Each submission has to be UTF-8 encoding without a BOM. The submitted file should contain two columns, each with a header 'test_id' or 'count'. You need to predict the values under 'count'. You can use float numbers like 5.3 to indicate that the order count is a bit greater than 5 but less than 6. The submission file should look like this:
You can download the sample submission file here at the data site.
Submissions are evaluated according to the Mean Absolute Error.