모델을 새 데이터에 적용하기 전에 이 모델이 진짜 잘 작동하는지 알아야 합니다. 다시 말해서
우리가 만든 모델의 예측을 신뢰할 수 있는지 알아야 합니다.
불행히도 모델을 만들 때 쓴 데이터는 평가 ...
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