---
title: metadata (latest version)
description: API reference for qiskit_addon_obp.utils.metadata in the latest version of qiskit-addon-obp
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit-addon-obp/utils-metadata
---

# Metadata utilities

`qiskit_addon_obp.utils.metadata`

Container classes for holding backpropagation metadata.

|                                                                                                                             |                                                                                  |
| --------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------- |
| [`OBPMetadata`](/docs/api/qiskit-addon-obp/utils-metadata-obp-metadata "qiskit_addon_obp.utils.metadata.OBPMetadata")       | A container for metadata generated during the `backpropagate()` method.          |
| [`SliceMetadata`](/docs/api/qiskit-addon-obp/utils-metadata-slice-metadata "qiskit_addon_obp.utils.metadata.SliceMetadata") | A container for metadata generated during the backpropagation of a single slice. |