The evaluation metric for this competition is RMSE (Root Mean Square Error).

## Submission Format

For every row in the test dataset, submission files (*.csv) should contain two columns: id and rating. 

The file should contain a header and have the following format:
```
id, rating
1,5
2,4
3,4
```
Note that the id column in the solution submission is just the row number in the ```review_test_post.tsv``` file (the id of 1 is the first review, the id of 2 is the second review, etc.; the last id is 250997)