pso2keras pypi 패키지 생성
iris xor 검증 자료 수정
This commit is contained in:
jung-geun
2023-07-12 19:31:54 +09:00
parent 7d22ededc7
commit 5494df2bc3
25 changed files with 1718 additions and 60 deletions

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build/lib/pso/__init__.py Normal file
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from .optimizer import Optimizer
from .particle import Particle
# from .optimizer_target import Optimizer_Target
__version__ = '0.1.0'
__all__ = [
'Optimizer',
'Particle',
# 'Optimizer_Target'
]

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build/lib/pso/optimizer.py Normal file
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import gc
import json
import os
import sys
from datetime import datetime
import numpy as np
import tensorflow as tf
from tensorflow import keras
from tqdm import tqdm
from .particle import Particle
gpus = tf.config.experimental.list_physical_devices("GPU")
if gpus:
try:
# tf.config.experimental.set_visible_devices(gpus[0], "GPU")
# print(tf.config.experimental.get_visible_devices("GPU"))
tf.config.experimental.set_memory_growth(gpus[0], True)
# print("set memory growth")
except RuntimeError as e:
print(e)
class Optimizer:
"""
particle swarm optimization
PSO 실행을 위한 클래스
"""
def __init__(
self,
model: keras.models,
loss="mse",
n_particles: int = 10,
c0=0.5,
c1=1.5,
w_min=0.5,
w_max=1.5,
negative_swarm: float = 0,
mutation_swarm: float = 0,
np_seed: int = None,
tf_seed: int = None,
particle_min: float = -5,
particle_max: float = 5,
):
"""
particle swarm optimization
Args:
model (keras.models): 모델 구조
loss (str): 손실함수
n_particles (int): 파티클 개수
c0 (float): local rate - 지역 최적값 관성 수치
c1 (float): global rate - 전역 최적값 관성 수치
w_min (float): 최소 관성 수치
w_max (float): 최대 관성 수치
negative_swarm (float): 최적해와 반대로 이동할 파티클 비율 - 0 ~ 1 사이의 값
mutation_swarm (float): 돌연변이가 일어날 확률
np_seed (int, optional): numpy seed. Defaults to None.
tf_seed (int, optional): tensorflow seed. Defaults to None.
"""
if np_seed is not None:
np.random.seed(np_seed)
if tf_seed is not None:
tf.random.set_seed(tf_seed)
self.random_state = np.random.get_state()
self.model = model # 모델 구조
self.loss = loss # 손실함수
self.n_particles = n_particles # 파티클 개수
self.particles = [None] * n_particles # 파티클 리스트
self.c0 = c0 # local rate - 지역 최적값 관성 수치
self.c1 = c1 # global rate - 전역 최적값 관성 수치
self.w_min = w_min # 최소 관성 수치
self.w_max = w_max # 최대 관성 수치
self.negative_swarm = negative_swarm # 최적해와 반대로 이동할 파티클 비율 - 0 ~ 1 사이의 값
self.mutation_swarm = mutation_swarm # 관성을 추가로 사용할 파티클 비율 - 0 ~ 1 사이의 값
self.g_best_score = [0, np.inf] # 최고 점수 - 시작은 0으로 초기화
self.g_best = None # 최고 점수를 받은 가중치
self.g_best_ = None # 최고 점수를 받은 가중치 - 값의 분산을 위한 변수
self.avg_score = 0 # 평균 점수
self.save_path = None # 저장 위치
self.renewal = "acc"
self.Dispersion = False
self.day = datetime.now().strftime("%m-%d-%H-%M")
self.empirical_balance = False
negative_count = 0
for i in tqdm(range(self.n_particles), desc="Initializing Particles"):
m = keras.models.model_from_json(model.to_json())
init_weights = m.get_weights()
w_, sh_, len_ = self._encode(init_weights)
w_ = np.random.uniform(particle_min, particle_max, len(w_))
m.set_weights(self._decode(w_, sh_, len_))
m.compile(loss=self.loss, optimizer="sgd", metrics=["accuracy"])
self.particles[i] = Particle(
m,
loss,
negative=True if i < negative_swarm * self.n_particles else False,
mutation=mutation_swarm,
)
if i < negative_swarm * self.n_particles:
negative_count += 1
print(f"negative swarm : {negative_count} / {self.n_particles}")
print(
f"mutation swarm : {mutation_swarm * self.n_particles} / {self.n_particles}"
)
gc.collect()
def __del__(self):
del self.model
del self.loss
del self.n_particles
del self.particles
del self.c0
del self.c1
del self.w_min
del self.w_max
del self.negative_swarm
del self.g_best_score
del self.g_best
del self.g_best_
