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train.py
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train.py
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# coding: UTF-8
"""
@author: samuel ko
@readme: StyleGAN2 PyTorch
"""
import torchvision_sunner.transforms as sunnertransforms
import torchvision_sunner.data as sunnerData
import torchvision.transforms as transforms
from torch.autograd import grad
from network.stylegan2 import G_stylegan2, D_stylegan2
from utils.utils import plotLossCurve, copy_G_params, load_params
from loss.loss import D_logistic_r1, D_logistic_r2, G_logistic_ns_pathreg
from opts.opts import TrainOptions, INFO
from torchvision.utils import save_image
from tqdm import tqdm
from matplotlib import pyplot as plt
import torch.optim as optim
import numpy as np
import random
import torch
import os
# Set random seem for reproducibility
# manualSeed = 999
#manualSeed = random.randint(1, 10000) # use if you want new results
# print("Random Seed: ", manualSeed)
# random.seed(manualSeed)
# torch.manual_seed(manualSeed)
# Hyper-parameters
CRITIC_ITER = 3
PL_DECAY = 0.01
PL_WEIGHT = 2.0
moving_average = True
def main(opts):
# Create the data loader
loader = sunnerData.DataLoader(sunnerData.ImageDataset(
root=[[opts.path]],
transform=transforms.Compose([
sunnertransforms.Resize((opts.resolution, opts.resolution)),
sunnertransforms.ToTensor(),
sunnertransforms.ToFloat(),
sunnertransforms.Transpose(sunnertransforms.BHWC2BCHW),
sunnertransforms.Normalize(),
])),
batch_size=opts.batch_size,
shuffle=True,
drop_last=True
)
# Create the model
start_epoch = 0
G = G_stylegan2(fmap_base=opts.fmap_base,
resolution=opts.resolution,
mapping_layers=opts.mapping_layers,
opts=opts,
return_dlatents=True)
D = D_stylegan2(fmap_base=opts.fmap_base,
resolution=opts.resolution,
structure='resnet')
# Load the pre-trained weight
if os.path.exists(opts.resume):
INFO("Load the pre-trained weight!")
state = torch.load(opts.resume)
G.load_state_dict(state['G'])
D.load_state_dict(state['D'])
start_epoch = state['start_epoch']
else:
INFO("Pre-trained weight cannot load successfully, train from scratch!")
# Multi-GPU support
if torch.cuda.device_count() > 1:
INFO("Multiple GPU:" + str(torch.cuda.device_count()) + "\t GPUs")
G = torch.nn.DataParallel(G)
D = torch.nn.DataParallel(D)
G.to(opts.device)
D.to(opts.device)
# Create the criterion, optimizer and scheduler
loss_type = 'styleGAN' # 'Rah' / 'styleGAN' / 'GAN'
lr_D = 0.003
lr_G = 0.003
optim_D = torch.optim.Adam(D.parameters(), lr=lr_D, betas=(0.9, 0.999))
# g_mapping has 100x lower learning rate
params_G = [{"params": G.g_synthesis.parameters()},
{"params": G.g_mapping.parameters(), "lr": lr_G * 0.01}]
optim_G = torch.optim.Adam(params_G, lr=lr_G, betas=(0.9, 0.999))
scheduler_D = optim.lr_scheduler.ExponentialLR(optim_D, gamma=0.99)
scheduler_G = optim.lr_scheduler.ExponentialLR(optim_G, gamma=0.99)
# Train
if moving_average:
avg_param_G = copy_G_params(G)
fix_z = torch.randn([opts.batch_size, 512]).to(opts.device)
softplus = torch.nn.Softplus()
Loss_D_list = [0.0]
Loss_G_list = [0.0]
for ep in range(start_epoch, opts.epoch):
bar = tqdm(loader)
loss_D_list = []
loss_G_list = []
for i, (real_img,) in enumerate(bar):
real_img = real_img.to(opts.device)
latents = torch.randn([real_img.size(0), 512]).to(opts.device)
# =======================================================================================================
# (1) Update D network: D_logistic_r1(default)
# =======================================================================================================
# Compute adversarial loss toward discriminator
real_img = real_img.to(opts.device)
real_logit = D(real_img)
fake_img, fake_dlatent = G(latents)
fake_logit = D(fake_img.detach())
if loss_type == 'styleGAN':
d_loss = softplus(fake_logit)
d_loss = d_loss + softplus(-real_logit)
# original
r1_penalty = D_logistic_r1(real_img.detach(), D)
d_loss = (d_loss + r1_penalty).mean()
# lite
# d_loss = d_loss.mean()
elif loss_type == 'Rah':
# difference between real and fake:
r_f_diff = real_logit - torch.mean(fake_logit)
# difference between fake and real samples
f_r_diff = fake_logit - torch.mean(real_logit)
d_loss = (torch.mean(torch.nn.ReLU()(1 - r_f_diff))
+ torch.mean(torch.nn.ReLU()(1 + f_r_diff)))
elif loss_type == 'GAN':
import torch.nn as nn
criterion = nn.BCEWithLogitsLoss()
d_loss = (criterion(real_logit.squeeze(), torch.ones(real_img.size(0)).to(opts.device))
+ criterion(fake_logit.squeeze(), torch.zeros(fake_img.size(0)).to(opts.device)))
else:
print("Loss type not exist!")
