The submissions are evaluated using the Root Mean Squared Error (RMSE) between the predicted and observed **log-scaled (log1p) SOC density** of soil samples in the test set:
$$ RMSE = \sqrt{(\frac{1}{n})\sum_{i=1}^{n}(y_{i} - \hat{y}_{i})^{2}} $$


## Submission File
For each `sample_id` in the test set, the participants must predict the SOC content `logoc_d.f` . The file should contain a header and have the following format:
```
sample_id,logoc_d.f
1012,0.54321
5006,1.54321
9999,2.54321
 ```