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Phantom Transfer: Learning Traits Through Subtle Semantic Cues

The paper explores 'phantom transfer,' a phenomenon where supervised fine-tuning transmits traits between models through seemingly innocuous data. The process involves generating data with a specific trait, filtering out explicit traces, and fine-tuning a new model, which then exhibits the trait. The study provides evidence that semantic cues, not explicit signals, drive this transfer and highlights challenges in defending against it.

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PublishedSeptember 16, 2026Helena Casademunt
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WHY IT MAY MATTER

This research highlights the risk of hidden trait transmission in machine learning models through seemingly safe data, emphasizing the need for better detection and defense mechanisms.

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