del self.avg_score
gc.collect()
def _encode(self, weights):
"""
가중치를 1차원으로 풀어서 반환
Args:
weights (list) : keras model의 가중치
Returns:
(numpy array) : 가중치 - 1차원으로 풀어서 반환
(list) : 가중치의 원본 shape
(list) : 가중치의 원본 shape의 길이
"""
w_gpu = np.array([])
length = []
shape = []
for layer in weights:
shape.append(layer.shape)
w_ = layer.reshape(-1)
length.append(len(w_))
w_gpu = np.append(w_gpu, w_)
del weights
return w_gpu, shape, length
def _decode(self, weight, shape, length):
"""
_encode 로 인코딩된 가중치를 원본 shape으로 복원
파라미터는 encode의 리턴값을 그대로 사용을 권장
Args:
weight (numpy array): 가중치 - 1차원으로 풀어서 반환
shape (list): 가중치의 원본 shape
length (list): 가중치의 원본 shape의 길이
Returns:
(list) : 가중치 원본 shape으로 복원
"""
weights = []
start = 0
for i in range(len(shape)):
end = start + length[i]
w_ = weight[start:end]
w_ = np.reshape(w_, shape[i])
weights.append(w_)
start = end
del weight
del shape
del length
return weights
def f(self, x, y, weights):
"""
EBPSO의 목적함수 (예상)
Args:
x (list): 입력 데이터
y (list): 출력 데이터
weights (list): 가중치
Returns:
(float): 목적 함수 값
"""
self.model.set_weights(weights)
self.model.compile(loss=self.loss, optimizer="sgd", metrics=["accuracy"])
score = self.model.evaluate(x, y, verbose=0)[1]
if score > 0:
return 1 / (1 + score)
else:
return 1 + np.abs(score)
def fit(
self,
x,
y,
epochs: int = 100,
save: bool = False,
save_path: str = "./result",
renewal: str = "acc",
empirical_balance: bool = False,
Dispersion: bool = False,
check_point: int = None,
):
"""
Args:
x_test : numpy array,
y_test : numpy array,
epochs : int,
save : bool - True : save, False : not save
save_path : str ex) "./result",
renewal : str ex) "acc" or "loss" or "both",
empirical_balance : bool - True :
Dispersion : bool - True : g_best 의 값을 분산시켜 전역해를 찾음, False : g_best 의 값만 사용
check_point : int - 저장할 위치 - None : 저장 안함
"""
self.save_path = save_path
self.empirical_balance = empirical_balance
self.Dispersion = Dispersion
self.renewal = renewal
try:
if save:
if save_path is None:
raise ValueError("save_path is None")
else:
self.save_path = save_path
if not os.path.exists(save_path):
os.makedirs(save_path, exist_ok=True)
except ValueError as e:
print(e)
sys.exit(1)
for i in tqdm(range(self.n_particles), desc="Initializing velocity"):
p = self.particles[i]
local_score = p.get_score(x, y, renewal=renewal)
if renewal == "acc":
if local_score[1] > self.g_best_score[0]:
self.g_best_score[0] = local_score[1]
self.g_best = p.get_best_weights()
self.g_best_ = p.get_best_weights()
elif renewal == "loss":
if local_score[0] < self.g_best_score[1]:
self.g_best_score[1] = local_score[0]
self.g_best = p.get_best_weights()
self.g_best_ = p.get_best_weights()
elif renewal == "both":
if local_score[1] > self.g_best_score[0]:
self.g_best_score[0] = local_score[1]
self.g_best_score[1] = local_score[0]
self.g_best = p.get_best_weights()
self.g_best_ = p.get_best_weights()
if local_score[0] == None:
local_score[0] = np.inf
if local_score[1] == None:
local_score[1] = 0
if save:
with open(
f"./{save_path}/{self.day}_{self.n_particles}_{epochs}_{self.c0}_{self.c1}_{self.w_min}_{renewal}.csv",
"a",
) as f:
f.write(f"{local_score[0]}, {local_score[1]}")
if i != self.n_particles - 1:
f.write(", ")
else:
f.write("\n")
del local_score
gc.collect()
print(
f"initial g_best_score : {self.g_best_score[0] if self.renewal == 'acc' else self.g_best_score[1]}"
)
try:
epochs_pbar = tqdm(
range(epochs),
desc=f"best {self.g_best_score[0]:.4f}|{self.g_best_score[1]:.4f}",
ascii=True,
leave=True,
)
for epoch in epochs_pbar:
acc = 0
loss = 0
min_score = np.inf
max_score = 0
min_loss = np.inf
max_loss = 0
ts = self.c0 + np.random.rand() * (self.c1 - self.c0)
part_pbar = tqdm(
range(len(self.particles)),
desc=f"acc : {max_score:.4f} loss : {min_loss:.4f}",
ascii=True,
leave=False,
)
for i in part_pbar:
part_pbar.set_description(
f"acc : {max_score:.4f} loss : {min_loss:.4f}"
