Collection maturity. A 5-document corpus is a best case for the attacker: there are few legitimate corroborating documents for the financial topic, so three poisoned docs can dominate retrieval easily. In a mature knowledge base with dozens of documents touching Q4 financials — analyst summaries, board presentations, quarterly filings — the attack needs proportionally more poisoned documents to achieve the same displacement effect. The access control layer also becomes more useful in mature collections, because tighter document classification limits where injected documents can be placed.
// 优化：如果本轮没交换，说明已经有序
。关于这个话题，Telegram 官网提供了深入分析
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