Submissions are evaluated on the mean
[Spearman's correlation coefficient](https://en.wikipedia.org/wiki/Spearman%27s_rank_correlation_coefficient)
. To calculate this, the Spearman's rank correlation is computed for each set of 5 images. Identical predicted values are assigned fractional ranks equal to the average of their positions in the sorted values. These correlations are then averaged to create the score for the leaderboard.
Submission File
For each set of 5 images, you should predict a space-delimited list of the correct day for each respective image. For example, "1,3 1 2 5 4" implies that for setId = 1, the image set1_1 occurred third, set1_2 occurred first, set1_3 occurred second, set1_4 occurred fifth, and set1_5 occurred fourth.
The file should contain a header and have the following format:
setId,day
1,1 2 3 4 5
2,1 2 3 4 5
3,1 2 3 4 5
etc.