See: Description
| Interface | Description | 
|---|---|
| Preconditioner | 
 This interface represents a preconditioner for differentiable scalar
 objective function optimizers. 
 | 
| Class | Description | 
|---|---|
| NonLinearConjugateGradientOptimizer | 
 Non-linear conjugate gradient optimizer. 
 | 
| NonLinearConjugateGradientOptimizer.IdentityPreconditioner | 
 Default identity preconditioner. 
 | 
| Enum | Description | 
|---|---|
| NonLinearConjugateGradientOptimizer.Formula | 
 Available choices of update formulas for the updating the parameter
 that is used to compute the successive conjugate search directions. 
 | 
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