Control the Validation Sample Size

By default, Narrator uses the last 3 months of data to run the validation tests.

Now users will have more control over the validation step of adding a transformation.
They'll choose how they want to balance accuracy vs speed in the validation process. If users want to increase the accuracy of the tests, they can increase the number of months of data used in validation. If they want to increase the speed of the tests, they can decrease the months.

How to change the validation sample size

Control the validation months by going to Company Settings > Processing Configuration.

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