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Hong-Fu Tan

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#artificial intelligence Preprint Sep 2026

Activation Flow: Manufacturing Activations for Steering

Difference-in-means steering requires activations recorded while a model shows the desired behavior, which a sandbagging model withholds by deliberately underperforming. We introduce Activation Flow (ActFlow), which manufactures these activations from $k$ correct labels without fine-tuning. ActFlow sets target logits t...

Hong-Fu Tan, Linh Le, David Williams-King · 0 citations
Jul 2026

PUDA: An AI-Native Hardware Harness for Self-Driving Laboratories

PUDA separates scientific orchestration from physical operation and data telemetry: agents choose experiments, while PUDA executes validated commands and captures provenance-linked state, responses, and data.

Ze-Kun Ren, Hong-Fu Tan, Jiaen Yee et al. · 0 citations
#machine learning Preprint Aug 2026

A Causal Model for Locating and Unlocking Sandbagging in Model Organisms

A causal model of how sandbagging is carried in the residual stream is proposed, which predicts a window of layers, after the last sandbagging write and before the answer commit, in which a single-layer reference graft of the sandbagging axis to its honest value restores the full capability.

Hong-Fu Tan, Linh Le, David Williams-King · 0 citations
#artificial intelligence Preprint Aug 2026

Reference-Grafting Matches Fine-Tuning at Eliciting Sandbagged Capabilities

Sandbagging, in which a model deliberately underperforms on an evaluation despite retaining the underlying capability, threatens the safety evaluations that frontier-model governance depends on. The Elicitation Game found that fine-tuning elicits hidden capability from sandbagging model organisms whereas additive activ...

Linh Le, Hong-Fu Tan, David Williams-King · 1 citation

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