SegCraft

SegCraft is a config-first semantic segmentation toolkit for training, evaluating, and running image/video prediction from the same YAML setup.

Install

From a checkout, use the same entry point on every platform. It installs a pinned uv, creates the local environment, starts the web app, waits until it is ready, and then opens it in your browser.

.\run.bat

./run.command  # macOS
./run.sh       # Linux

Run doctor, intentionally rebuild the environment with repair, or use the Docker path with the same launcher:

./run.sh doctor
./run.sh repair
./run.sh docker
./run.sh logs
./run.sh stop

The PowerShell equivalents are .\run.ps1 doctor and .\run.ps1 docker. Docker binds the UI only to 127.0.0.1:8000 and keeps outputs and model caches in named volumes. An NVIDIA host can opt into GPU access with:

docker compose -f compose.yaml -f compose.nvidia.yaml up --build

For package-only use, install just the extras you need:

pip install "segcraft[torch]"                    # prediction/training with TorchVision
pip install "segcraft[torch,smp]"                # segmentation-models-pytorch
pip install "segcraft[torch,transformers]"       # Hugging Face segmentation models
pip install "segcraft[torch,transformers,video]" # video files and YouTube helpers
pip install "segcraft[web]"                      # FastAPI UI with video + default model backends

For development from a checkout:

uv sync --frozen --extra web --extra dev

For NVIDIA GPUs, install the CUDA-enabled PyTorch wheel that matches your system from the PyTorch install page, then run:

segcraft doctor

segcraft doctor reports the Python executable, Torch version, CUDA build, CUDA availability, and visible GPU names. If it reports CUDA available: False, launch SegCraft from the environment where Torch can see CUDA, or keep runtime.device: auto so SegCraft falls back to CPU instead of failing.

CLI

segcraft validate
segcraft predict --preset cityscapes_video --local configs/local.yaml
segcraft train --preset fast_dev --local configs/local.yaml
segcraft evaluate --preset quality --local configs/local.yaml

configs/local.yaml is for machine-specific paths and is ignored by git. Start from configs/local.example.yaml.

Web App

segcraft-web

Open http://127.0.0.1:8000. The UI accepts either a video upload or a YouTube URL, lets you choose a preset or type a custom preset path/name, shows job progress, shows the active Torch/CUDA runtime, and exposes downloads for the generated outputs.

Notebooks

• notebooks/01_quickstart.ipynb: video prediction demo.
• notebooks/02_config_and_api.ipynb: config and API basics.
• notebooks/03_web_app.ipynb: launching the optional FastAPI app.

Presets

SegCraft merges configs in this order:

1. configs/base.yaml
2. optional preset
3. optional local config

Preset names work in the CLI, Python API, and web app:

• fast_dev: tiny CPU training run.
• quality: longer training settings with scheduler and metrics.
• binary_quickstart: binary foreground/background setup.
• pascal_video: TorchVision PASCAL/VOC video prediction.
• cityscapes_video: SegFormer Cityscapes video prediction.
• cpu_video_demo: short Cityscapes CPU demo settings.
• ade20k_video: SegFormer ADE20K video prediction.
• smp_unet_resnet34: SMP Unet training setup.

task.num_classes controls trainable model heads. task.class_names only controls display names; if labels are missing or do not match the model, SegCraft falls back to class_<id> names during prediction.

Python API

from segcraft import load_config, load_config_object, list_available_presets
from segcraft.prediction import run_prediction

print(list_available_presets())

config = load_config("configs/base.yaml", preset_path="cityscapes_video")
typed = load_config_object("configs/base.yaml", preset_path="cityscapes_video")

events = []
summary = run_prediction(config, progress_callback=events.append)

Outputs

Video prediction writes:

• original.mp4
• overlay.mp4
• comparison.mp4
• summary.json

Image-folder prediction writes masks, overlays, an optional overlay video, and the same summary metadata.

Development

pip install -e ".[web,dev]"
pytest
python -m build
twine check dist/*

Publishing uses .github/workflows/release.yml with GitHub trusted publishing. Configure the PyPI/TestPyPI publisher for owner oney-erge, repository SegCraft-Semantic-Segmentation, workflow release.yml, and environment pypi. A v* tag publishes the package, container image, distribution files, and GitHub release. A manual run can publish to TestPyPI without making a release.