---
title: RankReducePaths (latest version)
description: API reference for qiskit_noise_learning.experiment_builder.RankReducePaths in the latest version of qiskit-noise-learning
source: https://quantum.cloud.ibm.com/docs/en/api/qiskit-noise-learning/generated/experiment-builder-rank-reduce-paths
---

# qiskit\_noise\_learning.experiment\_builder.RankReducePaths

*class* `qiskit_noise_learning.experiment_builder.RankReducePaths(tol: float = 1e-08)`

[GitHub](https://github.com/Qiskit/qiskit-noise-learning/tree/stable/0.1/qiskit_noise_learning/experiment_builder/stages/rank_reduce_paths.py)

Bases: [`ExperimentBuilderStage`](/docs/api/qiskit-noise-learning/generated/experiment-builder-experiment-builder-stage "qiskit_noise_learning.experiment_builder.experiment_builder_stage.ExperimentBuilderStage")

Reduce the paths to a maximal linearly independent set.

Removes linearly dependent paths from the experiment’s design matrix, updates relations accordingly, and removes any instruction sequences no longer referenced.

**Parameters**

**tol** – Tolerance for determining linear independence.

### \_\_init\_\_

`__init__(tol: float = 1e-08)`

## Methods

|                                                                                                                                                              |                                                  |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------ |
| [`__init__`](#qiskit_noise_learning.experiment_builder.RankReducePaths.__init__ "qiskit_noise_learning.experiment_builder.RankReducePaths.__init__")(\[tol]) |                                                  |
| `run`(experiment)                                                                                                                                            | Validate required fields, then apply this stage. |

## Attributes

|                    |   |
| ------------------ | - |
| `populates_fields` |   |
| `required_fields`  |   |