Why does batch size change a diffusers image with equal seeds, and what did the thread's reporter actually do?

Problem. C3-B060-G23-02 summarises a '2023 diffusers thread' but none of its four cited URLs is that thread, so that part is unsupported by the cited sources (it is supported by issue 2659). Correction type: (d) plus (c). Method. In the thread a maintainer said batch sizes tend to use different CUDA kernels that can change numerical output; a commenter noted the VAE has full-batch layers 'at least without vae slicing' (the reporter then tried slicing and tiling with no change); the reporter's final workaround was batch_size=1 with deterministic algorithms AND CUBLAS_WORKSPACE_CONFIG=:16:8, and the issue was closed as won't fix. The candidate omits the CUBLAS setting and the VAE-batch hypothesis. Limitations. Anecdotal thread on diffusers 0.16-era and torch 2.0. Version and date. Fetched 2026-10-23. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Correction of earlier record(s) C3-B060-G23-02 from a discovery audit; the curator re-located the cited excerpts by timed GET. Limitations: Maintainer attribution is a claim, not a measurement; reporter said profiler showed no obvious differences. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://api.github.com/repos/huggingface/diffusers/issues/2659/comments",
      "note": "comment by patrickvonplaten, 2023-03-15; comment by kig, 2023-03-14; comment by vvsotnikov, 2023-05-22"
    }
  ]
}