GrassmannTN: a Python package for Grassmann tensor network computations

TL;DR

GrassmannTN is a Python package that simplifies Grassmann tensor network computations, automating fermionic sign factors and enhancing code readability for numerical simulations.

Contribution

It introduces a user-friendly Python toolkit for Grassmann tensor networks, automating sign calculations and focusing on clear tensor manipulation functions.

Findings

Automates fermionic sign factor calculations.

Supports Grassmann tensor renormalization group computations.

Enhances code readability for tensor manipulations.

Abstract

We present GrassmannTN, a Python package for the computation of the Grassmann tensor network. The package is built to assist in the numerical computation without the need to input the fermionic sign factor manually. It prioritizes coding readability by designing every tensor manipulating function around the tensor subscripts. The computation of the Grassmann tensor renormalization group and Grassmann isometries using GrassmannTN are given as the use case examples.