Введение:
Я пытаюсь заставить CDCGAN (условно-глубокую сверточную порождающую состязательную сеть) работать с набором данных MNIST, что должно быть довольно легко, учитывая, что библиотека (PyTorch) Я использую, есть учебник на своем веб-сайте.
Но я не могу заставить его работать. Он просто производит мусор, или модель рушится, или и то, и другое.
Что я пробовал:
- создание модели Условное обучение под наблюдением
- с использованием нормы партии
- с использованием выпадения на каждом слое, кроме слоя ввода / вывода в генераторе и дискриминаторе
- сглаживание меток для борьбы с неуверенностью в себе
- Добавление шума к изображениям (я полагаю, вы называете этот экземпляр шумом) для лучшего распределения данных
- Используйте неплотное реле, чтобы избежать исчезающих градиентов
- Использование буфера воспроизведения для борьбы с забвением изученного материала и переоснащением
- игра с гиперпараметрами
- сравнение это к модели из учебника PyTorch
- В основном то, что я сделал, кроме некоторых вещей, таких как Embedding layer и т. д.
Изображения, сгенерированные моей моделью:
Гиперпараметры:
batch_size = 50, learning_rate_discrimiantor = 0,0001, learning_rate_generator = 0,0003, shuffle = True, ndf = 64, ngf = 64, droupout = 0,5
batch_size = 50, learning_rate_discriminator = 0,0003, learning_rate_generator = 0,0003, shuffle = True, ndf = 64, ngf = 64, отсев = 0
Изображения Обучающая программа Pytorch Модель сгенерировано:
Код для учебника Pytorch dcgan модель
Для сравнения здесь приведены изображения из DCGAN из туториала pytorch:
Мой код:
import torch
import torch.nn as nn
import torchvision
from torchvision import transforms, datasets
import torch.nn.functional as F
from torch import optim as optim
from torch.utils.tensorboard import SummaryWriter
import numpy as np
import os
import time
class Discriminator(torch.nn.Module):
def __init__(self, ndf=16, dropout_value=0.5): # ndf feature map discriminator
super().__init__()
self.ndf = ndf
self.droupout_value = dropout_value
self.condi = nn.Sequential(
nn.Linear(in_features=10, out_features=64 * 64)
)
self.hidden0 = nn.Sequential(
nn.Conv2d(in_channels=2, out_channels=self.ndf, kernel_size=4, stride=2, padding=1, bias=False),
nn.LeakyReLU(0.2),
)
self.hidden1 = nn.Sequential(
nn.Conv2d(in_channels=self.ndf, out_channels=self.ndf * 2, kernel_size=4, stride=2, padding=1, bias=False),
nn.BatchNorm2d(self.ndf * 2),
nn.LeakyReLU(0.2),
nn.Dropout(self.droupout_value)
)
self.hidden2 = nn.Sequential(
nn.Conv2d(in_channels=self.ndf * 2, out_channels=self.ndf * 4, kernel_size=4, stride=2, padding=1, bias=False),
#nn.BatchNorm2d(self.ndf * 4),
nn.LeakyReLU(0.2),
nn.Dropout(self.droupout_value)
)
self.hidden3 = nn.Sequential(
nn.Conv2d(in_channels=self.ndf * 4, out_channels=self.ndf * 8, kernel_size=4, stride=2, padding=1, bias=False),
nn.BatchNorm2d(self.ndf * 8),
nn.LeakyReLU(0.2),
nn.Dropout(self.droupout_value)
)
self.out = nn.Sequential(
nn.Conv2d(in_channels=self.ndf * 8, out_channels=1, kernel_size=4, stride=1, padding=0, bias=False),
torch.nn.Sigmoid()
)
def forward(self, x, y):
y = self.condi(y.view(-1, 10))
y = y.view(-1, 1, 64, 64)
x = torch.cat((x, y), dim=1)
x = self.hidden0(x)
x = self.hidden1(x)
x = self.hidden2(x)
x = self.hidden3(x)
x = self.out(x)
return x
class Generator(torch.nn.Module):
def __init__(self, n_features=100, ngf=16, c_channels=1, dropout_value=0.5): # ngf feature map of generator
super().__init__()
self.ngf = ngf
self.n_features = n_features
self.c_channels = c_channels
self.droupout_value = dropout_value
self.hidden0 = nn.Sequential(
nn.ConvTranspose2d(in_channels=self.n_features + 10, out_channels=self.ngf * 8,
kernel_size=4, stride=1, padding=0, bias=False),
nn.BatchNorm2d(self.ngf * 8),
nn.LeakyReLU(0.2)
)
self.hidden1 = nn.Sequential(
nn.ConvTranspose2d(in_channels=self.ngf * 8, out_channels=self.ngf * 4,
kernel_size=4, stride=2, padding=1, bias=False),
#nn.BatchNorm2d(self.ngf * 4),
nn.LeakyReLU(0.2),
nn.Dropout(self.droupout_value)
