---
title: models (latest version)
description: API reference for qiskit_noise_learning.models in the latest version of qiskit-noise-learning
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit-noise-learning/models
---

# Models

`qiskit_noise_learning.models`

Gate set noise models.

## Classes

|                                                                                                                                                          |                                                                                                                                                                                                   |
| -------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [`IdentityFidelityModel`](/docs/api/qiskit-noise-learning/generated/models-identity-fidelity-model "qiskit_noise_learning.models.IdentityFidelityModel") | A fidelity model whose parameters are the log fidelities themselves.                                                                                                                              |
| [`LogFidelitySpace`](/docs/api/qiskit-noise-learning/generated/models-log-fidelity-space "qiskit_noise_learning.models.LogFidelitySpace")                | The space of log fidelities of a gate set.                                                                                                                                                        |
| [`GeneratorIndex`](/docs/api/qiskit-noise-learning/generated/models-generator-index "qiskit_noise_learning.models.GeneratorIndex")                       |                                                                                                                                                                                                   |
| [`PauliLindbladModel`](/docs/api/qiskit-noise-learning/generated/models-pauli-lindblad-model "qiskit_noise_learning.models.PauliLindbladModel")          | A linear mapping from Pauli-Lindblad generator rates to log fidelities.                                                                                                                           |
| [`RateSpace`](/docs/api/qiskit-noise-learning/generated/models-rate-space "qiskit_noise_learning.models.RateSpace")                                      | Space of Pauli-Lindblad generator rates, indexed by [`GeneratorIndex`](/docs/api/qiskit-noise-learning/generated/models-generator-index "qiskit_noise_learning.models.GeneratorIndex").           |
| [`PauliLindbladSplit`](/docs/api/qiskit-noise-learning/generated/models-pauli-lindblad-split "qiskit_noise_learning.models.PauliLindbladSplit")          | The decomposition of a map around its underlying [`PauliLindbladModel`](/docs/api/qiskit-noise-learning/generated/models-pauli-lindblad-model "qiskit_noise_learning.models.PauliLindbladModel"). |

## Functions

|                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                       |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [`contains_pauli_lindblad_model`](/docs/api/qiskit-noise-learning/generated/models-contains-pauli-lindblad-model "qiskit_noise_learning.models.contains_pauli_lindblad_model")(model) | Whether a map is, or contains, a [`PauliLindbladModel`](/docs/api/qiskit-noise-learning/generated/models-pauli-lindblad-model "qiskit_noise_learning.models.PauliLindbladModel").                                                                                                                     |
| [`get_noise_site`](/docs/api/qiskit-noise-learning/generated/models-get-noise-site "qiskit_noise_learning.models.get_noise_site")(model)                                              | The noise-site mapping of the map's [`PauliLindbladModel`](/docs/api/qiskit-noise-learning/generated/models-pauli-lindblad-model "qiskit_noise_learning.models.PauliLindbladModel"), if it has exactly one.                                                                                           |
| [`is_fidelity_model`](/docs/api/qiskit-noise-learning/generated/models-is-fidelity-model "qiskit_noise_learning.models.is_fidelity_model")(model)                                     | Whether an object is a [`LinearMap`](/docs/api/qiskit-noise-learning/generated/math-linear-map "qiskit_noise_learning.math.LinearMap") with a [`LogFidelitySpace`](/docs/api/qiskit-noise-learning/generated/models-log-fidelity-space "qiskit_noise_learning.models.LogFidelitySpace") output space. |
| [`split_pauli_lindblad_model`](/docs/api/qiskit-noise-learning/generated/models-split-pauli-lindblad-model "qiskit_noise_learning.models.split_pauli_lindblad_model")(model)          | Split a map around its underlying [`PauliLindbladModel`](/docs/api/qiskit-noise-learning/generated/models-pauli-lindblad-model "qiskit_noise_learning.models.PauliLindbladModel").                                                                                                                    |

## Type aliases

### qiskit\_noise\_learning.models.FidelityModel

alias of [`LinearMap`](/docs/api/qiskit-noise-learning/generated/math-linear-map "qiskit_noise_learning.math.linear_map.LinearMap")\[[`Hashable`](https://docs.python.org/3/library/collections.abc.html#collections.abc.Hashable), [`FidelityIndex`](/docs/api/qiskit-noise-learning/generated/sequences-fidelity-index "qiskit_noise_learning.sequences.fidelity_index.FidelityIndex")]