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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# 9.11 样式迁移"
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"cuda 1.1.0\n"
]
}
],
"source": [
"%matplotlib inline\n",
"import time\n",
"import torch\n",
"import torch.nn.functional as F\n",
"import torchvision\n",
"import numpy as np\n",
"from PIL import Image\n",
"\n",
"import sys\n",
"sys.path.append(\"..\") \n",
"import d2lzh_pytorch as d2l\n",
"device = torch.device('cuda' if torch.cuda.is_available() else 'cpu') # 均已测试\n",
"\n",
"print(device, torch.__version__)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 9.11.2 读取内容图像和样式图像"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {},
"outputs": [
{
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},
"metadata": {},
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}
],
"source": [
"d2l.set_figsize()\n",
"content_img = Image.open('../../data/rainier.jpg')\n",
"d2l.plt.imshow(content_img);"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {},
"outputs": [
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"text/plain": [
"<matplotlib.figure.Figure at 0x7f013512fe48>"
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"d2l.set_figsize()\n",
"style_img = Image.open('../../data/autumn_oak.jpg')\n",
"d2l.plt.imshow(style_img);"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 9.11.3. 预处理和后处理图像"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"rgb_mean = np.array([0.485, 0.456, 0.406])\n",
"rgb_std = np.array([0.229, 0.224, 0.225])\n",
"\n",
"def preprocess(PIL_img, image_shape):\n",
" process = torchvision.transforms.Compose([\n",
" torchvision.transforms.Resize(image_shape),\n",
" torchvision.transforms.ToTensor(),\n",
" torchvision.transforms.Normalize(mean=rgb_mean, std=rgb_std)])\n",
"\n",
" return process(PIL_img).unsqueeze(dim = 0) # (batch_size, 3, H, W)\n",
"\n",
"def postprocess(img_tensor):\n",
" inv_normalize = torchvision.transforms.Normalize(\n",
" mean= -rgb_mean / rgb_std,\n",
" std= 1/rgb_std)\n",
" to_PIL_image = torchvision.transforms.ToPILImage()\n",
" return to_PIL_image(inv_normalize(img_tensor[0].cpu()).clamp(0, 1))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 9.11.4 抽取特征"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"/data1/tangss/PyTorch_pretrainedmodels\r\n"
]
}
],
"source": [
"!echo $TORCH_HOME # 将会把预训练好的模型下载到此处(没有输出的话默认是.cache/torch)\n",
"pretrained_net = torchvision.models.vgg19(pretrained=True, progress=True)"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {},
"outputs": [
{
"data": {
"text/plain": [
"VGG(\n",
" (features): Sequential(\n",
" (0): Conv2d(3, 64, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (1): ReLU(inplace)\n",
" (2): Conv2d(64, 64, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (3): ReLU(inplace)\n",
" (4): MaxPool2d(kernel_size=2, stride=2, padding=0, dilation=1, ceil_mode=False)\n",
" (5): Conv2d(64, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (6): ReLU(inplace)\n",
" (7): Conv2d(128, 128, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (8): ReLU(inplace)\n",
" (9): MaxPool2d(kernel_size=2, stride=2, padding=0, dilation=1, ceil_mode=False)\n",
" (10): Conv2d(128, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (11): ReLU(inplace)\n",
" (12): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (13): ReLU(inplace)\n",
" (14): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (15): ReLU(inplace)\n",
" (16): Conv2d(256, 256, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (17): ReLU(inplace)\n",
" (18): MaxPool2d(kernel_size=2, stride=2, padding=0, dilation=1, ceil_mode=False)\n",
" (19): Conv2d(256, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (20): ReLU(inplace)\n",
" (21): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (22): ReLU(inplace)\n",
" (23): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (24): ReLU(inplace)\n",
" (25): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (26): ReLU(inplace)\n",
" (27): MaxPool2d(kernel_size=2, stride=2, padding=0, dilation=1, ceil_mode=False)\n",
" (28): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (29): ReLU(inplace)\n",
