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Remove link to HEIM for diffusion model evaluation

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Assessment

Difficulty
1/5
Estimated time
Under an hour
Newbie friendliness
90/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Quiet
Domain
documentation

Research direction

Open the Diffusers evaluation documentation at docs/diffusers/conceptual/evaluation and locate the HEIM recommendation. Remove the HEIM link and its suggestion from the list, then check the rendered page to confirm the remaining evaluation guidance and links are intact.

Written by the indexing model from the issue text.

Description

The doc page https://huggingface.co/docs/diffusers/conceptual/evaluation currently suggests using HEIM for diffusion model evaluation.
Unfortunately, HEIM is no longer officially supported or actively maintained (see stanford-crfm/helm#2161, stanford-crfm/helm#3741) and is currently not in a state that would function properly off the shelf.

From my experience, it is currently quite the pain to get some version of HEIM to somewhat function (it did involve some major manual rewrites and tons of dependency conflicts), and still I ran into trouble even reproducing the standard leaderboards.

I would hence recommend to remove HEIM from the list of suggested evaluation frameworks.

Dominant language
Python
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