C3_W2_Practice Lab 2. same user id gets displayed five times

Course Q&A Machine Learning Specialization Unsupervised Learning, Recommenders, Reinforcement
1

I think this is an error, the function is supposed to view 5 samples of user_train data but they show the same user id

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2

Hello @tinted,

Each row represents one rating from one user for one movie. This table is showing the user part for 5 ratings, and if those ratings are from the same user, then it will be like that.

Cheers,
Raymond

1 Like
3

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I should have included this as well but the above image is the description/analysis of the data displayed. The way I understand is that it is not Users x Movies but User x User Features

Edit: Actually, you are right, That last line “The user vector is the same for all the movies rated by a user” explains it that it is indeed Users x Movies and that the rows will be same for all the movies rated by a single user

4

I still have hard time imagining how the data is stored in that “user_train” . I will edit the code and check more samples after the assignment for more clarity

5

Sure. We can discuss about your findings if needed.

Good luck!

6

Ok, I printed 100 samples and there are other user IDs as well. So basically it is
( User x Movies ) flattened vs User Features

But the movies from the same users have the same row vector since the values are from Users x User Features