FIESTA: Field Interpolation and Estimation using Spatial Techniques and Algorithms¶

Introduction¶

FIESTA is a python library for general interpolation from uniform and non-uniform input points. The library is written in python with numba acceleration for speed. The library has the optional capability to be used on large data-sets by distributing jobs across multiple processes via MPI. This relies on the mpi4py library and the MPI object from the shift-fft package (see here) which is passed as an additional object into MPI related functions.

Showcase¶

The 2D density field computed with FIESTA (from the outputs of a cosmological simulation):

The velocity-field along the z-axis computed with FIESTA (from the outputs of a cosmological simulation):

Contents¶

Dependencies¶

numba
numpy
scipy
shift-fft
mpi4py [Optional: enables MPI distributed processes]

Installation¶

FIESTA can be installed via pip:

pip install fiesta-pkg

or by cloning the repository:

git clone https://github.com/knaidoo29/FIESTA.git
cd FIESTA
pip install .

Once this is done you should be able to call FIESTA from python:

import fiesta

To use the MPI functionality please take a look at the documentation in FIESTA which instructs users how to use the shift-fft MPI object and how to run these distributed jobs successfully without errors or MPI related hanging.

Citation¶

If you use FIESTA in your work, please cite:

@software{naidoo_fiesta_2026,
  author       = {Krishna Naidoo},
  title        = {FIESTA: Field Interpolation and Estimation using Spatial Techniques and Algorithms},
  month        = may,
  year         = 2026,
  publisher    = {Zenodo},
  doi          = {10.5281/zenodo.20328944},
  url          = {https://doi.org/10.5281/zenodo.20328944},
}

Support¶

If you have any issues with the code or want to suggest ways to improve it please open a new issue (here) or (if you don’t have a github account) email krishna.naidoo.11@ucl.ac.uk.