|
1
|
|
|
# Author: Simon Blanke |
|
2
|
|
|
# Email: [email protected] |
|
3
|
|
|
# License: MIT License |
|
4
|
|
|
|
|
5
|
|
|
|
|
6
|
|
|
import random |
|
7
|
|
|
|
|
8
|
|
|
import numpy as np |
|
9
|
|
|
|
|
10
|
|
|
from ...base_optimizer import BaseOptimizer |
|
11
|
|
|
from ...base_positioner import BasePositioner |
|
12
|
|
|
|
|
13
|
|
|
|
|
14
|
|
|
class ParticleSwarmOptimizer(BaseOptimizer): |
|
15
|
|
|
def __init__(self, *args, **kwargs): |
|
16
|
|
|
super().__init__(*args, **kwargs) |
|
17
|
|
|
|
|
18
|
|
|
def _init_particles(self, _cand_): |
|
19
|
|
|
_p_list_ = [Particle() for _ in range(self._arg_.n_part)] |
|
20
|
|
|
for i, _p_ in enumerate(_p_list_): |
|
21
|
|
|
_p_.nr = i |
|
22
|
|
|
_p_.pos_current = _cand_._space_.get_random_pos() |
|
23
|
|
|
_p_.pos_best = _p_.pos_current |
|
24
|
|
|
_p_.velo = np.zeros(len(_cand_._space_.para_space)) |
|
25
|
|
|
|
|
26
|
|
|
return _p_list_ |
|
27
|
|
|
|
|
28
|
|
|
def _move_positioners(self, _cand_, _p_list_): |
|
29
|
|
|
for _p_ in _p_list_: |
|
30
|
|
|
r1, r2 = random.random(), random.random() |
|
31
|
|
|
|
|
32
|
|
|
A = self._arg_.w * _p_.velo |
|
33
|
|
|
B = self._arg_.c_k * r1 * np.subtract(_p_.pos_best, _p_.pos_current) |
|
34
|
|
|
C = self._arg_.c_s * r2 * np.subtract(_cand_.pos_best, _p_.pos_current) |
|
35
|
|
|
|
|
36
|
|
|
new_velocity = A + B + C |
|
37
|
|
|
|
|
38
|
|
|
_p_.velo = new_velocity |
|
39
|
|
|
_p_.pos_new = _p_.move_part(_cand_, _p_.pos_current) |
|
40
|
|
|
|
|
41
|
|
|
def _eval_particles(self, _cand_, _p_list_, X, y): |
|
42
|
|
|
for _p_ in _p_list_: |
|
43
|
|
|
_p_.score_new = _cand_.eval_pos(_p_.pos_new, X, y) |
|
44
|
|
|
|
|
45
|
|
|
if _p_.score_new > _cand_.score_best: |
|
46
|
|
|
_cand_, _p_ = self._update_pos(_cand_, _p_) |
|
47
|
|
|
|
|
48
|
|
|
def _iterate(self, i, _cand_, _p_list_, X, y): |
|
49
|
|
|
self._move_positioners(_cand_, _p_list_) |
|
50
|
|
|
self._eval_particles(_cand_, _p_list_, X, y) |
|
51
|
|
|
|
|
52
|
|
|
return _cand_ |
|
53
|
|
|
|
|
54
|
|
|
def _init_opt_positioner(self, _cand_, X, y): |
|
55
|
|
|
_p_list_ = self._init_particles(_cand_) |
|
56
|
|
|
|
|
57
|
|
|
return _p_list_ |
|
58
|
|
|
|
|
59
|
|
|
|
|
60
|
|
|
class Particle(BasePositioner): |
|
61
|
|
|
def __init__(self): |
|
62
|
|
|
self.nr = None |
|
63
|
|
|
self.velo = None |
|
64
|
|
|
|
|
65
|
|
|
def move_part(self, _cand_, pos): |
|
66
|
|
|
pos_new = (pos + self.velo).astype(int) |
|
67
|
|
|
# limit movement |
|
68
|
|
|
n_zeros = [0] * len(_cand_._space_.dim) |
|
69
|
|
|
return np.clip(pos_new, n_zeros, _cand_._space_.dim) |
|
70
|
|
|
|
SimonBlanke /
Hyperactive
