dlup - Deep Learning Utilities for Pathology
dlup provides tools to work with large whole-slide images (WSIs) for
computational pathology: tiled reading across multiple backends, tiling
datasets, geometry/annotation handling, and pyramidal TIFF writing. Performance
critical pieces are implemented in C++20 and exposed to Python via
nanobind.
This repository is automatically synced from the AI for Oncology monorepo. It builds both with Bazel (via bzlmod) and with Meson (used to produce the Python wheels).
Features
- Multiple slide backends: FastSlide, OpenSlide, tifffile, DeepZoom and remote/SlideScore
- Tiling datasets: grid-based tile extraction with masks, annotations and metadata
- Geometry: fast C++ polygons/points/boxes, marching squares, and Shapely interop
- Annotations: import/export GeoJSON, HALO, SlideScore and dlup XML
- Writers: pyramidal (libtiff-backed) and tifffile TIFF writers
- Background estimation: native foreground/background masking
Installation (Python)
pip install dlup
# To enable the OpenSlide backend (bundled prebuilt libopenslide):
pip install "dlup[openslide]"
import dlup
from dlup import SlideImage
slide = SlideImage.from_file_path("slide.svs")
region = slide.read_region((0, 0), 0, (512, 512))
Building from source
Bazel
# Build the C++ libraries and Python package (native extensions)
bazelisk build //:dlup
# Run the Python test suite
bazelisk test //tests/python:tests
Meson (wheels)
# Build a wheel + sdist for the current interpreter
uv build
The Meson build fetches every native dependency through subprojects/*.wrap
(aifocore, Boost.Geometry, libtiff, nanobind, ...) and links them statically,
producing self-contained extensions. The pure-Python runtime dependencies
(FastSlide, fim, NumPy, Shapely, ...) are installed by pip from PyPI.
Development install
For day-to-day development you can work either through the Python (uv/Meson) toolchain or through Bazel.
uv (editable, Meson backend)
dlup is a compiled (nanobind) package, so the editable install uses
meson-python's rebuild-on-import hook. That hook re-invokes meson/ninja at
import time, which means it must NOT be installed with build isolation — with
isolation the build tools live in a throwaway environment that is deleted right
after install, and the first import dlup fails with
FileNotFoundError: .../bin/ninja.
Install the build tools into your environment first, then pass
--no-build-isolation (with build isolation, the backend is not visible to the
editable build and you get ModuleNotFoundError: No module named 'mesonpy'):
# Install the build backend + tools into the active venv FIRST.
# NB: the PyPI package is `meson-python`; it provides the `mesonpy` module that
# uv's error hint refers to (there is no separate `mesonpy` distribution).
uv pip install meson-python meson ninja nanobind
# Editable install without build isolation (so the backend + rebuild hook's
# `ninja` are found in the venv, not a deleted temp build env).
uv pip install -e . --no-build-isolation
With this setup, pure-Python edits are picked up live and C++ changes trigger a
ninja rebuild on the next import dlup.
If you do not need an editable install, building and installing a regular wheel avoids the rebuild hook entirely:
uv build --wheel && uv pip install --find-links dist --force-reinstall dlup
Bazel
Bazel needs no separate install step — it builds the native extensions and resolves the Python dependencies hermetically:
# Build everything (C++ libraries + native extensions + Python package)
bazelisk build //...
# Run the Python test suite
bazelisk test //tests/python:tests
License
Apache 2.0 - see LICENSE for details.
1 maintainer
Metadata
1 maintainer
Release files for dlup 0.9.4
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|---|---|---|---|---|
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Built distributions (wheels)
Total release size: 50.7 MB
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