# Module: mlmd

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| [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/google/ml-metadata/blob/v1.17.1/ml_metadata/__init__.py) |

Init module for ML Metadata.

## Classes

[`class ListOptions`](https://www.tensorflow.org/tfx/ml_metadata/api_docs/python/mlmd/ListOptions): Defines the available options when listing nodes.

[`class MetadataStore`](https://www.tensorflow.org/tfx/ml_metadata/api_docs/python/mlmd/MetadataStore): A store for the metadata.

[`class OrderByField`](https://www.tensorflow.org/tfx/ml_metadata/api_docs/python/mlmd/OrderByField): Defines the available fields to order results in ListOperations.

## Functions

[`downgrade_schema(...)`](https://www.tensorflow.org/tfx/ml_metadata/api_docs/python/mlmd/downgrade_schema): Downgrades the db specified in the connection config to a schema version.