https://app.fleshner.com/_temp/kwb_004203676254/_definitions/mychatgpt.definition.kwb_004203676254.machine_learning_basics.cross_validation.txt,
https://app.fleshner.com/_temp/kwb_004203676254/_definitions/mychatgpt.keywords.kwb_004203676254.machine_learning_basics.cross_validation.txt,