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

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

*class* `qiskit_noise_learning.experiment_builder.AddPaths(*path_iterators: Iterator[Path])`

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

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

Add paths to an experiment.

This is both a concrete stage (pass path iterators directly) and the base class for path-generator stages that compute paths from the experiment at runtime.

Subclasses should override `_generate_paths()` to yield paths computed from the experiment’s fidelity model or other data.

**Parameters**

**path\_iterators** – One or more iterators of [`Path`](/docs/api/qiskit-noise-learning/generated/sequences-path "qiskit_noise_learning.sequences.Path") instances.

### \_\_init\_\_

`__init__(*path_iterators: Iterator[Path])`

## Methods

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

## Attributes

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