| Interface | Description | 
|---|---|
| ClassificationLoss | |
| Loss | Trait for adding "pluggable" loss functions for the gradient boosting algorithm. | 
| Class | Description | 
|---|---|
| AbsoluteError | Class for absolute error loss calculation (for regression). | 
| LogLoss | Class for log loss calculation (for classification). | 
| Losses | |
| SquaredError | Class for squared error loss calculation. |