A good reference for matrix completion [closed]

1. What is the matrix completion problem?
2. Is Matrix completion machine learning?

What is the matrix completion problem?

In statistical learning point of view, the matrix completion problem is an application of matrix regularization which is a generalization of vector regularization. For example, in the low-rank matrix completion problem one may apply the regularization penalty taking the form of a nuclear norm.

Is Matrix completion machine learning?

This work applies Matrix Completion (MC) – a class of machine-learning methods commonly used in recommendation systems – to analyze economic complexity.