movieId userId  rating
1            1     1.0
1            2     4.5
1            5     5.0
1            8     5.0
1           10     5.0
2            1     2.0
2            3     4.5
2            5     5.0
2            6     3.0
2            8     4.0

{
   0:[1.0, 4.5, 0.0, 0.0, 5.0, 0.0, 0.0, 5.0, 0.0, 5.0]
   1:[2.0, 0.0, 4.5, 0.0, 5.0, 3.0, 0.0, 4.0, 0.0, 0.0]
}

def build_rating_vector_for_movie(movie_id, num_users):
    rating_vector = [0] * num_users
    movie_group = user_rating_by_movie.get_group(movie_id)

    for u, r in zip(movie_group.userId.values, movie_group.rating.values):
        rating_vector[u - 1] = r

    movie_user_ratings[movie_id] = rating_vector