Data - train, test and ground truth clarification

Hi, I just want to clarify if my understanding of the data and expected output is correct.

1. The final submission csv should contain the same 805 “videoId” and “frameId” combinations (rows) that are in “player_coords.csv”, just with the coordinates (“cords”) for the top-down rink view (“rink.jpg”), correct?
2. Are the “cords” values in the 660 rows in “sample_submission.csv” the GROUND TRUTH for those “videoId” and “frameId” combinations that we can use to train our models?
3. If #2. is correct, that means the 145 rows that are in “player_coords.csv” but not in “sample_submission.csv” represent the test set, correct?

Please confirm my understanding above or correct anything I’m misunderstanding. Thanks.

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