Polars backend is based on the Polars DataFrame library. Currently the Polars backend works only in the single node mode (you cannot distribute calculations accross the cluster). But it is really fast and this is the best option if you want to setup simple MLOps solution.

To configure the polars offline store edit feature_store.yaml

project: feature_repo
registry: data/registry.db
provider: local
    type: yummy.YummyOfflineStore
    backend: polars