| 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. 
 |