| Package | Description | 
|---|---|
| org.hipparchus.optim.nonlinear.scalar.gradient | This package provides optimization algorithms that require derivatives. | 
| Class and Description | 
|---|
| NonLinearConjugateGradientOptimizer.Formula Available choices of update formulas for the updating the parameter
 that is used to compute the successive conjugate search directions. | 
| Preconditioner This interface represents a preconditioner for differentiable scalar
 objective function optimizers. | 
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