Independent grain-scale tickets with no time leak need a held-out test slice and a validation slice. Which official prep split should they create?
Select an answer to reveal the explanation.
Short Explanation
Think of independent grain-scale tickets with no time leak. Create a random train, validation, and test split. Training on every row is how you skip the holdout.
Full Explanation
A proper random train, validation, and test split reduces prediction bias on i.i.d. rows. Skipping the holdout, forcing a time split on independent tickets, and Firehose miss that skill.