)
self.hidden2 = nn.Sequential(
nn.ConvTranspose2d(in_channels=self.ngf * 4, out_channels=self.ngf * 2,
kernel_size=4, stride=2, padding=1, bias=False),
nn.BatchNorm2d(self.ngf * 2),
nn.LeakyReLU(0.2),
nn.Dropout(self.droupout_value)
)
self.hidden3 = nn.Sequential(
nn.ConvTranspose2d(in_channels=self.ngf * 2, out_channels=self.ngf,
kernel_size=4, stride=2, padding=1, bias=False),
nn.BatchNorm2d(self.ngf),
nn.LeakyReLU(0.2),
nn.Dropout(self.droupout_value)
)
self.out = nn.Sequential(
# "out_channels=1" because gray scale
nn.ConvTranspose2d(in_channels=self.ngf, out_channels=1, kernel_size=4,
stride=2, padding=1, bias=False),
nn.Tanh()
)
def forward(self, x, y):
x_cond = torch.cat((x, y), dim=1) # Combine flatten image with conditional input (class labels)
x = self.hidden0(x_cond) # Image goes into a "ConvTranspose2d" layer
x = self.hidden1(x)
x = self.hidden2(x)
x = self.hidden3(x)
x = self.out(x)
return x
class Logger:
def __init__(self, model_name, model1, model2, m1_optimizer, m2_optimizer, model_parameter, train_loader):
self.out_dir = "data"
self.model_name = model_name
self.train_loader = train_loader
self.model1 = model1
self.model2 = model2
self.model_parameter = model_parameter
self.m1_optimizer = m1_optimizer
self.m2_optimizer = m2_optimizer
# Exclude Epochs of the model name. This make sense e.g. when we stop a training progress and continue later on.
self.experiment_name = '_'.join("{!s}={!r}".format(k, v) for (k, v) in model_parameter.items())\
.replace("Epochs" + "=" + str(model_parameter["Epochs"]), "")
self.d_error = 0
self.g_error = 0
self.tb = SummaryWriter(log_dir=str(self.out_dir + "/log/" + self.model_name + "/runs/" + self.experiment_name))
self.path_image = os.path.join(os.getcwd(), f'{self.out_dir}/log/{self.model_name}/images/{self.experiment_name}')
self.path_model = os.path.join(os.getcwd(), f'{self.out_dir}/log/{self.model_name}/model/{self.experiment_name}')
try:
os.makedirs(self.path_image)
except Exception as e:
print("WARNING: ", str(e))
try:
os.makedirs(self.path_model)
except Exception as e:
print("WARNING: ", str(e))
def log_graph(self, model1_input, model2_input, model1_label, model2_label):
self.tb.add_graph(self.model1, input_to_model=(model1_input, model1_label))
self.tb.add_graph(self.model2, input_to_model=(model2_input, model2_label))
def log(self, num_epoch, d_error, g_error):
self.d_error = d_error
self.g_error = g_error
self.tb.add_scalar("Discriminator Train Error", self.d_error, num_epoch)
self.tb.add_scalar("Generator Train Error", self.g_error, num_epoch)
def log_image(self, images, epoch, batch_num):
grid = torchvision.utils.make_grid(images)
torchvision.utils.save_image(grid, f'{self.path_image}\\Epoch_{epoch}_batch_{batch_num}.png')
self.tb.add_image("Generator Image", grid)
def log_histogramm(self):
for name, param in self.model2.named_parameters():
self.tb.add_histogram(name, param, self.model_parameter["Epochs"])
self.tb.add_histogram(f'gen_{name}.grad', param.grad, self.model_parameter["Epochs"])
for name, param in self.model1.named_parameters():
self.tb.add_histogram(name, param, self.model_parameter["Epochs"])
self.tb.add_histogram(f'dis_{name}.grad', param.grad, self.model_parameter["Epochs"])
def log_model(self, num_epoch):
torch.save({
"epoch": num_epoch,
"model_generator_state_dict": self.model1.state_dict(),
"model_discriminator_state_dict": self.model2.state_dict(),
"optimizer_generator_state_dict": self.m1_optimizer.state_dict(),
"optimizer_discriminator_state_dict": self.m2_optimizer.state_dict(),
}, str(self.path_model + f'\\{time.time()}_epoch{num_epoch}.pth'))
def close(self, logger, images, num_epoch, d_error, g_error):
logger.log_model(num_epoch)
logger.log_histogramm()
logger.log(num_epoch, d_error, g_error)
self.tb.close()
def display_stats(self, epoch, batch_num, dis_error, gen_error):
print(f'Epoch: [{epoch}/{self.model_parameter["Epochs"]}] '
f'Batch: [{batch_num}/{len(self.train_loader)}] '