)
w = self.w_max - (self.w_max - self.w_min) * epoch / epochs
g_, g_sh, g_len = self._encode(self.g_best)
decrement = (epochs - (epoch) + 1) / epochs
g_ = (1 - decrement) * g_ + decrement * ts
self.g_best_ = self._decode(g_, g_sh, g_len)
if Dispersion:
g_best = self.g_best_
else:
g_best = self.g_best
if empirical_balance:
if np.random.rand() < np.exp(-(epoch) / epochs):
w_p_ = self.f(x, y, self.particles[i].get_best_weights())
w_g_ = self.f(x, y, self.g_best)
w_p = w_p_ / (w_p_ + w_g_)
w_g = w_p_ / (w_p_ + w_g_)
del w_p_
del w_g_
else:
p_b = self.particles[i].get_best_score()
g_a = self.avg_score
l_b = p_b - g_a
l_b = np.sqrt(np.power(l_b, 2))
p_ = (
1
/ (self.n_particles * np.linalg.norm(self.c1 - self.c0))
* l_b
)
p_ = np.exp(-1 * p_)
w_p = p_
w_g = 1 - p_
del p_b
del g_a
del l_b
del p_
score = self.particles[i].step_w(
x, y, self.c0, self.c1, w, g_best, w_p, w_g, renewal=renewal
)
else:
score = self.particles[i].step(
x, y, self.c0, self.c1, w, g_best, renewal=renewal
)
if renewal == "acc":
if score[1] >= self.g_best_score[0]:
if score[1] > self.g_best_score[0]:
self.g_best_score[0] = score[1]
self.g_best = self.particles[i].get_best_weights()
else:
if score[0] < self.g_best_score[1]:
self.g_best_score[1] = score[0]
self.g_best = self.particles[i].get_best_weights()
epochs_pbar.set_description(
f"best {self.g_best_score[0]:.4f} | {self.g_best_score[1]:.4f}"
)
elif renewal == "loss":
if score[0] <= self.g_best_score[1]:
if score[0] < self.g_best_score[1]:
self.g_best_score[1] = score[0]
self.g_best = self.particles[i].get_best_weights()
else:
if score[1] > self.g_best_score[0]:
self.g_best_score[0] = score[1]
self.g_best = self.particles[i].get_best_weights()
epochs_pbar.set_description(
f"best {self.g_best_score[0]:.4f} | {self.g_best_score[1]:.4f}"
)
elif renewal == "both":
if score[1] > self.g_best_score[0]:
self.g_best_score[0] = score[1]
self.g_best = self.particles[i].get_best_weights()
epochs_pbar.set_description(
f"best {self.g_best_score[0]:.4f} | {self.g_best_score[1]:.4f}"
)
if score[0] < self.g_best_score[1]:
self.g_best_score[1] = score[0]
self.g_best = self.particles[i].get_best_weights()
epochs_pbar.set_description(
f"best {self.g_best_score[0]:.4f} | {self.g_best_score[1]:.4f}"
)
if score[0] == None:
score[0] = np.inf
if score[1] == None:
score[1] = 0
loss = loss + score[0]
acc = acc + score[1]
if score[0] < min_loss:
min_loss = score[0]
if score[0] > max_loss:
max_loss = score[0]
if score[1] < min_score:
min_score = score[1]
if score[1] > max_score:
max_score = score[1]
if save:
with open(
f"./{save_path}/{self.day}_{self.n_particles}_{epochs}_{self.c0}_{self.c1}_{self.w_min}_{renewal}.csv",
"a",
) as f:
f.write(f"{score[0]}, {score[1]}")
if i != self.n_particles - 1:
f.write(", ")
else:
f.write("\n")
if check_point is not None:
if epoch % check_point == 0:
os.makedirs(f"./{save_path}/{self.day}", exist_ok=True)
self._check_point_save(f"./{save_path}/{self.day}/ckpt-{epoch}")
self.avg_score = acc / self.n_particles
gc.collect()
except KeyboardInterrupt:
print("Ctrl + C : Stop Training")
except MemoryError:
print("Memory Error : Stop Training")
except Exception as e:
print(e)
finally:
self.model_save(save_path)
print("model save")
self.save_info(save_path)
print("save info")
return self.g_best_score
def get_best_model(self):
"""
최고 점수를 받은 모델을 반환
Returns:
(keras.models): 모델
"""
model = keras.models.model_from_json(self.model.to_json())
model.set_weights(self.g_best)
model.compile(loss=self.loss, optimizer="sgd", metrics=["accuracy"])
return model
def get_best_score(self):
"""
최고 점수를 반환
Returns:
(float): 점수
"""
return self.g_best_score
def get_best_weights(self):
"""
최고 점수를 받은 가중치를 반환
Returns:
(float): 가중치
"""
return self.g_best
def save_info(self, path: str = "./result"):
"""
학습 정보를 저장
Args:
path (str, optional): 저장 위치. Defaults to "./result".
