Struct WeakBound 

pub struct WeakBound {
    pub row: usize,
    pub var_row: usize,
    pub lower: bool,
}

The step for the whole perturbation under the active set the path has reached: released bounds out of the operator with their multipliers constrained to stay at zero, and held variables kept where they are.

The multiplier constraint is not optional. The re-factored released operator drops the bound’s diagonal term, but the factor’s complementarity row for that bound still couples the direction through the base slack and multiplier it was built from, and without the constraint the released direction is measurably wrong: on a two-variable QP the free direction after a release came back [1.154, 0.194] against the analytic [1.227, 0.454]. A bound the classifier could not call active or inactive at the base point: variable on the bound with a multiplier of the same order as the slack, both order sqrt(mu). The solution map has a kink there, and no single linear step is right for both sides.

Fields

row: usize

Bound-multiplier row in the compound KKT vector.

var_row: usize

Var-x row of the variable the bound covers.

lower: bool

true when the bound is the variable’s lower bound.

Trait Implementations

impl Clone for WeakBound

fn clone(&self) -> WeakBound

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for WeakBound

impl Debug for WeakBound

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

Formats the value using the given formatter.