•  16-10-2019
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Question

I want to analyze MovieLens data set and load on my machine the M1 file. I combine actually two data files (ratings.dat and movies.dat) and sort the table according 'userId' and 'Time' columns. The head of my DataFrame looks like here (all columns values are corresponding to the original data sets):

In [36]: df.head(10)
Out[36]: 
        userId  movieId  Rating       Time                         movieName  \
40034        1      150       5  978301777                  Apollo 13 (1995)   
77615        1     1028       5  978301777               Mary Poppins (1964)   
550485       1     2018       4  978301777                      Bambi (1942)   
400889       1     1962       4  978301753         Driving Miss Daisy (1989)   
787274       1     1035       5  978301753        Sound of Music, The (1965)   
128308       1      938       4  978301752                       Gigi (1958)   
497972       1     3105       5  978301713                 Awakenings (1990)   
28417        1     2028       5  978301619        Saving Private Ryan (1998)   
6551         1     1961       5  978301590                   Rain Man (1988)   
35492        1     2692       4  978301570  Run Lola Run (Lola rennt) (1998)   

                            genre  
40034                       Drama  
77615   Children's|Comedy|Musical  
550485       Animation|Children's  
400889                      Drama  
787274                    Musical  
128308                    Musical  
497972                      Drama  
28417            Action|Drama|War  
6551                        Drama  
35492        Action|Crime|Romance  

[10 rows x 6 columns]

I can not understand that the same user with user Id 1 see or rated the different movies (Apollo13 (Id:150), Mary Poppins (Id:1028) and Bambi (Id:2018) exactly at the same time (up to the milleseconds). If somebody works already with this data set, please, clear this situation.

Was it helpful?

Solution

When you enter ratings on movie lens, you get pages with 10 movies or so. You set all the ratings, then submit by clicking "next page" or something. So I guess all the ratings for the same page are received at the same time, when you submit the page.

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