"""
json_save = {
"name": f"{self.day}_{self.n_particles}_{self.c0}_{self.c1}_{self.w_min}.h5",
"n_particles": self.n_particles,
"score": self.g_best_score,
"c0": self.c0,
"c1": self.c1,
"w_min": self.w_min,
"w_max": self.w_max,
"loss_method": self.loss,
"empirical_balance": self.empirical_balance,
"Dispersion": self.Dispersion,
"negative_swarm": self.negative_swarm,
"mutation_swarm": self.mutation_swarm,
"random_state_0": self.random_state[0],
"random_state_1": self.random_state[1].tolist(),
"random_state_2": self.random_state[2],
"random_state_3": self.random_state[3],
"random_state_4": self.random_state[4],
"renewal": self.renewal,
}
with open(
f"./{path}/{self.day}/{self.loss}_{self.g_best_score}.json",
"a",
) as f:
json.dump(json_save, f, indent=4)
def _check_point_save(self, save_path: str = f"./result/check_point"):
"""
중간 저장
Args:
save_path (str, optional): checkpoint 저장 위치 및 이름. Defaults to f"./result/check_point".
"""
model = self.get_best_model()
model.save_weights(save_path)
def model_save(self, save_path: str = "./result"):
"""
최고 점수를 받은 모델 저장
Args:
save_path (str, optional): 모델의 저장 위치. Defaults to "./result".
Returns:
(keras.models): 모델
"""
model = self.get_best_model()
model.save(
f"./{save_path}/{self.day}/{self.n_particles}_{self.c0}_{self.c1}_{self.w_min}.h5"
)
return model

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import gc
import json
import os
import sys
from datetime import datetime
import numpy as np
import tensorflow as tf
from tensorflow import keras
from tqdm import tqdm
from .particle import Particle
gpus = tf.config.experimental.list_physical_devices("GPU")
if gpus:
try:
# tf.config.experimental.set_visible_devices(gpus[0], "GPU")
# print(tf.config.experimental.get_visible_devices("GPU"))
tf.config.experimental.set_memory_growth(gpus[0], True)
# print("set memory growth")
except RuntimeError as e:
print(e)
class Optimizer_Target:
"""
particle swarm optimization
PSO 실행을 위한 클래스
"""
def __init__(
self,
model: keras.models,
loss="mse",
n_particles: int = 10,
c0=0.5,
c1=1.5,
w_min=0.5,
w_max=1.5,
negative_swarm: float = 0,
mutation_swarm: float = 0,
np_seed: int = None,
tf_seed: int = None,
target_weights=None,
):
"""
particle swarm optimization
Args:
model (keras.models): 모델 구조
loss (str): 손실함수
n_particles (int): 파티클 개수
c0 (float): local rate - 지역 최적값 관성 수치
c1 (float): global rate - 전역 최적값 관성 수치
w_min (float): 최소 관성 수치
w_max (float): 최대 관성 수치
negative_swarm (float): 최적해와 반대로 이동할 파티클 비율 - 0 ~ 1 사이의 값
mutation_swarm (float): 돌연변이가 일어날 확률
np_seed (int, optional): numpy seed. Defaults to None.
tf_seed (int, optional): tensorflow seed. Defaults to None.
target_weights (list, optional): 목표 가중치. Defaults to None.
"""
if np_seed is not None:
np.random.seed(np_seed)
if tf_seed is not None:
tf.random.set_seed(tf_seed)
self.model = model # 모델 구조
self.loss = loss # 손실함수
self.n_particles = n_particles # 파티클 개수
self.particles = [None] * n_particles # 파티클 리스트
self.c0 = c0 # local rate - 지역 최적값 관성 수치
self.c1 = c1 # global rate - 전역 최적값 관성 수치
self.w_min = w_min # 최소 관성 수치
self.w_max = w_max # 최대 관성 수치
self.negative_swarm = negative_swarm # 최적해와 반대로 이동할 파티클 비율 - 0 ~ 1 사이의 값
self.mutation_swarm = mutation_swarm # 관성을 추가로 사용할 파티클 비율 - 0 ~ 1 사이의 값
self.g_best_score = [0, np.inf] # 최고 점수 - 시작은 0으로 초기화
self.g_best = None # 최고 점수를 받은 가중치
self.g_best_ = None # 최고 점수를 받은 가중치 - 값의 분산을 위한 변수
self.target_weights = target_weights # 목표 가중치
self.avg_score = 0 # 평균 점수
self.save_path = None # 저장 위치
self.renewal = "acc"
self.Dispersion = False
self.day = datetime.now().strftime("%m-%d-%H-%M")
negative_count = 0
for i in tqdm(range(self.n_particles), desc="Initializing Particles"):
m = keras.models.model_from_json(model.to_json())
init_weights = m.get_weights()
w_, sh_, len_ = self._encode(init_weights)
w_ = np.random.uniform(-1, 2, len(w_))
m.set_weights(self._decode(w_, sh_, len_))
m.compile(loss=self.loss, optimizer="sgd", metrics=["accuracy"])
self.particles[i] = Particle(
m,
loss,
negative=True if i < negative_swarm * self.n_particles else False,
mutation=mutation_swarm,
)
if i < negative_swarm * self.n_particles:
