Basic conception in the field. The basic process to handle particular problems. Algorithms are also important too. Be careful to prepare for an online algorithm test, quite important. One more thing, relax and be confident, they pay attention to this. They do not like to hire someone who just wants to finish an internship but students who plan to work there after graduation.

2 interviews, During first interview we talked about past projects and some details related to those projects. They asked very small details to make sure you actually did what you wrote on resume. Second interview I met an HR and Team lead and a team member. HR asked some admin questions: when to start, etc Team lead asked some behaviour questions teammember asked some technical question including some machine learning conceptural problem and a coding question.