Machine Learning Research Intern applicants have rated the interview process at Apple with 1 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 64% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -
Trivial process. I did 5 interviews and was grilled on past research experience and talked through some of the org's current research initiatives. There was a resume grill and several behavioral. No technical questions were asked apart from a dive into my research.