negative_count += 1
print(f"negative swarm : {negative_count} / {self.n_particles}")
print(
f"mutation swarm : {mutation_swarm * self.n_particles} / {self.n_particles}"
)
gc.collect()
def __del__(self):
del self.model
del self.loss
del self.n_particles
del self.particles
del self.c0
del self.c1
del self.w_min
del self.w_max
del self.negative_swarm
del self.g_best_score
del self.g_best
del self.g_best_
del self.avg_score
gc.collect()
def _encode(self, weights):
"""
가중치를 1차원으로 풀어서 반환
Args:
weights (list) : keras model의 가중치
Returns:
(numpy array) : 가중치 - 1차원으로 풀어서 반환
(list) : 가중치의 원본 shape
(list) : 가중치의 원본 shape의 길이
"""
w_gpu = np.array([])
length = []
shape = []
for layer in weights:
shape.append(layer.shape)
w_ = layer.reshape(-1)
length.append(len(w_))
w_gpu = np.append(w_gpu, w_)
del weights
return w_gpu, shape, length
def _decode(self, weight, shape, length):
"""
_encode 로 인코딩된 가중치를 원본 shape으로 복원
파라미터는 encode의 리턴값을 그대로 사용을 권장
Args:
weight (numpy array): 가중치 - 1차원으로 풀어서 반환
shape (list): 가중치의 원본 shape
length (list): 가중치의 원본 shape의 길이
Returns:
(list) : 가중치 원본 shape으로 복원
"""
weights = []
start = 0
for i in range(len(shape)):
end = start + length[i]
w_ = weight[start:end]
w_ = np.reshape(w_, shape[i])
weights.append(w_)
start = end
del weight
del shape
del length
return weights
def f(self, x, y, weights):
"""
EBPSO의 목적함수 (예상)
Args:
x (list): 입력 데이터
y (list): 출력 데이터
weights (list): 가중치
Returns:
(float): 목적 함수 값
"""
self.model.set_weights(weights)
self.model.compile(loss=self.loss, optimizer="sgd", metrics=["accuracy"])
score = self.model.evaluate(x, y, verbose=0)[1]
if score > 0:
return 1 / (1 + score)
else:
return 1 + np.abs(score)
def fit(
self,
x,
y,
epochs: int = 100,
save: bool = False,
save_path: str = "./result",
renewal: str = "acc",
empirical_balance: bool = False,
Dispersion: bool = False,
check_point: int = None,
):
"""
Args:
x_test : numpy array,
y_test : numpy array,
epochs : int,
save : bool - True : save, False : not save
save_path : str ex) "./result",
renewal : str ex) "acc" or "loss" or "both",
empirical_balance : bool - True :
Dispersion : bool - True : g_best 의 값을 분산시켜 전역해를 찾음, False : g_best 의 값만 사용
check_point : int - 저장할 위치 - None : 저장 안함
"""
self.save_path = save_path
self.empirical_balance = empirical_balance
self.Dispersion = Dispersion
self.renewal = renewal
try:
if save:
if save_path is None:
raise ValueError("save_path is None")
else:
self.save_path = save_path
if not os.path.exists(save_path):
os.makedirs(save_path, exist_ok=True)
except ValueError as e:
print(e)
sys.exit(1)
for i in tqdm(range(self.n_particles), desc="Initializing velocity"):
p = self.particles[i]
local_score = p.get_score(x, y, renewal=renewal)
if renewal == "acc":
if local_score[1] > self.g_best_score[0]:
self.g_best_score[0] = local_score[1]
self.g_best = p.get_best_weights()
self.g_best_ = p.get_best_weights()
elif renewal == "loss":
if local_score[0] < self.g_best_score[1]:
self.g_best_score[1] = local_score[0]
self.g_best = p.get_best_weights()
self.g_best_ = p.get_best_weights()
if local_score[0] == None:
local_score[0] = np.inf
if local_score[1] == None:
local_score[1] = 0
if save:
with open(
f"./{save_path}/{self.day}_{self.n_particles}_{epochs}_{self.c0}_{self.c1}_{self.w_min}_{renewal}.csv",
"a",
) as f:
f.write(f"{local_score[0]}, {local_score[1]}")
if i != self.n_particles - 1:
f.write(", ")
else:
f.write("\n")
f.close()
del local_score
gc.collect()
print(
f"initial g_best_score : {self.g_best_score[0] if self.renewal == 'acc' else self.g_best_score[1]}"
)
try:
epochs_pbar = tqdm(
range(epochs),
desc=f"best {self.g_best_score[0]:.4f}|{self.g_best_score[1]:.4f}",
ascii=True,
leave=True,
)
for epoch in epochs_pbar:
acc = 0
loss = 0
min_score = np.inf
max_score = 0
min_loss = np.inf
max_loss = 0
ts = self.c0 + np.random.rand() * (self.c1 - self.c0)
part_pbar = tqdm(
range(len(self.particles)),
desc=f"acc : {max_score:.4f} loss : {min_loss:.4f}",
ascii=True,
leave=False,
)
for i in part_pbar:
part_pbar.set_description(
f"acc : {max_score:.4f} loss : {min_loss:.4f}"
)
w = self.w_max - (self.w_max - self.w_min) * epoch / epochs
