---
title: "KL divergence mathematical notation"
description: "KL divergence is a recurring research-paper notation family. Measures the expected log density ratio from a reference distribution p to a comparison…"
canonical_url: "https://fanout.sh/labs/math-decoder/symbol/kl-divergence"
md_url: "https://fanout.sh/labs/math-decoder/symbol/kl-divergence.md"
last_updated: "2026-08-09"
access: "public"
---

# KL divergence mathematical notation

KL divergence is a recurring research-paper notation family. Measures the expected log density ratio from a reference distribution p to a comparison…

## Public overview

KL divergence is a recurring research-paper notation family. Measures the expected log density ratio from a reference distribution p to a comparison distribution q.

KL divergence: Measures the expected log density ratio from a reference distribution p to a comparison distribution q. Example: Under samples from p, average the log probability gap between p and q.

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