What is the approach, on a concrete, technical level, that you are taking to make recommendation N, based on the 3, 4...N-1 choices? Do you think online NNMF c

What is the approach, on a concrete, technical level, that you are taking to make recommendation N, based on the 3, 4...N-1 choices? Do you think online NNMF collaborative filtering with Spotify bands with fewer than 100,000 monthly listeners is the answer? If you had infinite resources, what would you do?