masspcf 0.4.1

Massively parallel computations for piecewise constant functions

masspcf

Copyright 2024-2026 Björn H. Wehlin

Description

masspcf is a Python package with its backend written in C++ and CUDA for performing highly scalable computations involving piecewise constant functions (PCFs). The primary audience is practicioners within Topological Data Analysis (TDA) wanting to do statistical analysis on invariants such as stable rank, Euler characteristic curves, Betti curves, and so on.

The basic objects are numpy-like (multidimensional) arrays of PCFs, on which we support reductions such as taking averages across a dimension, etc. For 1-D arrays, we compute Lp distance matrices and L2 kernels that can then be used as input for, e.g., clustering, SVMs, and other machine learning algorithms.

Installing

masspcf can be used on all three major platforms. Pre-built wheels with CUDA support are available from PyPI:

pip install masspcf

For building from source (e.g. from a git checkout), a C++20 compiler is required. CUDA support is optional and auto-detected; see the build instructions for details.

For any issues installing or using masspcf, please file an issue on this GitHub repo.

Citing

If you use masspcf in your research, please use the following BibTeX citation.

@misc{masspcf,
      title={Massively Parallel Computation of Similarity Matrices from Piecewise Constant Invariants}, 
      author={Bj\"{o}rn H. Wehlin},
      year={2024},
      eprint={2404.07183},
      archivePrefix={arXiv},
      primaryClass={stat.CO}
}

Acknowledgment

This work was partially supported by the Wallenberg AI, Autonomous Systems and Software Program (WASP) funded by the Knut and Alice Wallenberg Foundation.