6c528fb013
Round 27 findings (Opus parallel concurrency + frontend reviews). Backend P1 fixes: 1. utils/datasets/llm_assist.py: the round 26 helper/advisor active registry used a plain set, so two concurrent helper / advisor loads of the same DEFAULT_HELPER_MODEL_REPO would both set.add() (no-op the second time) and then the first finally set.discard() would underflow the registration while the second call was still mmap'ing the GGUF. Switch to a Counter with proper refcount increment/decrement so the repo stays registered until the last user releases it. 2. routes/inference.py _release_chat_for and core/inference/diffusion.py _release_chat_backend_for_diffusion: helper/advisor GGUF runs on a PRIVATE LlamaCppBackend (round 26 P1 #1), so the global llama checks below could not see them. A user-driven /training/start, /export/load-checkpoint, or /images/load would skip the unload and allocate FLUX VRAM on top of the helper's resident weights, OOMing on 16-24 GB consumer GPUs. Both release paths now consult helper_advisor_busy() and fail 503 (or RuntimeError for the in-backend path) so the user retries instead of double-owning VRAM. Frontend P2 fixes: 3. studio/frontend/src/features/images/images-page.tsx: handleUnload now calls refreshStatus() in the catch path so a partial unload (503 from the backend) does not leave the UI showing a stale "Loaded:" label. Matches the handleLoad pattern. 4. images-page.tsx: when status.is_loading is true, auto-poll refreshStatus every 2 s so the user sees real progress instead of a frozen "Loading..." label until they manually click Refresh. 5. images-page.tsx: aria-label="Inference steps" / "Guidance scale" on the two sliders so screen readers can announce them. 6. images-page.tsx: defensive (r.guidance_scale ?? 0).toFixed(1) in the results caption so a future backend that serialises NaN/None for guidance does not throw at render. Tests: 105 targeted (diffusion + cached_gguf + inference_validation) and 1768 broader backend tests pass locally. Frontend `npm run typecheck` passes. |
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