Struct ArmijoLineSearch

pub struct ArmijoLineSearch { /* private fields */ }

Backtracking line search evaluating the Armijo rule at each step width.

Implementations

impl ArmijoLineSearch

pub fn new( control_parameter: f64, initial_step_width: f64, decay_factor: f64, ) -> ArmijoLineSearch

Creates a new ArmijoLineSearch given the control_parameter ∈ (0, 1), the initial_step_width > 0 and the decay_factor ∈ (0, 1).

Armijo used in his paper the values 0.5, 1.0 and 0.5, respectively.

Trait Implementations

impl Clone for ArmijoLineSearch

fn clone(&self) -> ArmijoLineSearch

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ArmijoLineSearch

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl LineSearch for ArmijoLineSearch

fn search<F>( &self, function: &F, initial_position: &[f64], direction: &[f64], ) -> Vec<f64>

where F: Function1,

Performs the actual line search given the current position x and a direction to go to. Returns the new position.

impl Copy for ArmijoLineSearch