g_, g_sh, g_len = self._encode(self.g_best)
decrement = (epochs - (epoch) + 1) / epochs
g_ = (1 - decrement) * g_ + decrement * ts
self.g_best_ = self._decode(g_, g_sh, g_len)
self.g_best = self.target_weights.get_weights()
if Dispersion:
g_best = self.g_best_
else:
g_best = self.g_best
if empirical_balance:
if np.random.rand() < np.exp(-(epoch) / epochs):
w_p_ = self.f(x, y, self.particles[i].get_best_weights())
w_g_ = self.f(x, y, self.g_best)
w_p = w_p_ / (w_p_ + w_g_)
w_g = w_p_ / (w_p_ + w_g_)
del w_p_
del w_g_
else:
p_b = self.particles[i].get_best_score()
g_a = self.avg_score
l_b = p_b - g_a
l_b = np.sqrt(np.power(l_b, 2))
p_ = (
1
/ (self.n_particles * np.linalg.norm(self.c1 - self.c0))
* l_b
)
p_ = np.exp(-1 * p_)
w_p = p_
w_g = 1 - p_
del p_b
del g_a
del l_b
del p_
score = self.particles[i].step_w(
x, y, self.c0, self.c1, w, g_best, w_p, w_g, renewal=renewal
)
else:
score = self.particles[i].step(
x, y, self.c0, self.c1, w, g_best, renewal=renewal
)
if renewal == "acc":
if score[1] >= self.g_best_score[0]:
if score[1] > self.g_best_score[0]:
self.g_best_score[0] = score[1]
self.g_best = self.particles[i].get_best_weights()
else:
if score[0] < self.g_best_score[1]:
self.g_best_score[1] = score[0]
self.g_best = self.particles[i].get_best_weights()
epochs_pbar.set_description(
f"best {self.g_best_score[0]:.4f} | {self.g_best_score[1]:.4f}"
)
elif renewal == "loss":
if score[0] <= self.g_best_score[1]:
if score[0] < self.g_best_score[1]:
self.g_best_score[1] = score[0]
self.g_best = self.particles[i].get_best_weights()
else:
if score[1] > self.g_best_score[0]:
self.g_best_score[0] = score[1]
self.g_best = self.particles[i].get_best_weights()
epochs_pbar.set_description(
f"best {self.g_best_score[0]:.4f} | {self.g_best_score[1]:.4f}"
)
if score[0] == None:
score[0] = np.inf
if score[1] == None:
score[1] = 0
loss = loss + score[0]
acc = acc + score[1]
if score[0] < min_loss:
min_loss = score[0]
if score[0] > max_loss:
max_loss = score[0]
if score[1] < min_score:
min_score = score[1]
if score[1] > max_score:
max_score = score[1]
if save:
with open(
f"./{save_path}/{self.day}_{self.n_particles}_{epochs}_{self.c0}_{self.c1}_{self.w_min}_{renewal}.csv",
"a",
) as f:
f.write(f"{score[0]}, {score[1]}")
if i != self.n_particles - 1:
f.write(", ")
else:
f.write("\n")
f.close()
if check_point is not None:
if epoch % check_point == 0:
os.makedirs(f"./{save_path}/{self.day}", exist_ok=True)
self._check_point_save(f"./{save_path}/{self.day}/ckpt-{epoch}")
self.avg_score = acc / self.n_particles
gc.collect()
except KeyboardInterrupt:
print("Ctrl + C : Stop Training")
except MemoryError:
print("Memory Error : Stop Training")
except Exception as e:
print(e)
finally:
self.model_save(save_path)
print("model save")
self.save_info(save_path)
print("save info")
return self.g_best_score
def get_best_model(self):
"""
최고 점수를 받은 모델을 반환
Returns:
(keras.models): 모델
"""
model = keras.models.model_from_json(self.model.to_json())
model.set_weights(self.g_best)
model.compile(loss=self.loss, optimizer="sgd", metrics=["accuracy"])
return model
def get_best_score(self):
"""
최고 점수를 반환
Returns:
(float): 점수
"""
return self.g_best_score
def get_best_weights(self):
"""
최고 점수를 받은 가중치를 반환
Returns:
(float): 가중치
"""
return self.g_best
def save_info(self, path: str = "./result"):
"""
학습 정보를 저장
Args:
path (str, optional): 저장 위치. Defaults to "./result".
"""
json_save = {
"name": f"{self.day}_{self.n_particles}_{self.c0}_{self.c1}_{self.w_min}.h5",
"n_particles": self.n_particles,
"score": self.g_best_score,
"c0": self.c0,
"c1": self.c1,
"w_min": self.w_min,
"w_max": self.w_max,
"loss_method": self.loss,
"empirical_balance": self.empirical_balance,
"Dispersion": self.Dispersion,
"negative_swarm": self.negative_swarm,
"mutation_swarm": self.mutation_swarm,
"renewal": self.renewal,
}
with open(
f"./{path}/{self.day}/{self.loss}_{self.g_best_score}.json",
"a",
) as f:
json.dump(json_save, f, indent=4)
f.close()
def _check_point_save(self, save_path: str = f"./result/check_point"):
"""
중간 저장
Args:
save_path (str, optional): checkpoint 저장 위치 및 이름. Defaults to f"./result/check_point".
