The widespread use in applied topology of the barcode of filtered cellular complexes rests on a balance between discriminatory power and computability. It has long been envision that the strength of this invariant could be increase using cohomology operations. This package computes the recently defined Sqk-barcodes which have been shown to effectively increase the discriminatory power of barcodes on real-world data.

For a complete presentation of these invariants please consult Persistence Steenrod modules by U. Lupo, A. Medina-Mardones and G. Tauzin.

steenroder is distributed under the MIT license.

Please visit https://steenroder.github.io/steenroder/ and navigate to the version you are interested in.

A number of tutorial notebooks are available in notebooks/. Example notebooks that reproduce the case studies explored in the paper are available in notebooks/examples/.

The latest stable version of steenroder requires:

• python (>= 3.8)
• numpy (>= 1.19.1)
• numba (>= 0.53.0)
• psutils (>= 5.8.0)
• gudhi (>= 3.5.0)
• plotly (>= 5.3.1)

To run the examples, jupyter is required.

The simplest way to install steenroder is using pip :

python -m pip install -U steenroder

If necessary, this will also automatically install all the above dependencies. Note: we recommend upgrading pip to a recent version as the above may fail on very old versions.

We welcome new contributors of all experience levels. The Steenroder community goals are to be helpful, welcoming, and effective. To learn more about making a contribution to steenroder, please consult the relevant page.

After developer installation, you can launch the test suite from outside the source directory:

pytest steenroder

• Official source code repo: https://github.com/Steenroder/steenroder
• Download releases: https://pypi.org/project/steenroder/
• Issue tracker: https://github.com/Steenroder/steenroder/issues

If you use steenroder in a scientific publication, we would appreciate citations to the following paper:

Persistence Steenrod modules

You can use the following BibTeX entry:

@article{steenroder,
   author = {{Lupo}, Umberto and {Medina-Mardones}, Anibal M. and {Tauzin}, Guillaume},
   title = "{Persistence Steenrod modules}",
   journal = {Journal of Applied and Computational Topology},
   year = {2022},
   doi = {10.1007/s41468-022-00093-7},
   URL = {https://doi.org/10.1007/s41468-022-00093-7}
}

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