" (30): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (31): ReLU(inplace)\n",
" (32): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (33): ReLU(inplace)\n",
" (34): Conv2d(512, 512, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))\n",
" (35): ReLU(inplace)\n",
" (36): MaxPool2d(kernel_size=2, stride=2, padding=0, dilation=1, ceil_mode=False)\n",
" )\n",
" (avgpool): AdaptiveAvgPool2d(output_size=(7, 7))\n",
" (classifier): Sequential(\n",
" (0): Linear(in_features=25088, out_features=4096, bias=True)\n",
" (1): ReLU(inplace)\n",
" (2): Dropout(p=0.5)\n",
" (3): Linear(in_features=4096, out_features=4096, bias=True)\n",
" (4): ReLU(inplace)\n",
" (5): Dropout(p=0.5)\n",
" (6): Linear(in_features=4096, out_features=1000, bias=True)\n",
" )\n",
")"
]
},
"execution_count": 6,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"pretrained_net"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"style_layers, content_layers = [0, 5, 10, 19, 28], [25]"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"net_list = []\n",
"for i in range(max(content_layers + style_layers) + 1):\n",
" net_list.append(pretrained_net.features[i])\n",
"net = torch.nn.Sequential(*net_list)"
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"def extract_features(X, content_layers, style_layers):\n",
" contents = []\n",
" styles = []\n",
" for i in range(len(net)):\n",
" X = net[i](X)\n",
" if i in style_layers:\n",
" styles.append(X)\n",
" if i in content_layers:\n",
" contents.append(X)\n",
" return contents, styles"
]
},
{
"cell_type": "code",
"execution_count": 10,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"def get_contents(image_shape, device):\n",
" content_X = preprocess(content_img, image_shape).to(device)\n",
" contents_Y, _ = extract_features(content_X, content_layers, style_layers)\n",
" return content_X, contents_Y\n",
"\n",
"def get_styles(image_shape, device):\n",
" style_X = preprocess(style_img, image_shape).to(device)\n",
" _, styles_Y = extract_features(style_X, content_layers, style_layers)\n",
" return style_X, styles_Y"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 9.11.5 定义损失函数\n",
"### 9.11.5.1 内容损失"
]
},
{
"cell_type": "code",
"execution_count": 11,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"def content_loss(Y_hat, Y):\n",
" return F.mse_loss(Y_hat, Y)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### 9.11.5.2 样式损失"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"def gram(X):\n",
" num_channels, n = X.shape[1], X.shape[2] * X.shape[3]\n",
" X = X.view(num_channels, n)\n",
" return torch.matmul(X, X.t()) / (num_channels * n)"
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"def style_loss(Y_hat, gram_Y):\n",
" return F.mse_loss(gram(Y_hat), gram_Y)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### 9.11.5.3 总变差损失"
]
},
{
"cell_type": "code",
"execution_count": 14,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"def tv_loss(Y_hat):\n",
" return 0.5 * (F.l1_loss(Y_hat[:, :, 1:, :], Y_hat[:, :, :-1, :]) + \n",
" F.l1_loss(Y_hat[:, :, :, 1:], Y_hat[:, :, :, :-1]))"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### 9.11.5.4 损失函数"
]
},
{
"cell_type": "code",
"execution_count": 15,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"content_weight, style_weight, tv_weight = 1, 1e3, 10\n",
"\n",
"def compute_loss(X, contents_Y_hat, styles_Y_hat, contents_Y, styles_Y_gram):\n",
" # 分别计算内容损失、样式损失和总变差损失\n",
" contents_l = [content_loss(Y_hat, Y) * content_weight for Y_hat, Y in zip(\n",
" contents_Y_hat, contents_Y)]\n",
" styles_l = [style_loss(Y_hat, Y) * style_weight for Y_hat, Y in zip(\n",
" styles_Y_hat, styles_Y_gram)]\n",
" tv_l = tv_loss(X) * tv_weight\n",
" # 对所有损失求和\n",
" l = sum(styles_l) + sum(contents_l) + tv_l\n",
" return contents_l, styles_l, tv_l, l"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 9.11.6 创建和初始化合成图像"
]
},
{
"cell_type": "code",
"execution_count": 16,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"class GeneratedImage(torch.nn.Module):\n",
" def __init__(self, img_shape):\n",
" super(GeneratedImage, self).__init__()\n",
