Databricks Runtime 9.1 LTS ML is a machine learning runtime released by Databricks in September 2021, and it’s currently under long-term support (LTS) until September 2024.

Key features and improvements include:

• Feature Store: This allows for better management and serving of features for machine learning models. Several improvements were made in this version, including support for unsupervised learning, specifying multiple features in a single lookup, and custom paths for feature tables.

• AutoML generated notebooks: These notebooks are simplified and now incorporate preprocessing steps for date and timestamp columns within the databricks-automl-runtime package.

• Databricks Autologging (Public Preview): This feature provides a no-code solution for automatic experiment tracking of machine learning training sessions on Databricks.