Why ad-hoc pandas preprocessing silently causes data leakage (and how to fix it to get higher real-world ML accuracy)
This story is from 2026-09-14. It is preserved in the archive; the latest stories are on the live feed.
One of the most common mistakes beginners (and even intermediate practitioners) make when working with tabular data is **Data Leakage**. It’s often the hidden reason why your model gets **88% accuracy in your Jupyter notebook**, but drops to **76%** when you evaluate it on an unseen test set or sub…
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- 2026-09-14 15:48 · r/learnmachinelearning
Why ad-hoc pandas preprocessing silently causes data leakage (and how to fix it to get higher real-world ML accuracy)