Regularization configuration
| Union Case | Description | 
| 
            L1Reg(D)
          
            Signature: D | |
| 
            L2Reg(D)
          
            Signature: D | |
| 
            NoReg
          
            Signature:  | 
| Instance member | Description | 
| 
            Func
          
            Signature: DV -> D | 
| Static member | Description | 
| 
            DefaultL1Reg
          
            Signature: Regularization | |
| 
            DefaultL2Reg
          
            Signature: Regularization |