Target-Encoding on The Standard Errorhttps://jongha-jeon-dev.github.io/standarderror/tags/target-encoding/Recent content in Target-Encoding on The Standard ErrorHugo -- 0.123.7en-gbTue, 13 Oct 2026 00:00:00 +0000ML 40: Target Encoding Fitted on the Training Rows Still Leaks, Into Traininghttps://jongha-jeon-dev.github.io/standarderror/lectures/ml-40-target-encoding/Tue, 13 Oct 2026 00:00:00 +0000https://jongha-jeon-dev.github.io/standarderror/lectures/ml-40-target-encoding/Fitting an encoding only on training rows protects the test set. It does not protect the training rows from their own labels, and with many rare levels that is enough to wreck the model.