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synthesis.py
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synthesis.py
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# python3.7
"""Script that synthesizes images with pre-trained models.
Support StyleGAN2 and StyleGAN3.
"""
import os
import argparse
from tqdm import tqdm
import numpy as np
import torch
from models import build_model
from utils.visualizers.html_visualizer import HtmlVisualizer
from utils.image_utils import save_image, resize_image
from utils.image_utils import postprocess_image
from utils.custom_utils import to_numpy
def parse_args():
"""Parses arguments."""
parser = argparse.ArgumentParser()
group = parser.add_argument_group('General options.')
group.add_argument('weight_path', type=str,
help='Weight path to the pre-trained model.')
group.add_argument('--save_dir', type=str, default=None,
help='Directory to save the results. If not specified, '
'the results will be saved to '
'`work_dirs/{TASK_SPECIFIC}/` by default.')
group.add_argument('--job', type=str, default='synthesize',
help='Name for the job. (default: synthesize)')
group.add_argument('--seed', type=int, default=4,
help='Seed for sampling. (default: 4)')
group.add_argument('--nums', type=int, default=100,
help='Number of samples to synthesized. (default: 100)')
group.add_argument('--img_size', type=int, default=1024,
help='Size of the synthesized images. (default: 1024)')
group.add_argument('--vis_size', type=int, default=256,
help='Size of the visualize images. (default: 256)')
group.add_argument('--w_dim', type=int, default=512,
help='Dimension of the latent w. (default: 512)')
group.add_argument('--batch_size', type=int, default=4,
help='Batch size. (default: 4)')
group.add_argument('--save_jpg', action='store_true', default=False,
help='Whether to save raw image. (default: False)')
group.add_argument('-d', '--data_name', type=str, default='ffhq',
help='Name of the datasets. (default: ffhq)')
group.add_argument('--latent_path', type=str, default='',
help='Path to the given latent codes. (default: None)')
group.add_argument('--trunc_psi', type=float, default=0.7,
help='Psi factor used for truncation. (default: 0.7)')
group.add_argument('--trunc_layers', type=int, default=8,
help='Number of layers to perform truncation.'
' (default: 8)')
group = parser.add_argument_group('StyleGAN2')
group.add_argument('--stylegan2', action='store_true',
help='Whether or not using StyleGAN2. (default: False)')
group.add_argument('--scale_stylegan2', type=float, default=1.0,
help='Scale for the number of channel fro stylegan2.')
group.add_argument('--randomize_noise', type=str, default='const',
help='Noise type when synthesizing. (const or random)')
group = parser.add_argument_group('StyleGAN3')
group.add_argument('--stylegan3', action='store_true',
help='Whether or not using StyleGAN3. (default: False)')
group.add_argument('--cfg', type=str, default='T',
help='Config of the stylegan3 (T/R).')
group.add_argument('--scale_stylegan3r', type=float, default=2.0,
help='Scale for the number of channel for stylegan3 R.')
group.add_argument('--scale_stylegan3t', type=float, default=1.0,
help='Scale for the number of channel for stylegan3 T.')
group.add_argument('--tx', type=float, default=0,
help='Translate X-coordinate. (default: 0.0)')
group.add_argument('--ty', type=float, default=0,
help='Translate Y-coordinate. (default: 0.0)')
group.add_argument('--rotate', type=float, default=0,
help='Rotation angle in degrees. (default: 0)')
return parser.parse_args()
def main():
"""Main function."""
args = parse_args()
# Parse model configuration.
assert (args.stylegan2 and not args.stylegan3) or \
(not args.stylegan2 and args.stylegan3)
job_disc = ''
if args.stylegan2:
config = dict(model_type='StyleGAN2Generator',
resolution=args.img_size,
w_dim=args.w_dim,
fmaps_base=int(args.scale_stylegan2 * (32 << 10)),
fmaps_max=512,)
job_disc += 'stylegan2'
else:
if args.stylegan3 and args.cfg == 'R':
config = dict(model_type='StyleGAN3Generator',
resolution=args.img_size,
w_dim=args.w_dim,
fmaps_base=int(args.scale_stylegan3r * (32 << 10)),
fmaps_max=1024,
use_radial_filter=True,)
job_disc += 'stylegan3r'
elif args.stylegan3 and args.cfg == 'T':
config = dict(model_type='StyleGAN3Generator',
resolution=args.img_size,
w_dim=args.w_dim,
fmaps_base=int(args.scale_stylegan3t * (32 << 10)),
fmaps_max=512,
use_radial_filter=False,
kernel_size=3,)
job_disc += 'stylegan3t'
else:
raise TypeError(f'StyleGAN3 config type error, need `R/T`,'
f' but got {args.cfg} instead.')
# Get work directory and job name.
save_dir = args.save_dir or f'work_dirs/{args.job}/{args.data_name}'
os.makedirs(save_dir, exist_ok=True)
job_name = f'seed_{args.seed}_num_{args.nums}_{job_disc}'
os.makedirs(f'{save_dir}/{job_name}', exist_ok=True)
# Build generation and get synthesis kwargs.
print('Building generator...')
generator = build_model(**config)
synthesis_kwargs = dict(trunc_psi=args.trunc_psi,
trunc_layers=args.trunc_layers,)
# Load pre-trained weights.
checkpoint_path = args.weight_path
print(f'Loading checkpoint from `{checkpoint_path}` ...')
checkpoint = torch.load(checkpoint_path, map_location='cpu')['models']
if 'generator_smooth' in checkpoint:
generator.load_state_dict(checkpoint['generator_smooth'])
else:
generator.load_state_dict(checkpoint['generator'])
generator = generator.eval().cuda()
print('Finish loading checkpoint.')
np.random.seed(args.seed)
torch.manual_seed(args.seed)
if os.path.exists(args.latent_path):
latent_zs = np.load(args.latent_path)
latent_zs = latent_zs[:args.nums]
else:
latent_zs = np.random.randn(args.nums, generator.z_dim)
num_images = latent_zs.shape[0]
latent_zs = torch.from_numpy(latent_zs.astype(np.float32))
html = HtmlVisualizer(grid_size=num_images)
print(f'Synthesizing {num_images} images ...')
latent_ws = []
for batch_idx in tqdm(range(0, num_images, args.batch_size)):
latent_z = latent_zs[batch_idx:batch_idx + args.batch_size]
latent_z = latent_z.cuda()
with torch.no_grad():
g_outputs = generator(latent_z, **synthesis_kwargs)
g_image = to_numpy(g_outputs['image'])
images = postprocess_image(g_image)
for idx in range(images.shape[0]):
sub_idx = batch_idx + idx
img = images[idx]
row_idx, col_idx = divmod(sub_idx, html.num_cols)
image = resize_image(img, (args.vis_size, args.vis_size))
html.set_cell(row_idx, col_idx, image=image,
text=f'Sample {sub_idx:06d}')
if args.save_jpg:
save_path = f'{save_dir}/{job_name}/{sub_idx:06d}.jpg'
save_image(save_path, img)
latent_ws.append(to_numpy(g_outputs['wp']))
latent_ws = np.concatenate(latent_ws, axis=0)
print(f'shape of the latent code: {latent_ws.shape}')
np.save(f'{save_dir}/{job_name}/latent_codes.npy', latent_ws)
html.save(f'{save_dir}/{job_name}.html')
print(f'Finish synthesizing {num_images} samples.')
if __name__ == '__main__':
main()