respect to the validation data. That is the expected validation error.
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