When NumPy broadcasting gives you the wrong loss
A shape-compatible operation can still compare the wrong values. Diagnose a silent pairwise-error bug before it reaches your metrics.
2026-10-21
FIELD NOTES
ML Foundations
The ideas underneath the implementation.
Split first, fit second: a preprocessing leakage check
Use a small scaler diagnostic to see whether held-out data is influencing training, then put the boundary inside a scikit-learn pipeline.
2026-10-21