build a recommender system that uses the KNN algorithm.The dataset to be used is Movielens dataset.

1)What is the approach to KNN

2)Apply matrix factorization to the dataset

3)What is the maximum dataset that the recommender system can use?

4)What is the time complexity of your recommender system?

5)What is the performance of your recommender system?

6)Is there a way to scale-up your recommender system to work with very large datasets?

The link to dataset is given below:

https://grouplens.org/datasets/movielens/20m/