seniorModel Evaluation
What is SNIPS (Self-Normalized IPS)?
Updated May 17, 2026
Short answer
SNIPS reduces variance in IPS by normalizing weights.
Deep explanation
SNIPS modifies IPS by dividing weighted rewards by the sum of importance weights. This stabilizes evaluation by preventing extreme weights from dominating results. While it introduces slight bias, it significantly improves variance stability in real-world systems.
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