Hi, this is quite a general question, I've put together a list of bullets that will help you in the right direction:
-
Focus on organized storage, flexible transformations, and making features easy to reuse and discover. Use Unity Catalog for governance and collaboration, and persist features as managed Delta tables designated as feature tables.
-
Start with Spark or Pandas to transform raw data: handle missing values, normalize, encode categorical variables, create aggregations, and experiment with domain-specific features. Persist outputs in Unity Catalog feature tables to support both batch and real-time use and keep training and inference consistent.
-
Group features by domain or use case, use clear descriptive names, separate sensitive features to maintain proper access controls, and track ownership and lineage in Unity Catalog so teams can find, understand, and troubleshoot features quickly.
-
Assemble training datasets by consistently joining on entity keys and timestamps from feature tables, using point-in-time logic to avoid leakage. Build reusable functions or utilities so the same retrieval and joins are used during training and inference to reduce trainโserve mismatches.
-
Encourage collaboration and sharing across teams to avoid duplicating effort and to reuse proven features, speeding up experimentation. Use table comments, tags, and metadata in Unity Catalog to improve discoverability.
-
Work with diverse data types: numeric, categorical, arrays such as embeddings, and structured data. Transform unstructured inputs (text, images, logs) into model-ready features and store them in feature tables with appropriate schemas.
-
Use AutoML for faster prototyping. It can automate preprocessing and feature engineering and produce code you can inspect and adapt for production pipelines.
-
Profile and visualize data to find issues and opportunities to improve feature quality. Apply consistent strategies for handling missing data, detecting outliers, and scaling values. Document transformations and rely on Unity Catalog lineage to support explainability and compliance.
-
In summary, use Unity Catalog feature tables as your central, governed store for features; rely on scalable Spark-based transformations; design for reuse and security; and standardize feature retrieval logic to keep training and inference in sync, enabling reliable, production-ready ML.
