Research based. on my project, basic concept. understanding of state of art technology. Introduced my research background and previous projects. and the interviewer asked some question regarding my answer. I also asked several questions.
First round was a short phone interview with the hiring manager to ensure match of interests. second round was a 1 hr interview with a team member about my relevant past projects, challenges and solutions.
Mainly to discuss with mentor. Several medium level leetcode coding problems plus some math problems. As a research intern interview, it is natural that different supervisors would have different preference for his/her candidates.
Interview questions [1]
Question 1
Machine Learning basic concepts plus several leetcode problems.