PyTorch逆卷积ConvTranspose2d详解与应用

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"逆卷积(ConvTranspose2d)在PyTorch中的应用及理解" 逆卷积,也称为上采样卷积或转置卷积,是深度学习中用于图像生成、 upsampling 和反卷积网络的核心操作。在PyTorch中,这个操作通过`torch.nn.ConvTranspose2d`模块来实现。它主要用于将低分辨率的特征图恢复到较高分辨率,同时允许添加新的特征信息。 `torch.nn.ConvTranspose2d`的主要参数包括: 1. `in_channels`: 输入特征图的通道数。 2. `out_channels`: 输出特征图的通道数。 3. `kernel_size`: 卷积核的尺寸,可以是单个数值或一个包含两个元素的元组,分别对应宽度和高度。 4. `stride`: 卷积步长,决定每次移动的距离,同样可以是单个数值或一个包含两个元素的元组。 5. `padding`: 在输入特征图边缘添加的零的数目,以确保输出尺寸不变。 6. `output_padding`: 对输出特征图的额外填充,用于微调输出尺寸。 7. `groups`: 控制输入和权重之间的连接方式,例如1表示所有输入通道都连接到所有输出通道,大于1则表示分组卷积。 8. `bias`: 是否使用偏置项,默认为True。 9. `dilation`: 控制滤波器中元素间的空隙,增加感受野。 10. `padding_mode`: 填充模式,默认为'zeros',也可以是'reflect'或'symmetric'。 卷积的转置过程可以分为内部变换和外部变换两个步骤: **内部变换**:如果在原始卷积中设置了`stride > 1`,那么在逆卷积时,需要对输入特征图进行插值操作。这意味着在特征图的每一行和列的相邻元素之间插入`(stride - 1)`个零值。这使得逆卷积后得到的特征图尺寸可以匹配原始卷积前的尺寸。 **外部变换**:外部变换与原始卷积的`padding`有关。在原始卷积中,`padding`是为了保持输出尺寸不变而添加的零。在逆卷积中,我们需要去除这些额外的零,以恢复原始输入的尺寸。如果在原始卷积中有`padding`,那么在逆卷积中可能需要使用`output_padding`来调整输出尺寸,使其精确地等于输入尺寸。 逆卷积在实际应用中,比如在U-Net这样的网络架构中,用于将下采样的特征信息恢复到原始输入的尺寸,同时结合低级特征以生成高质量的输出图像。此外,它也在图像超分辨率、语义分割和图像风格转换等任务中发挥重要作用。 总结来说,`nn.ConvTranspose2d`是PyTorch中用于执行逆卷积操作的关键模块,它允许我们恢复特征图的尺寸,同时引入新的特征信息,这对于理解和构建深度学习模型中的upsampling和图像生成部分至关重要。正确理解和运用这些参数能帮助优化网络性能,适应不同的计算机视觉任务需求。

pretrained_dict = torch.load('E:/fin/models/gen.pth') print(pretrained_dict.keys())上述语句打印出的键值dict_keys(['iteration', 'generator']) 怎么和下列生成器对齐:class ContextEncoder(nn.Module): def __init__(self): super(ContextEncoder, self).__init__() # 编码器 self.encoder = nn.Sequential( nn.Conv2d(4, 64, kernel_size=4, stride=2, padding=1), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(64, 128, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(128), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(128, 256, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(256), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(256, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), ) # 解码器 self.decoder = nn.Sequential( nn.ConvTranspose2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.ReLU(inplace=True), nn.ConvTranspose2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.ReLU(inplace=True), nn.ConvTranspose2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.ReLU(inplace=True), nn.ConvTranspose2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.ReLU(inplace=True), nn.ConvTranspose2d(512, 256, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(256), nn.ReLU(inplace=True), nn.ConvTranspose2d(256, 128, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(128), nn.ReLU(inplace=True), nn.ConvTranspose2d(128, 64, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(64), nn.ReLU(inplace=True), nn.ConvTranspose2d(64, 3, kernel_size=4, stride=2, padding=1), nn.Sigmoid(), ) def forward(self, x): x = self.encoder(x) x = self.decoder(x) return x

