Amazon Lab126 Research Scientist interview questions

First round is research interview and second one is coding. Very comfortable process, just casual talk thru the phone. Overall, it was good experience. I am working with the team now. It should be thirty words now.

2 remote interviews of 45 minutes each, both technical, one site one hour PhD thesis presentation followed by 5 interviews 45 minutes each, 1 HR and 4 technical. Got asked about supervised and unsupervised machine learning, operations research, linear algebra, computer science (algorithm & data structures). Interviewers were very friendly and calm, I didn't feel stressed. They expect deep knowledge in machine learning and deep learning.