Comment by gwern

Figure 2 (https://arxiv.org/pdf/2406.05587#page=10) is not at the logit level, it's at the whole completion level (entire names classified by nationality).

So you don't know how any sampling would affect that. There could be only a few options at each token, which give rise to that, and higher temperature sampling may shift that around, but it doesn't ever restore the original base model behavior or restore all of the names erased by mode collapse. (Remember, the LLM is an agent, and when you are sampling, it is on-policy because you are letting it make choices of tokens, and it is steering the completion as a whole back to where it wants to be. With mode collapse, all roads lead to Rome, whether you like it or not.)

People do observe that increasing the temperature does not help, eg. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10936766/ finds basically no difference going from 0 to 0.9 (!): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10936766/bin/po... Just the flattened logits (https://arxiv.org/pdf/2303.08774#page=12&org=openai) at work.