Switch the builder stage to nvidia/cuda:12.9.0-devel-ubuntu24.04 and create a Python 3.12 venv to avoid PEP 668 “externally managed” errors, install Torch 2.8.0+cu129 in that venv, and build a cp312 SageAttention 2.2 wheel from upstream; copy and install the wheel in the slim runtime so --use-sage-attention works at startup.
This resolves prior build failures on Debian Trixie slim where CUDA toolkits were unavailable and fixes runtime ModuleNotFoundError by ensuring the module is present in the exact interpreter ComfyUI uses.
Switch the builder stage to an NVIDIA CUDA devel image (12.9.0) to provide nvcc and headers, shallow‑clone SageAttention, and build a cp312 wheel against the same Torch (2.8.0+cu129) as the runtime; copy and install the wheel into the slim runtime to ensure the module is present at launch. This replaces the previous approach that only added the launch flag and failed at runtime with ModuleNotFoundError, and avoids apt failures for CUDA packages on Debian Trixie slim while keeping the final image minimal and ABI‑aligned.
Introduce a two-stage Docker build that compiles SageAttention 2.2/2++ from the upstream repository using Debian’s CUDA toolkit (nvcc) and the same Torch stack (cu129) as the runtime, then installs the produced wheel in the final slim image. This ensures the sageattention module is present at launch and makes the existing --use-sage-attention flag functional. The runtime image remains minimal while the builder stage carries heavy toolchains; matching Torch across stages prevents CUDA/ABI mismatch. Also retains the previous launch command so ComfyUI auto-enables SageAttention on startup.
Adds a multi-stage Docker build that compiles SageAttention 2.2/2++ from the upstream repository head into a wheel using nvcc, then installs it into the slim runtime to keep images small. Ensures the builder installs the same Torch CUDA 12.9 stack as the runtime so the compiled extension ABI matches at load time. Shallow clones the SageAttention repo during build to always pull the latest version on each new image build. Updates the container launch to pass --use-sage-attention so ComfyUI enables SageAttention at startup when the package is present. This change keeps the runtime minimal while delivering up-to-date, high-performance attention kernels for modern NVIDIA GPUs in ComfyUI.
This adds av>=14.2 to satisfy Comfy’s API-node canary, ensuring video/audio nodes import without error, and uses the standard PyTorch CUDA 12.9 index URL syntax for reliability. It also installs nvidia-ml-py to align with the ecosystem shift away from deprecated pynvml, reducing future NVML warnings while preserving current functionality. The rest of the base remains unchanged, and existing ComfyUI requirements continue to install as before.
Update the Dockerfile to use python:3.12.11-slim-trixie to align with available cp312 wheels (notably MediaPipe) and avoid 3.13 ABI gaps, add cmake alongside build-essential to support native builds like dlib, keep the CUDA-enabled PyTorch install via the vendor index, and leave user/workdir/entrypoint/port settings unchanged to preserve runtime behavior.
