💡 9 sentences to nail efficient attention / SSM / sparse attention — one page covering the interview essentials (see §1–§11 for derivations). (a) and (b) are mathematically very closely related (§4's ...

"summary": "Cross-model ZH↔EN fidelity check (Codex GPT-5.5 xhigh, from-disk file compare, no web). No fidelity divergences. All 6 high-risk hedges carry the same strength as ZH: §6.2 ungated-additive ...