嵌套交叉驗證（Nested CV）：徹底解決二次資料洩漏與閾值偏移
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⚠️ Clinical Safety & Crisis Operations Protocol Notice
This article is a dedicated systems engineering whitepaper detailing model validation integrity and data leakage prevention algorithms for high-stakes crisis response infrastructure.
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All logs, numerical walkthroughs, and text snippets in this article have been 100% pseudonymized and synthetically generated to strictly prevent clinical PII leakage.