A data-free pretraining step that places prompts in flatter loss regions improves calibration and performance when used as initialization for test-time prompt tuning of vision-language models.
(A.6) Substituting this into the expression for S(T) , we obtain S(T) =K−1− 2 K X 1≤i<j≤K t⊤ i tj
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Improving Calibration in Test-Time Prompt Tuning for Vision-Language Models via Data-Free Flatness-Aware Prompt Pretraining
A data-free pretraining step that places prompts in flatter loss regions improves calibration and performance when used as initialization for test-time prompt tuning of vision-language models.