Two phone interviews and one on-site interview in 3 days. The interview process was very smooth and efficient.
First phone interview was conducted by HR, was asked questions based on my resume; followed by a second phone interview with CTO the next day, was asked questions on evaluation measures of ranked information retrieval results.
On the third day, I was invited to an on-site interview, which was conducted by an panel of experts. I was asked about machine learning and image processing projects I did. Duration was about 1 hour. Got results in a week. Because I only have 1.5 months available for internship and the normal internship period is 6 months with a minimum of 2 months, I was not offered this internship.