Two rounds, each round for 1 hour, including code + basic ML questions + project. First round is with a senior research scientist, second round with leader. Project really matters.

one interview, first describe resume, then leetcode easy problem, I didn't get best solution. After time is ending, the interviewer told me correct best solution. I was rejected 2 days later.

There are two parts. In the first part, they asked me about my research. In the second part, I was asked to solve a coding problem using whatever language. The problem is around the medium leetcode level coding problems.