Unverified50% confidenceCautionExact time
A common mistake is using predictor variables during training that cannot be obtained at prediction time—for example, features that take several days to collect in full cannot be used for real-time prediction.
1
Sources
50%
Confidence
Long-term
Relevance
8/13/2026
First Seen
Sources
泛化才是机器学习的核心：训练前决定成败的关键因素
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