Quasi-Newton methods
BFGS
[0] Jorge Nocedal and Stephen J. Wright (2006). Numerical Optimization. Springer. ISBN 0-387-30303-0.
pub use self::bfgs::*;
pub use self::dfp::*;
pub use self::lbfgs::*;
pub use self::sr1::*;
pub use self::sr1_trustregion::*;