Recent research indicates that probing only the final layer of transformer-based foundation models is often suboptimal, since intermediate layers can yield better features, according to the article. The work argues that representations are still largely studied along depth alone, treating each layer as a single unit rather than examining modules within layers. The finding matters for researchers who select which representations to probe when evaluating or adapting foundation models.
Which representation should be probed in a transformer-based foundation model? Recent work shows that the standard practice of probing the final layer is often suboptimal, as intermediate layers can provide better features. Yet, representations are still largely studied along depth alone, treating e
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