CertPrepNow
DatabricksML Professional99 cards3 domains

ML Professional Flashcards

Active recall study cards for the Databricks Certified Machine Learning Professional exam. Flip each card to reveal the answer, filter by domain, or shuffle for spaced repetition.

0 / 99 cards reviewed0% done
x
Card 1 of 99
model-development

What is the mandatory final feature-preparation stage in every SparkML Pipeline?

Click to reveal answer

Answer

VectorAssembler. SparkML models require all feature columns combined into a single Vector column immediately before the algorithm stage. Without VectorAssembler, the model stage receives individual columns and throws a schema error. It is the last feature-engineering step before the estimator — scalers or other transformers may precede it.

Click to flip back

Tip: Use Space to flip, ← / → to navigate

Ready for the real thing?

Take a timed ML Professionalmock exam to test what you've learned.