In this task I do the first activity proposed on the lecture 19, analysing the sparsity of the dataset of MovieLens.
My notebook can be found in the next link:
https://colab.research.google.com/drive/1RO-tVj0hhbLLkVfc95Z9BXsxAmUTQJE9?usp=sharing
In case the link doesn't work, I also attach the file: