---
title: "Policy importance ratio mathematical notation"
description: "Policy importance ratio is a recurring research-paper notation family. Measures how much more or less likely the current policy makes a sampled action…"
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/importance-ratio"
md_url: "https://fanout.sh/labs/math-decoder/symbol/importance-ratio.md"
last_updated: "2026-08-09"
access: "public"
---

# Policy importance ratio mathematical notation

Policy importance ratio is a recurring research-paper notation family. Measures how much more or less likely the current policy makes a sampled action…

## Public overview

Policy importance ratio is a recurring research-paper notation family. Measures how much more or less likely the current policy makes a sampled action than the behavior policy that generated it.

Policy importance ratio: Measures how much more or less likely the current policy makes a sampled action than the behavior policy that generated it. Example: The current policy makes this sampled action twenty percent more likely.

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