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.BracketingStep | Deprecated As of v3.3, this class is not used anymore. | 
| 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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