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forward KL

2 articles · Page 1 of 1
Machine Learning Algorithms & Natural Language Processing
Machine Learning Algorithms & Natural Language Processing
Aug 9, 2026 · Artificial Intelligence

Why Online RL (OPD, RLHF) Uses Reverse KL While Offline SFT Distillation Prefers Forward KL

The article explains that forward KL encourages a student model to cover all major teacher modes, whereas reverse KL seeks a single dominant mode, and shows why online reinforcement learning methods like OPD and RLHF adopt reverse KL while offline SFT distillation relies on forward KL.

KL DivergenceOPDRLHF
0 likes · 7 min read
Why Online RL (OPD, RLHF) Uses Reverse KL While Offline SFT Distillation Prefers Forward KL
Machine Learning Algorithms & Natural Language Processing
Machine Learning Algorithms & Natural Language Processing
Apr 12, 2026 · Artificial Intelligence

Deep Dive into Forward vs Reverse KL Divergence: When to Use Which?

The article explains the definitions, properties, and asymmetric nature of KL divergence, compares Forward KL (mean‑seeking) and Reverse KL (mode‑seeking) through bimodal examples, and provides practical guidelines for choosing between them based on sampling and probability‑evaluation capabilities in machine‑learning tasks.

KL DivergenceMachine learningModel Selection
0 likes · 10 min read
Deep Dive into Forward vs Reverse KL Divergence: When to Use Which?