---
title: optimization (latest version)
description: API reference for qiskit_fermions.mappers.optimization in the latest version of qiskit-fermions
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit-fermions/mappers-optimization
---

# Mapper Optimizations

This module provides various routines for optimizing fermion-to-qubit mappings. Their specific nature can vary greatly, so refer to the docstrings of each individual function for more details.

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| [`build_excitation_span_minimization_model`](/docs/api/qiskit-fermions/mappers-optimization-build-excitation-span-minimization-model#qiskit_fermions.mappers.optimization.build_excitation_span_minimization_model "qiskit_fermions.mappers.optimization.build_excitation_span_minimization_model")(...) | Build a Pyomo model for ordering fermionic modes to minimize excitation spans. |