exit()
loss_D_list.append(d_loss.mean().item())
# Update discriminator
optim_D.zero_grad()
d_loss.backward()
optim_D.step()
# =======================================================================================================
# (2) Update G network: G_logistic_ns_pathreg(default)
# =======================================================================================================
# if i % CRITIC_ITER == 0:
G.zero_grad()
fake_scores_out = D(fake_img)
if loss_type == 'styleGAN':
_g_loss = softplus(-fake_scores_out)
# Compute |J*y|.
# pl_noise = (torch.randn(fake_img.shape) / np.sqrt(fake_img.shape[2] * fake_img.shape[3])).to(fake_img.device)
# pl_grads = grad(torch.sum(fake_img * pl_noise), fake_dlatent, retain_graph=True)[0]
# pl_lengths = torch.sqrt(torch.sum(torch.sum(torch.mul(pl_grads, pl_grads), dim=2), dim=1))
# pl_mean = PL_DECAY * torch.sum(pl_lengths)
#
# pl_penalty = torch.mul(pl_lengths - pl_mean, pl_lengths - pl_mean)
# reg = pl_penalty * PL_WEIGHT
#
# # original
# g_loss = (_g_loss + reg).mean()
# lite
g_loss = _g_loss.mean()
elif loss_type == 'Rah':
real_scores_out = D(real_img)
# difference between real and fake:
r_f_diff = real_scores_out - torch.mean(fake_scores_out)
# difference between fake and real samples
f_r_diff = fake_scores_out - torch.mean(real_scores_out)
# return the loss
g_loss = (torch.mean(torch.nn.ReLU()(1 + r_f_diff))
+ torch.mean(torch.nn.ReLU()(1 - f_r_diff)))
elif loss_type == 'GAN':
import torch.nn as nn
criterion = nn.BCEWithLogitsLoss()
g_loss = criterion(fake_scores_out.squeeze(), torch.ones(fake_img.size(0)).to(opts.device))
else:
print("Loss type not exist!")
exit()
loss_G_list.append(g_loss.mean().item())
# Update generator
g_loss.backward(retain_graph=True)
optim_G.step()
# Output training stats
bar.set_description(
"Epoch {} [{}, {}] [G]: {} [D]: {}".format(ep, i + 1, len(loader), loss_G_list[-1], loss_D_list[-1]))
if moving_average:
for p, avg_p in zip(G.parameters(), avg_param_G):
avg_p.mul_(0.999).add_(0.001, p.data)
# Save the result
Loss_G_list.append(np.mean(loss_G_list))
Loss_D_list.append(np.mean(loss_D_list))
# Save model
state = {
'G': G.state_dict(),
'D': D.state_dict(),
'Loss_G': Loss_G_list,
'Loss_D': Loss_D_list,
'start_epoch': ep,
}
torch.save(state, os.path.join(opts.det, 'models', 'all_model_epoch_%d.pth' % (ep)))
# Check how the generator is doing by saving G's output on fixed_noise
if moving_average:
backup_para = copy_G_params(G)
load_params(G, avg_param_G)
with torch.no_grad():
fake_img = G(fix_z)[0].detach().cpu()
save_image(fake_img, os.path.join(opts.det, 'images', str(ep) + '.png'), nrow=5, normalize=True)
# Save avg_G model
torch.save(G.state_dict(), os.path.join(opts.det, 'models', 'Avg_G_epoch_%d.pth' % (ep)))
if moving_average:
load_params(G, backup_para)
scheduler_D.step()
scheduler_G.step()
# Plot the total loss curve
Loss_D_list = Loss_D_list[1:]
Loss_G_list = Loss_G_list[1:]
plotLossCurve(opts, Loss_D_list, Loss_G_list)
if __name__ == '__main__':
opts = TrainOptions().parse()
main(opts)