| import torch |
| from torch import nn |
| import torch.optim as optim |
| import torch.nn.functional as F |
| from torch.utils.data.dataloader import DataLoader |
| from torchvision import transforms |
| from torchvision import utils as vutils |
|
|
| from models import Generator |
| from utils import copy_G_params, load_params |
|
|
|
|
|
|
| def get_early_features(net, noise): |
| with torch.no_grad(): |
| feat_4 = net._init(noise) |
| feat_8 = net._upsample_8(feat_4) |
| feat_16 = net._upsample_16(feat_8) |
| feat_32 = net._upsample_32(feat_16) |
| feat_64 = net._upsample_64(feat_32) |
| return feat_8, feat_16, feat_32, feat_64 |
|
|
| def get_late_features(net, feat_64, feat_8, feat_16, feat_32): |
| with torch.no_grad(): |
| feat_128 = net._upsample_128(feat_64) |
| feat_128 = net._sle_128(feat_8, feat_128) |
|
|
| feat_256 = net._upsample_256(feat_128) |
| feat_256 = net._sle_256(feat_16, feat_256) |
|
|
| feat_512 = net._upsample_512(feat_256) |
| feat_512 = net._sle_512(feat_32, feat_512) |
|
|
| feat_1024 = net._upsample_1024(feat_512) |
|
|
| return net._out_1024(feat_1024) |
|
|
| def style_mix(model_name_or_path, bs, device): |
| _in_channels = 256 |
| im_size = 1024 |
|
|
| netG = Generator(in_channels=_in_channels, out_channels=3) |
| netG = netG.from_pretrained(model_name_or_path, in_channels=256, out_channels=3) |
| _ = netG.to(device) |
| _ = netG.eval() |
|
|
| avg_param_G = copy_G_params(netG) |
| load_params(netG, avg_param_G) |
|
|
| noise_a = torch.randn(bs, 256, 1, 1, device=device).to(device) |
| noise_b = torch.randn(bs, 256, 1, 1, device=device).to(device) |
|
|
| feat_8_a, feat_16_a, feat_32_a, feat_64_a = get_early_features(netG, noise_a) |
| feat_8_b, feat_16_b, feat_32_b, feat_64_b = get_early_features(netG, noise_b) |
|
|
| images_b = get_late_features(netG, feat_64_b, feat_8_b, feat_16_b, feat_32_b) |
| images_a = get_late_features(netG, feat_64_a, feat_8_a, feat_16_a, feat_32_a) |
|
|
| imgs = [ torch.ones(1, 3, im_size, im_size) ] |
|
|
| imgs.append(images_b.cpu()) |
| for i in range(bs): |
| imgs.append(images_a[i].unsqueeze(0).cpu()) |
| gimgs = get_late_features(netG, feat_64_a[i].unsqueeze(0).repeat(bs, 1, 1, 1), feat_8_b, feat_16_b, feat_32_b) |
| imgs.append(gimgs.cpu()) |
|
|
| imgs = torch.cat(imgs) |
| |
|
|
| return imgs |
|
|