"""
model = self.get_best_model()
model.save_weights(save_path)
def model_save(self, save_path: str = "./result"):
"""
최고 점수를 받은 모델 저장
Args:
save_path (str, optional): 모델의 저장 위치. Defaults to "./result".
Returns:
(keras.models): 모델
"""
model = self.get_best_model()
model.save(
f"./{save_path}/{self.day}/{self.n_particles}_{self.c0}_{self.c1}_{self.w_min}.h5"
)
return model

307
build/lib/pso/particle.py Normal file
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@@ -0,0 +1,307 @@
import gc
import numpy as np
from tensorflow import keras
class Particle:
"""
Particle Swarm Optimization의 Particle을 구현한 클래스
한 파티클의 life cycle은 다음과 같다.
1. 초기화
2. 손실 함수 계산
3. 속도 업데이트
4. 가중치 업데이트
5. 2번으로 돌아가서 반복
"""
def __init__(
self, model: keras.models, loss, negative: bool = False, mutation: float = 0
):
"""
Args:
model (keras.models): 학습 및 검증을 위한 모델
loss (str|): 손실 함수
negative (bool, optional): 음의 가중치 사용 여부 - 전역 탐색 용도(조기 수렴 방지). Defaults to False.
"""
self.model = model
self.loss = loss
init_weights = self.model.get_weights()
i_w_, s_, l_ = self._encode(init_weights)
i_w_ = np.random.uniform(-0.5, 0.5, len(i_w_))
self.velocities = self._decode(i_w_, s_, l_)
self.negative = negative
self.mutation = mutation
self.best_score = 0
self.best_weights = init_weights
del i_w_, s_, l_
del init_weights
gc.collect()
def __del__(self):
del self.model
del self.loss
del self.velocities
del self.negative
del self.best_score
del self.best_weights
gc.collect()
def _encode(self, weights: list):
"""
가중치를 1차원으로 풀어서 반환
Args:
weights (list) : keras model의 가중치
Returns:
(numpy array) : 가중치 - 1차원으로 풀어서 반환
(list) : 가중치의 원본 shape
(list) : 가중치의 원본 shape의 길이
"""
w_gpu = np.array([])
length = []
shape = []
for layer in weights:
shape.append(layer.shape)
w_ = layer.reshape(-1)
length.append(len(w_))
w_gpu = np.append(w_gpu, w_)
return w_gpu, shape, length
def _decode(self, weight: list, shape, length):
"""
_encode 로 인코딩된 가중치를 원본 shape으로 복원
파라미터는 encode의 리턴값을 그대로 사용을 권장
Args:
weight (numpy array): 가중치 - 1차원으로 풀어서 반환
shape (list): 가중치의 원본 shape
length (list): 가중치의 원본 shape의 길이
Returns:
(list) : 가중치 원본 shape으로 복원
"""
weights = []
start = 0
for i in range(len(shape)):
end = start + length[i]
w_ = weight[start:end]
w_ = np.reshape(w_, shape[i])
weights.append(w_)
start = end
del start, end, w_
del shape, length
del weight
return weights
def get_score(self, x, y, renewal: str = "acc"):
"""
모델의 성능을 평가하여 점수를 반환
Args:
x (list): 입력 데이터
y (list): 출력 데이터
renewal (str, optional): 점수 갱신 방식. Defaults to "acc" | "acc" or "loss".
