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What is data leakage in a modelling context?

  1. A Information unavailable at prediction time influencing the model during training
  2. B Sensitive data being exposed
  3. C Rows lost during a join
  4. D Memory not being released
Answer

Information unavailable at prediction time influencing the model during training

It produces excellent validation scores and a model that fails in production, and is the most common serious mistake in applied work.

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