2023-05-11 上传

加载InpaintingModel_gen.pth预训练模型时出现:RuntimeError: Error(s) in loading state_dict for ContextEncoder: Missing key(s) in state_dict: "encoder.0.weight", "encoder.0.bias", "encoder.2.weight", "encoder.2.bias", "encoder.3.weight", "encoder.3.bias", "encoder.3.running_mean", "encoder.3.running_var", "encoder.5.weight", "encoder.5.bias", "encoder.6.weight", "encoder.6.bias", "encoder.6.running_mean", "encoder.6.running_var",...并且载入的模型为:class ContextEncoder(nn.Module): def init(self): super(ContextEncoder, self).init() # 编码器 self.encoder = nn.Sequential( nn.Conv2d(4, 64, kernel_size=4, stride=2, padding=1), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(64, 128, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(128), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(128, 256, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(256), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(256, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), nn.Conv2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2, inplace=True), ) # 解码器 self.decoder = nn.Sequential( nn.ConvTranspose2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.ReLU(inplace=True), nn.ConvTranspose2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.ReLU(inplace=True), nn.ConvTranspose2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.ReLU(inplace=True), nn.ConvTranspose2d(512, 512, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(512), nn.ReLU(inplace=True), nn.ConvTranspose2d(512, 256, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(256), nn.ReLU(inplace=True), nn.ConvTranspose2d(256, 128, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(128), nn.ReLU(inplace=True), nn.ConvTranspose2d(128, 64, kernel_size=4, stride=2, padding=1), nn.BatchNorm2d(64), nn.ReLU(inplace=True), nn.ConvTranspose2d(64, 3, kernel_size=4, stride=2, padding=1), nn.Sigmoid(), ) def forward(self, x): x = self.encoder(x) x = self.decoder(x) return x 要怎么改

2023-05-11 上传

class Generator(nn.Module): def __init__(self): super(Generator, self).__init__() self.encoder = nn.Sequential( nn.Conv2d(6, 64, 3, stride=2, padding=1), nn.BatchNorm2d(64), nn.LeakyReLU(0.2), nn.Conv2d(64, 128, 3, stride=2, padding=1), nn.BatchNorm2d(128), nn.LeakyReLU(0.2), nn.Conv2d(128, 256, 3, stride=2, padding=1), nn.BatchNorm2d(256), nn.LeakyReLU(0.2), nn.Conv2d(256, 512, 3, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2), nn.Conv2d(512, 4000, 1), nn.BatchNorm2d(4000), nn.LeakyReLU(0.2) ) self.decoder = nn.Sequential( nn.ConvTranspose2d(4000, 512, 3, stride=2, padding=1, output_padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2), nn.ConvTranspose2d(512, 256, 3, stride=2, padding=1, output_padding=1), nn.BatchNorm2d(256), nn.LeakyReLU(0.2), nn.ConvTranspose2d(256, 128, 3, stride=2, padding=1, output_padding=1), nn.BatchNorm2d(128), nn.LeakyReLU(0.2), nn.ConvTranspose2d(128, 64, 3, stride=2, padding=1, output_padding=1), nn.BatchNorm2d(64), nn.LeakyReLU(0.2), nn.ConvTranspose2d(64, 3, 3, stride=1, padding=1), nn.Tanh() ) def forward(self, x1, x2): x = torch.cat([x1, x2], dim=1) x = self.encoder(x) x = self.decoder(x) return x class Discriminator(nn.Module): def __init__(self): super(Discriminator, self).__init__() self.conv = nn.Sequential( nn.Conv2d(3, 64, 4, stride=2, padding=1), nn.BatchNorm2d(64), nn.LeakyReLU(0.2), nn.Conv2d(64, 128, 4, stride=2, padding=1), nn.BatchNorm2d(128), nn.LeakyReLU(0.2), nn.Conv2d(128, 256, 4, stride=2, padding=1), nn.BatchNorm2d(256), nn.LeakyReLU(0.2), nn.Conv2d(256, 512, 4, stride=2, padding=1), nn.BatchNorm2d(512), nn.LeakyReLU(0.2), nn.Conv2d(512, 1, 4, stride=1), nn.Sigmoid() ) def forward(self, x): x = self.conv(x) return x 上述网络结构是什么GAN

2023-05-18 上传