f'Loss_D: {dis_error.data.cpu()}, '
f'Loss_G: {gen_error.data.cpu()}')
def get_MNIST_dataset(num_workers_loader, model_parameter, out_dir="data"):
compose = transforms.Compose([
transforms.Resize((64, 64)),
transforms.CenterCrop((64, 64)),
transforms.ToTensor(),
torchvision.transforms.Normalize(mean=[0.5], std=[0.5])
])
dataset = datasets.MNIST(
root=out_dir,
train=True,
download=True,
transform=compose
)
train_loader = torch.utils.data.DataLoader(dataset,
batch_size=model_parameter["batch_size"],
num_workers=num_workers_loader,
shuffle=model_parameter["shuffle"])
return dataset, train_loader
def train_discriminator(p_optimizer, p_noise, p_images, p_fake_target, p_real_target, p_images_labels, p_fake_labels, device):
p_optimizer.zero_grad()
# 1.1 Train on real data
pred_dis_real = discriminator(p_images, p_images_labels)
error_real = loss(pred_dis_real, p_real_target)
error_real.backward()
# 1.2 Train on fake data
fake_data = generator(p_noise, p_fake_labels).detach()
fake_data = add_noise_to_image(fake_data, device)
pred_dis_fake = discriminator(fake_data, p_fake_labels)
error_fake = loss(pred_dis_fake, p_fake_target)
error_fake.backward()
p_optimizer.step()
return error_fake + error_real
def train_generator(p_optimizer, p_noise, p_real_target, p_fake_labels, device):
p_optimizer.zero_grad()
fake_images = generator(p_noise, p_fake_labels)
fake_images = add_noise_to_image(fake_images, device)
pred_dis_fake = discriminator(fake_images, p_fake_labels)
error_fake = loss(pred_dis_fake, p_real_target) # because
"""
We use "p_real_target" instead of "p_fake_target" because we want to
maximize that the discriminator is wrong.
"""
error_fake.backward()
p_optimizer.step()
return fake_images, pred_dis_fake, error_fake
# TODO change to a Truncated normal distribution
def get_noise(batch_size, n_features=100):
return torch.FloatTensor(batch_size, n_features, 1, 1).uniform_(-1, 1)
# We flip label of real and fate data. Better gradient flow I have told
def get_real_data_target(batch_size):
return torch.FloatTensor(batch_size, 1, 1, 1).uniform_(0.0, 0.2)
def get_fake_data_target(batch_size):
return torch.FloatTensor(batch_size, 1, 1, 1).uniform_(0.8, 1.1)
def image_to_vector(images):
return torch.flatten(images, start_dim=1, end_dim=-1)
def vector_to_image(images):
return images.view(images.size(0), 1, 28, 28)
def get_rand_labels(batch_size):
return torch.randint(low=0, high=9, size=(batch_size,))
def load_model(model_load_path):
if model_load_path:
checkpoint = torch.load(model_load_path)
discriminator.load_state_dict(checkpoint["model_discriminator_state_dict"])
generator.load_state_dict(checkpoint["model_generator_state_dict"])
dis_opti.load_state_dict(checkpoint["optimizer_discriminator_state_dict"])
gen_opti.load_state_dict(checkpoint["optimizer_generator_state_dict"])
return checkpoint["epoch"]
else:
return 0
def init_model_optimizer(model_parameter, device):
# Initialize the Models
discriminator = Discriminator(ndf=model_parameter["ndf"], dropout_value=model_parameter["dropout"]).to(device)
generator = Generator(ngf=model_parameter["ngf"], dropout_value=model_parameter["dropout"]).to(device)
# train
dis_opti = optim.Adam(discriminator.parameters(), lr=model_parameter["learning_rate_dis"], betas=(0.5, 0.999))
gen_opti = optim.Adam(generator.parameters(), lr=model_parameter["learning_rate_gen"], betas=(0.5, 0.999))
return discriminator, generator, dis_opti, gen_opti
def get_hot_vector_encode(labels, device):
return torch.eye(10)[labels].view(-1, 10, 1, 1).to(device)
def add_noise_to_image(images, device, level_of_noise=0.1):
return images[0].to(device) + (level_of_noise) * torch.randn(images.shape).to(device)
if __name__ == "__main__":
# Hyperparameter
model_parameter = {
"batch_size": 500,
"learning_rate_dis": 0.0002,
"learning_rate_gen": 0.0002,
"shuffle": False,
"Epochs": 10,
"ndf": 64,
"ngf": 64,
"dropout": 0.5
}
# Parameter
r_frequent = 10 # How many samples we save for replay per batch (batch_size / r_frequent).
