Library for computing persistent homology
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Dionysus 2

Dionysus is a computational topology package focused on persistent homology. It is written in C++, with Python bindings. The second version (previous version) is re-written from scratch, which helps it accomplish a few goals:

  • Modified BSD license (because GPL causes too many problems in academic software).
  • No dependency on Boost.Python; Dionysus 2 uses (and includes) PyBind11 instead, which greatly simplifies installation.
  • Cleaner, more consistent internal design (for example, all algorithms support arbitrary fields).
  • Some new algorithms, e.g., omni-field persistence and Wasserstein and bottleneck distance computation from Hera.
  • A few plotting routines, based on Matplotlib.
  • Better integration with NumPy.

Features that haven't (yet) made it over from Dionysus 1 include vineyards. Alpha shape filtrations are available via DioDe.

  • Boost, although Dionysus 2 doesn't link any of its libraries, so it's considerably easier to build the project.
  • (Optional) SciPy for the LSQR routine used in circular coordinates.
  • (Optional) Maplotlib for plotting.
  • Boost needs to be at least version 1.55.
  • If you are using GCC, the oldest supported version is 5.4.
  • please use the dionysus mailing list for all questions and discussion related to the library;
  • GitHub's issue tracker is a central location for bug reports and feature requests.

Get, Build, Install

The simplest way to install Dionysus, as a Python package, is from PyPI:

pip install --verbose dionysus

Pass --upgrade to pip, if you have already installed some version of Dionysus.

Alternatively, you can install it directly from the development repository (this gives you the latest version):

pip install --verbose git+

Alternatively, you can clone and build everything by hand. To get Dionysus 2, either clone its repository:

git clone

or download it as a Zip archive.

To build the project:

mkdir build
cd build
cmake ..

To use the Python bindings, either launch Python from .../build/bindings/python or add this directory to your PYTHONPATH variable, by adding:

export PYTHONPATH=.../build/bindings/python:$PYTHONPATH

to your ~/.bashrc or ~/.zshrc.


Documentation for Dionysus can be found here.