基于pytorch的DCGAN生成11*11的黑白图像代码

下面是一个基于PyTorch实现的DCGAN生成11*11的黑白图像的代码示例：

import torch
import torch.nn as nn
import torch.optim as optim
import numpy as np
import matplotlib.pyplot as plt
from torchvision import datasets, transforms

# 定义生成器模型
class Generator(nn.Module):
    def __init__(self, image_size=11, latent_dim=100, hidden_dim=64):
        super(Generator, self).__init__()
        self.image_size = image_size
        self.latent_dim = latent_dim
        self.hidden_dim = hidden_dim
        self.main = nn.Sequential(
            nn.ConvTranspose2d(self.latent_dim, self.hidden_dim * 4, 4, 1, 0, bias=False),
            nn.BatchNorm2d(self.hidden_dim * 4),
            nn.ReLU(True),
            nn.ConvTranspose2d(self.hidden_dim * 4, self.hidden_dim * 2, 4, 2, 1, bias=False),
            nn.BatchNorm2d(self.hidden_dim * 2),
            nn.ReLU(True),
            nn.ConvTranspose2d(self.hidden_dim * 2, self.hidden_dim, 4, 2, 1, bias=False),
            nn.BatchNorm2d(self.hidden_dim),
            nn.ReLU(True),
            nn.ConvTranspose2d(self.hidden_dim, 1, 4, 2, 1, bias=False),
            nn.Tanh()
        )

    def forward(self, input):
        return self.main(input.view(-1, self.latent_dim, 1, 1))

# 定义判别器模型
class Discriminator(nn.Module):
    def __init__(self, image_size=11, hidden_dim=64):
        super(Discriminator, self).__init__()
        self.image_size = image_size
        self.hidden_dim = hidden_dim
        self.main = nn.Sequential(
            nn.Conv2d(1, self.hidden_dim, 4, 2, 1, bias=False),
            nn.LeakyReLU(0.2, inplace=True),
            nn.Conv2d(self.hidden_dim, self.hidden_dim * 2, 4, 2, 1, bias=False),
            nn.BatchNorm2d(self.hidden_dim * 2),
            nn.LeakyReLU(0.2, inplace=True),
            nn.Conv2d(self.hidden_dim * 2, self.hidden_dim * 4, 4, 2, 1, bias=False),
            nn.BatchNorm2d(self.hidden_dim * 4),
            nn.LeakyReLU(0.2, inplace=True),
            nn.Conv2d(self.hidden_dim * 4, 1, 4, 1, 0, bias=False),
            nn.Sigmoid()
        )

    def forward(self, input):
        return self.main(input).view(-1, 1)

# 定义训练函数
def train(generator, discriminator, dataloader, num_epochs=20, batch_size=64, lr=0.0002, beta1=0.5):
    device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
    generator.to(device)
    discriminator.to(device)

    # 定义损失函数和优化器
    criterion = nn.BCELoss()
    optimizerG = optim.Adam(generator.parameters(), lr=lr, betas=(beta1, 0.999))
    optimizerD = optim.Adam(discriminator.parameters(), lr=lr, betas=(beta1, 0.999))

    # 定义噪声向量
    fixed_noise = torch.randn(64, 100, 1, 1, device=device)

    # 开始训练
    for epoch in range(num_epochs):
        for i, data in enumerate(dataloader, 0):
            # 更新判别器模型
            discriminator.zero_grad()
            real_cpu = data[0].to(device)
            b_size = real_cpu.size(0)
            label = torch.full((b_size,), 1, device=device)
            output = discriminator(real_cpu)
            errD_real = criterion(output, label)

            noise = torch.randn(b_size, 100, 1, 1, device=device)
            fake = generator(noise)
            label.fill_(0)
            output = discriminator(fake.detach())
            errD_fake = criterion(output, label)

            errD = errD_real + errD_fake
            errD.backward()
            optimizerD.step()

            # 更新生成器模型
            generator.zero_grad()
            label.fill_(1)
            output = discriminator(fake)
            errG = criterion(output, label)
            errG.backward()
            optimizerG.step()

            # 打印损失函数和生成的图像
            if i % 100 == 0:
                print('[%d/%d][%d/%d]\tLoss_D: %.4f\tLoss_G: %.4f'
                      % (epoch, num_epochs, i, len(dataloader),
                         errD.item(), errG.item()))
                with torch.no_grad():
                    fake = generator(fixed_noise).detach().cpu()
                plt.imshow(fake[0][0], cmap='gray')
                plt.show()

使用MNIST数据集训练这个模型：

dataset = datasets.MNIST(root='./data', train=True, transform=transforms.Compose([
    transforms.Resize(11),
    transforms.ToTensor(),
    transforms.Normalize((0.5,), (0.5,))
]), download=True)

dataloader = torch.utils.data.DataLoader(dataset, batch_size=64, shuffle=True, num_workers=2)

generator = Generator()
discriminator = Discriminator()

train(generator, discriminator, dataloader)

这个模型的训练过程可能需要几个小时或者更长时间，具体取决于你的计算机性能和数据集大小。