" self.weight = torch.nn.Parameter(torch.rand(*img_shape))\n",
"\n",
" def forward(self):\n",
" return self.weight"
]
},
{
"cell_type": "code",
"execution_count": 17,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"def get_inits(X, device, lr, styles_Y):\n",
" gen_img = GeneratedImage(X.shape).to(device)\n",
" gen_img.weight.data = X.data\n",
" optimizer = torch.optim.Adam(gen_img.parameters(), lr=lr)\n",
" styles_Y_gram = [gram(Y) for Y in styles_Y]\n",
" return gen_img(), styles_Y_gram, optimizer"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 9.11.7 训练"
]
},
{
"cell_type": "code",
"execution_count": 18,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"def train(X, contents_Y, styles_Y, device, lr, max_epochs, lr_decay_epoch):\n",
" print(\"training on \", device)\n",
" X, styles_Y_gram, optimizer = get_inits(X, device, lr, styles_Y)\n",
" scheduler = torch.optim.lr_scheduler.StepLR(optimizer, lr_decay_epoch, gamma=0.1)\n",
" for i in range(max_epochs):\n",
" start = time.time()\n",
" \n",
" contents_Y_hat, styles_Y_hat = extract_features(\n",
" X, content_layers, style_layers)\n",
" contents_l, styles_l, tv_l, l = compute_loss(\n",
" X, contents_Y_hat, styles_Y_hat, contents_Y, styles_Y_gram)\n",
" \n",
" optimizer.zero_grad()\n",
" l.backward(retain_graph = True)\n",
" optimizer.step()\n",
" scheduler.step()\n",
" \n",
" if i % 50 == 0 and i != 0:\n",
" print('epoch %3d, content loss %.2f, style loss %.2f, '\n",
" 'TV loss %.2f, %.2f sec'\n",
" % (i, sum(contents_l).item(), sum(styles_l).item(), tv_l.item(),\n",
" time.time() - start))\n",
" return X.detach()"
]
},
{
"cell_type": "code",
"execution_count": 19,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"training on cuda\n",
"epoch 50, content loss 0.24, style loss 1.11, TV loss 1.33, 0.07 sec\n",
"epoch 100, content loss 0.24, style loss 0.81, TV loss 1.20, 0.07 sec\n",
"epoch 150, content loss 0.24, style loss 0.72, TV loss 1.12, 0.07 sec\n",
"epoch 200, content loss 0.24, style loss 0.68, TV loss 1.06, 0.07 sec\n",
"epoch 250, content loss 0.23, style loss 0.68, TV loss 1.05, 0.07 sec\n",
"epoch 300, content loss 0.23, style loss 0.67, TV loss 1.04, 0.07 sec\n",
"epoch 350, content loss 0.23, style loss 0.67, TV loss 1.04, 0.07 sec\n",
"epoch 400, content loss 0.23, style loss 0.67, TV loss 1.03, 0.07 sec\n",
"epoch 450, content loss 0.23, style loss 0.67, TV loss 1.03, 0.07 sec\n"
]
}
],
"source": [
"image_shape = (150, 225)\n",
"net = net.to(device)\n",
"content_X, contents_Y = get_contents(image_shape, device)\n",
"style_X, styles_Y = get_styles(image_shape, device)\n",
"output = train(content_X, contents_Y, styles_Y, device, 0.01, 500, 200)"
]
},
{
"cell_type": "code",
"execution_count": 20,
"metadata": {},
"outputs": [
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"source": [
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]
},
{
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"execution_count": 21,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"training on cuda\n",
"epoch 50, content loss 0.34, style loss 0.63, TV loss 0.79, 0.18 sec\n",
"epoch 100, content loss 0.30, style loss 0.50, TV loss 0.74, 0.18 sec\n",
"epoch 150, content loss 0.29, style loss 0.46, TV loss 0.72, 0.18 sec\n",
"epoch 200, content loss 0.28, style loss 0.43, TV loss 0.70, 0.18 sec\n",
"epoch 250, content loss 0.28, style loss 0.43, TV loss 0.69, 0.18 sec\n",
"epoch 300, content loss 0.27, style loss 0.42, TV loss 0.69, 0.18 sec\n",
"epoch 350, content loss 0.27, style loss 0.42, TV loss 0.69, 0.18 sec\n",
"epoch 400, content loss 0.27, style loss 0.42, TV loss 0.69, 0.18 sec\n",
"epoch 450, content loss 0.27, style loss 0.42, TV loss 0.69, 0.18 sec\n"
]
}
],
"source": [
"image_shape = (300, 450)\n",
"_, content_Y = get_contents(image_shape, device)\n",
"_, style_Y = get_styles(image_shape, device)\n",
"X = preprocess(postprocess(output), image_shape).to(device)\n",
"big_output = train(X, content_Y, style_Y, device, 0.01, 500, 200)"
]
},
{
"cell_type": "code",
"execution_count": 22,
"metadata": {},
"outputs": [
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