model_name = "CDCGAN" # The name of you model e.g. "Gan"
num_workers_loader = 1 # How many workers should load the data
sample_save_size = 16 # How many numbers your saved imaged should show
device = "cuda" # Which device should be used to train the neural network
model_load_path = "" # If set load model instead of training from new
num_epoch_log = 1 # How frequent you want to log/
torch.manual_seed(43) # Sets a seed for torch for reproducibility
dataset_train, train_loader = get_MNIST_dataset(num_workers_loader, model_parameter) # Get dataset
# Initialize the Models and optimizer
discriminator, generator, dis_opti, gen_opti = init_model_optimizer(model_parameter, device) # Init model/Optimizer
start_epoch = load_model(model_load_path) # when we want to load a model
# Init Logger
logger = Logger(model_name, generator, discriminator, gen_opti, dis_opti, model_parameter, train_loader)
loss = nn.BCELoss()
images, labels = next(iter(train_loader)) # For logging
# For testing
# pred = generator(get_noise(model_parameter["batch_size"]).to(device), get_hot_vector_encode(get_rand_labels(model_parameter["batch_size"]), device))
# dis = discriminator(images.to(device), get_hot_vector_encode(labels, device))
logger.log_graph(get_noise(model_parameter["batch_size"]).to(device), images.to(device),
get_hot_vector_encode(get_rand_labels(model_parameter["batch_size"]), device),
get_hot_vector_encode(labels, device))
# Array to store
exp_replay = torch.tensor([]).to(device)
for num_epoch in range(start_epoch, model_parameter["Epochs"]):
for batch_num, data_loader in enumerate(train_loader):
images, labels = data_loader
images = add_noise_to_image(images, device) # Add noise to the images
# 1. Train Discriminator
dis_error = train_discriminator(
dis_opti,
get_noise(model_parameter["batch_size"]).to(device),
images.to(device),
get_fake_data_target(model_parameter["batch_size"]).to(device),
get_real_data_target(model_parameter["batch_size"]).to(device),
get_hot_vector_encode(labels, device),
get_hot_vector_encode(
get_rand_labels(model_parameter["batch_size"]), device),
device
)
# 2. Train Generator
fake_image, pred_dis_fake, gen_error = train_generator(
gen_opti,
get_noise(model_parameter["batch_size"]).to(device),
get_real_data_target(model_parameter["batch_size"]).to(device),
get_hot_vector_encode(
get_rand_labels(model_parameter["batch_size"]),
device),
device
)
# Store a random point for experience replay
perm = torch.randperm(fake_image.size(0))
r_idx = perm[:max(1, int(model_parameter["batch_size"] / r_frequent))]
r_samples = add_noise_to_image(fake_image[r_idx], device)
exp_replay = torch.cat((exp_replay, r_samples), 0).detach()
if exp_replay.size(0) >= model_parameter["batch_size"]:
# Train on experienced data
dis_opti.zero_grad()
r_label = get_hot_vector_encode(torch.zeros(exp_replay.size(0)).numpy(), device)
pred_dis_real = discriminator(exp_replay, r_label)
error_real = loss(pred_dis_real, get_fake_data_target(exp_replay.size(0)).to(device))
error_real.backward()
dis_opti.step()
print(f'Epoch: [{num_epoch}/{model_parameter["Epochs"]}] '
f'Batch: Replay/Experience batch '
f'Loss_D: {error_real.data.cpu()}, '
)
exp_replay = torch.tensor([]).to(device)
logger.display_stats(epoch=num_epoch, batch_num=batch_num, dis_error=dis_error, gen_error=gen_error)
if batch_num % 100 == 0:
logger.log_image(fake_image[:sample_save_size], num_epoch, batch_num)
logger.log(num_epoch, dis_error, gen_error)
if num_epoch % num_epoch_log == 0:
logger.log_model(num_epoch)
logger.log_histogramm()
logger.close(logger, fake_image[:sample_save_size], num_epoch, dis_error, gen_error)
Первая ссылка на мой код (Pastebin)
Вторая ссылка на мой код (0bin)
Вывод: * 10 86 *
Поскольку я реализовал все эти вещи (например, сглаживание меток), которые считаются полезными для GAN / DCGAN.
И моя модель по-прежнему работает хуже, чем учебник DCGAN от PyTorch, я думаю, что у меня может быть ошибка в моем коде, но я не могу ее найти.
Воспроизводимость:
Вы можете просто скопировать код и запустить его, если у вас есть библиотеки, которые я импортировал, установили, чтобы посмотреть на себя, если сможете найти что-нибудь.
Я ценю любые отзывы.