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use super::minima::OwnedRecord;
use std::sync::Arc;
#[derive(Debug, Clone)]
pub struct Particle {
pos: Vec<f64>,
vel: Vec<f64>,
min: Vec<f64>,
num_vars: usize,
pub min_cost: f64,
}
impl Particle {
pub fn new(pos: &[f64], vel: &[f64]) -> Self {
let mut pos_vec = Vec::new();
let mut vel_vec = Vec::new();
pos_vec.extend_from_slice(pos);
vel_vec.extend_from_slice(vel);
let num_vars = pos_vec.len();
Self {
min: pos_vec.clone(),
pos: pos_vec,
vel: vel_vec,
num_vars,
min_cost: std::f64::MAX,
}
}
pub fn cost_fn_mut(&mut self, objective: &mut impl FnMut(&[f64]) -> f64) -> Option<f64> {
let cost_here = objective(&self.pos);
if cost_here < self.min_cost {
self.min = self.pos.clone();
self.min_cost = cost_here;
return Some(cost_here);
}
None
}
pub fn cost_fn<T>(&mut self, objective: &Arc<T>) -> Option<f64>
where
T: Fn(&[f64]) -> f64,
{
let cost_here = objective(&self.pos);
if cost_here < self.min_cost {
self.min = self.pos.clone();
self.min_cost = cost_here;
return Some(cost_here);
}
None
}
pub fn update_syn(
&mut self,
momentum: f64,
rand_vecs: Vec<Vec<f64>>,
motion_coeffs: &[f64],
tribal_best: &[f64],
global_best: &[f64],
) {
// for (i, (p, v, m)) in izip!(
// self.pos.iter_mut(),
// self.vel.iter_mut(),
// self.min.iter_mut()
// )
// .enumerate()
// {
// // move
// *p += *v;
// // update velocity
// *v = momentum * *v
// + rand_vecs[0][i] * motion_coeffs[0] * (*m - *p)
// + rand_vecs[1][i] * motion_coeffs[1] * (tribal_best[i] - *p)
// + rand_vecs[2][i] * motion_coeffs[2] * (global_best[i] - *p);
// }
for i in 0..self.num_vars {
// move
self.pos[i] += self.vel[i];
// set velocity
self.vel[i] = momentum * self.vel[i]
+ rand_vecs[0][i] * motion_coeffs[0] * (self.min[i] - self.pos[i])
+ rand_vecs[1][i] * motion_coeffs[1] * (tribal_best[i] - self.pos[i])
+ rand_vecs[2][i] * motion_coeffs[2] * (global_best[i] - self.pos[i]);
}
}
pub fn update_sol(
&mut self,
momentum: f64,
rand_vecs: Vec<Vec<f64>>,
motion_coeffs: &[f64],
tribal_best: &[f64],
) {
// for (i, (p, v, m)) in izip!(
// self.pos.iter_mut(),
// self.vel.iter_mut(),
// self.min.iter_mut()
// )
// .enumerate()
// {
// // move
// *p += *v;
// // update velocity
// *v = momentum * *v
// + rand_vecs[0][i] * motion_coeffs[0] * (*m - *p)
// + rand_vecs[1][i] * motion_coeffs[1] * (tribal_best[i] - *p);
// }
for i in 0..self.num_vars {
// move
self.pos[i] += self.vel[i];
// set velocity
self.vel[i] = momentum * self.vel[i]
+ rand_vecs[0][i] * motion_coeffs[0] * (self.min[i] - self.pos[i])
+ rand_vecs[1][i] * motion_coeffs[1] * (tribal_best[i] - self.pos[i]);
}
}
pub fn enforce_bounds(&mut self, bound_state: (&[[f64; 2]], &[[f64; 2]], f64)) {
for (i, (p, pb)) in self.pos.iter_mut().zip(bound_state.0.iter()).enumerate() {
if *p < pb[0] {
*p = pb[0];
self.vel[i] *= bound_state.2;
} else if *p > pb[1] {
*p = pb[1];
self.vel[i] *= bound_state.2;
}
}
for (v, vb) in self.vel.iter_mut().zip(bound_state.1.iter()) {
if *v < vb[0] {
*v = vb[0];
} else if *v > vb[1] {
*v = vb[1];
}
}
}
pub fn get_record(&self) -> OwnedRecord {
OwnedRecord::build(self.min.clone(), self.min_cost)
}
}