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

# Sequences

`qiskit_noise_learning.sequences`

Path and instruction sequences.

## Classes

|                                                                                                                                                                      |                                                                                      |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------ |
| [`ApplyGate`](/docs/api/qiskit-noise-learning/generated/sequences-apply-gate "qiskit_noise_learning.sequences.ApplyGate")                                            | An instruction that applies a fixed gate.                                            |
| [`FidelityIndex`](/docs/api/qiskit-noise-learning/generated/sequences-fidelity-index "qiskit_noise_learning.sequences.FidelityIndex")                                | Index data for a fidelity in a Pauli-MCM-reset gate set.                             |
| [`InstructionSequence`](/docs/api/qiskit-noise-learning/generated/sequences-instruction-sequence "qiskit_noise_learning.sequences.InstructionSequence")              | A sequence of instructions.                                                          |
| [`LogPathMap`](/docs/api/qiskit-noise-learning/generated/sequences-log-path-map "qiskit_noise_learning.sequences.LogPathMap")                                        | The linear map from a space of log fidelities to its associated log path space.      |
| [`LogPathSpace`](/docs/api/qiskit-noise-learning/generated/sequences-log-path-space "qiskit_noise_learning.sequences.LogPathSpace")                                  | The (infinite-dimensional) space of log path-fidelities.                             |
| [`PartialPauliPermutation`](/docs/api/qiskit-noise-learning/generated/sequences-partial-pauli-permutation "qiskit_noise_learning.sequences.PartialPauliPermutation") | Partially-specified permutations of the single-qubit phaseless Paulis on `n` qubits. |
| [`Path`](/docs/api/qiskit-noise-learning/generated/sequences-path "qiskit_noise_learning.sequences.Path")                                                            | A sequence of fidelity indices.                                                      |

## Functions

|                                                                                                                                                                                                              |                                                                                  |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------- |
| [`group_mergeable_instruction_sequences`](/docs/api/qiskit-noise-learning/generated/sequences-group-mergeable-instruction-sequences "qiskit_noise_learning.sequences.group_mergeable_instruction_sequences") | Group the positions of instruction sequences that can be merged with each other. |