I only spoke with the unit supervisor during the interview. The main questions asked were about self-introduction and past project experiences. The supervisor interested in working on NLP-related tasks, so most of the questions were related to text processing and modeling. It was easy to answer as long as you had relevant experience.

I had 5 total interviews/calls in total - way too much time invested for an intern interview. Also, one of the interviewers was extremely rude and told me I was making no sense during the interviews but he was the one not paying attention (he did not have my resume pulled up).