Returns:
(float): 점수
"""
self.model.compile(loss=self.loss, optimizer="sgd", metrics=["accuracy"])
score = self.model.evaluate(x, y, verbose=0)
if renewal == "acc":
if score[1] > self.best_score:
self.best_score = score[1]
self.best_weights = self.model.get_weights()
elif renewal == "loss":
if score[0] == "nan":
score[0] = np.inf
if score[0] < self.best_score:
self.best_score = score[0]
self.best_weights = self.model.get_weights()
return score
def _update_velocity(self, local_rate, global_rate, w, g_best):
"""
현재 속도 업데이트
Args:
local_rate (float): 지역 최적해의 영향력
global_rate (float): 전역 최적해의 영향력
w (float): 현재 속도의 영향력 - 관성 | 0.9 ~ 0.4 이 적당
g_best (list): 전역 최적해
"""
encode_w, w_sh, w_len = self._encode(weights=self.model.get_weights())
encode_v, v_sh, v_len = self._encode(weights=self.velocities)
encode_p, p_sh, p_len = self._encode(weights=self.best_weights)
encode_g, g_sh, g_len = self._encode(weights=g_best)
r0 = np.random.rand()
r1 = np.random.rand()
if self.negative:
new_v = (
w * encode_v
+ -1 * local_rate * r0 * (encode_p - encode_w)
+ -1 * global_rate * r1 * (encode_g - encode_w)
)
else:
new_v = (
w * encode_v
+ local_rate * r0 * (encode_p - encode_w)
+ global_rate * r1 * (encode_g - encode_w)
)
if np.random.rand() < self.mutation:
m_v = np.random.uniform(-0.1, 0.1, len(encode_v))
new_v = m_v
self.velocities = self._decode(new_v, w_sh, w_len)
del encode_w, w_sh, w_len
del encode_v, v_sh, v_len
del encode_p, p_sh, p_len
del encode_g, g_sh, g_len
del r0, r1
def _update_velocity_w(self, local_rate, global_rate, w, w_p, w_g, g_best):
"""
현재 속도 업데이트
기본 업데이트의 변형으로 지역 최적해와 전역 최적해를 분산시켜 조기 수렴을 방지
Args:
local_rate (float): 지역 최적해의 영향력
global_rate (float): 전역 최적해의 영향력
w (float): 현재 속도의 영향력 - 관성 | 0.9 ~ 0.4 이 적당
w_p (float): 지역 최적해의 분산 정도
w_g (float): 전역 최적해의 분산 정도
g_best (list): 전역 최적해
"""
encode_w, w_sh, w_len = self._encode(weights=self.model.get_weights())
encode_v, v_sh, v_len = self._encode(weights=self.velocities)
encode_p, p_sh, p_len = self._encode(weights=self.best_weights)
encode_g, g_sh, g_len = self._encode(weights=g_best)
r0 = np.random.rand()
r1 = np.random.rand()
if self.negative:
new_v = (
w * encode_v
+ -1 * local_rate * r0 * (w_p * encode_p - encode_w)
+ -1 * global_rate * r1 * (w_g * encode_g - encode_w)
)
else:
new_v = (
w * encode_v
+ local_rate * r0 * (w_p * encode_p - encode_w)
+ global_rate * r1 * (w_g * encode_g - encode_w)
)
if np.random.rand() < self.mutation:
m_v = np.random.uniform(-0.1, 0.1, len(encode_v))
new_v = m_v
self.velocities = self._decode(new_v, w_sh, w_len)
del encode_w, w_sh, w_len
del encode_v, v_sh, v_len
del encode_p, p_sh, p_len
del encode_g, g_sh, g_len
del r0, r1
def _update_weights(self):
"""
가중치 업데이트
"""
encode_w, w_sh, w_len = self._encode(weights=self.model.get_weights())
encode_v, v_sh, v_len = self._encode(weights=self.velocities)
new_w = encode_w + encode_v
self.model.set_weights(self._decode(new_w, w_sh, w_len))
del encode_w, w_sh, w_len
del encode_v, v_sh, v_len
def f(self, x, y, weights):
"""
EBPSO의 목적함수(예상)
Args:
x (list): 입력 데이터
y (list): 출력 데이터
weights (list): 가중치
Returns:
float: 목적함수 값
"""
self.model.set_weights(weights)
score = self.model.evaluate(x, y, verbose=0)[1]
if score > 0:
return 1 / (1 + score)
else:
return 1 + np.abs(score)
def step(self, x, y, local_rate, global_rate, w, g_best, renewal: str = "acc"):
"""
파티클의 한 스텝을 진행합니다.
Args:
x (list): 입력 데이터
y (list): 출력 데이터
local_rate (float): 지역최적해의 영향력
global_rate (float): 전역최적해의 영향력
w (float): 관성
g_best (list): 전역최적해
renewal (str, optional): 최고점수 갱신 방식. Defaults to "acc" | "acc" or "loss"
Returns:
list: 현재 파티클의 점수
"""
self._update_velocity(local_rate, global_rate, w, g_best)
self._update_weights()
return self.get_score(x, y, renewal)
def step_w(
self, x, y, local_rate, global_rate, w, g_best, w_p, w_g, renewal: str = "acc"
):
"""
파티클의 한 스텝을 진행합니다.
기본 스텝의 변형으로, 지역최적해와 전역최적해의 분산 정도를 조정할 수 있습니다
Args:
x (list): 입력 데이터
y (list): 출력 데이터
local_rate (float): 지역 최적해의 영향력
global_rate (float): 전역 최적해의 영향력
w (float): 관성
g_best (list): 전역 최적해
w_p (float): 지역 최적해의 분산 정도
w_g (float): 전역 최적해의 분산 정도
renewal (str, optional): 최고점수 갱신 방식. Defaults to "acc" | "acc" or "loss"
Returns:
float: 현재 파티클의 점수
"""
self._update_velocity_w(local_rate, global_rate, w, w_p, w_g, g_best)
self._update_weights()
return self.get_score(x, y, renewal)
def get_best_score(self):
"""
파티클의 최고점수를 반환합니다.
Returns:
float: 최고점수
"""
return self.best_score
def get_best_weights(self):
"""
파티클의 최고점수를 받은 가중치를 반환합니다
Returns:
list: 가중치 리스트
"""
return self.best_weights