Attention Illuminates LLM Reasoning: The Preplan-and-Anchor Rhythm EnablesFine-Grained Policy Optimization
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How “Attention” Helps AI Think Like a Human Planner

Ever wonder how a chatbot seems to “plan” its answer before it even starts typing? Scientists discovered that the secret lies in the AI’s “attention” – a built‑in spotlight that decides which words matter most. Imagine a writer who first sketches a headline (the “pre‑plan”) and then picks a key phrase that holds the whole story together (the “anchor”). The AI does the same: it spots a crucial word early on and uses it to guide every later step. By watching where this spotlight shines, researchers can tell which parts of a sentence are the real decision‑makers. They then reward those moments during training, making the AI smarter at solving puzzles and answering questions. This breakthrough means future chatbots could be …

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