self.layers=torch.nn.Sequential(layerDict)什么意思

时间: 2023-11-12 17:08:12 浏览: 278
`self.layers` 是一个 `torch.nn.Sequential` 类型的对象,它由一个字典 `layerDict` 中的层按照顺序排列而成。`torch.nn.Sequential` 是一个容器,可以将多个层按照一定顺序组合成一个神经网络模型。在这个容器中,每个层的输出都作为下一个层的输入。 字典 `layerDict` 中的键是每个层的名称,值是对应层的实例化对象。例如,我们可以定义一个字典 `layerDict` 如下: ``` layerDict = { 'conv1': torch.nn.Conv2d(in_channels=3, out_channels=16, kernel_size=3, stride=1, padding=1), 'relu1': torch.nn.ReLU(), 'conv2': torch.nn.Conv2d(in_channels=16, out_channels=32, kernel_size=3, stride=1, padding=1), 'relu2': torch.nn.ReLU(), 'maxpool': torch.nn.MaxPool2d(kernel_size=2, stride=2), 'flatten': torch.nn.Flatten(), 'fc1': torch.nn.Linear(32 * 8 * 8, 512), 'relu3': torch.nn.ReLU(), 'fc2': torch.nn.Linear(512, 10), 'softmax': torch.nn.Softmax(dim=1) } ``` 这个字典定义了一个卷积神经网络的结构,包括两个卷积层、两个ReLU激活函数、一个最大池化层、一个展平层、两个全连接层和一个Softmax层。 然后,我们可以将这个字典传递给 `torch.nn.Sequential`,并将其赋值给 `self.layers`,以构建一个完整的神经网络模型: ``` self.layers = torch.nn.Sequential(layerDict) ```
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class ResidualBlock(nn.Module): def init(self, in_channels, out_channels, dilation): super(ResidualBlock, self).init() self.conv = nn.Sequential( nn.Conv1d(in_channels, out_channels, kernel_size=3, padding=dilation, dilation=dilation), nn.BatchNorm1d(out_channels), nn.ReLU(), nn.Conv1d(out_channels, out_channels, kernel_size=3, padding=dilation, dilation=dilation), nn.BatchNorm1d(out_channels), nn.ReLU() ) self.attention = nn.Sequential( nn.Conv1d(out_channels, out_channels, kernel_size=1), nn.Sigmoid() ) self.downsample = nn.Conv1d(in_channels, out_channels, kernel_size=1) if in_channels != out_channels else None def forward(self, x): residual = x out = self.conv(x) attention = self.attention(out) out = out * attention if self.downsample: residual = self.downsample(residual) out += residual return out class VMD_TCN(nn.Module): def init(self, input_size, output_size, n_k=1, num_channels=16, dropout=0.2): super(VMD_TCN, self).init() self.input_size = input_size self.nk = n_k if isinstance(num_channels, int): num_channels = [num_channels*(2**i) for i in range(4)] self.layers = nn.ModuleList() self.layers.append(nn.utils.weight_norm(nn.Conv1d(input_size, num_channels[0], kernel_size=1))) for i in range(len(num_channels)): dilation_size = 2 ** i in_channels = num_channels[i-1] if i > 0 else num_channels[0] out_channels = num_channels[i] self.layers.append(ResidualBlock(in_channels, out_channels, dilation_size)) self.pool = nn.AdaptiveMaxPool1d(1) self.fc = nn.Linear(num_channels[-1], output_size) self.w = nn.Sequential(nn.Conv1d(num_channels[-1], num_channels[-1], kernel_size=1), nn.Sigmoid()) # 特征融合 门控系统 # self.fc1 = nn.Linear(output_size * (n_k + 1), output_size) # 全部融合 self.fc1 = nn.Linear(output_size * 2, output_size) # 只选择其中两个融合 self.dropout = nn.Dropout(dropout) # self.weight_fc = nn.Linear(num_channels[-1] * (n_k + 1), n_k + 1) # 置信度系数,对各个结果加权平均 软投票思路 def vmd(self, x): x_imfs = [] signal = np.array(x).flatten() # flatten()必须加上 否则最后一个batch报错size不匹配! u, u_hat, omega = VMD(signal, alpha=512, tau=0, K=self.nk, DC=0, init=1, tol=1e-7) for i in range(u.shape[0]): imf = torch.tensor(u[i], dtype=torch.float32) imf = imf.reshape(-1, 1, self.input_size) x_imfs.append(imf) x_imfs.append(x) return x_imfs def forward(self, x): x_imfs = self.vmd(x) total_out = [] # for data in x_imfs: for data in [x_imfs[0], x_imfs[-1]]: out = data.transpose(1, 2) for layer in self.layers: out = layer(out) out = self.pool(out) # torch.Size([96, 56, 1]) w = self.w(out) out = w * out # torch.Size([96, 56, 1]) out = out.view(out.size(0), -1) out = self.dropout(out) out = self.fc(out) total_out.append(out) total_out = torch.cat(total_out, dim=1) # 考虑w1total_out[0]+ w2total_out[1],在第一维,权重相加得到最终结果,不用cat total_out = self.dropout(total_out) output = self.fc1(total_out) return output优化代码

class NLayerDiscriminator(nn.Module): def init(self, input_nc=3, ndf=64, n_layers=3, norm_layer=nn.BatchNorm2d, use_sigmoid=False, use_parallel=True): super(NLayerDiscriminator, self).init() self.use_parallel = use_parallel if type(norm_layer) == functools.partial: use_bias = norm_layer.func == nn.InstanceNorm2d else: use_bias = norm_layer == nn.InstanceNorm2d self.conv1 = nn.Conv2d(input_nc, ndf, kernel_size=3, padding=1) self.conv_offset1 = nn.Conv2d(input_nc, 18, kernel_size=3, stride=1, padding=1) init_offset1 = torch.Tensor(np.zeros([18, input_nc, 3, 3])) self.conv_offset1.weight = torch.nn.Parameter(init_offset1) # 初始化为0 self.conv_mask1 = nn.Conv2d(input_nc, 9, kernel_size=3, stride=1, padding=1) init_mask1 = torch.Tensor(np.zeros([9, input_nc, 3, 3]) + np.array([0.5])) self.conv_mask1.weight = torch.nn.Parameter(init_mask1) # 初始化为0.5 kw = 4 padw = int(np.ceil((kw-1)/2)) nf_mult = 1 for n in range(1, n_layers): nf_mult_prev = nf_mult nf_mult = min(2n, 8) self.sequence = [ nn.Conv2d(ndf * nf_mult_prev, ndf * nf_mult, kernel_size=kw, stride=2, padding=padw, bias=use_bias), norm_layer(ndf * nf_mult), nn.LeakyReLU(0.2, True) ] nf_mult_prev = nf_mult nf_mult = min(2n_layers, 8) self.sequence += [ nn.Conv2d(ndf * nf_mult_prev, ndf * nf_mult, kernel_size=kw, stride=1, padding=padw, bias=use_bias), norm_layer(ndf * nf_mult), nn.LeakyReLU(0.2, True) ] self.sequence += [nn.Conv2d(ndf * nf_mult, 1, kernel_size=kw, stride=1, padding=padw)] if use_sigmoid: self.sequence += [nn.Sigmoid()] def forward(self, input): offset1 = self.conv_offset1(input) mask1 = torch.sigmoid(self.conv_mask1(input)) sequence1 = [ torchvision.ops.deform_conv2d(input=input, offset=offset1, weight=self.conv1.weight, mask=mask1, padding=(1, 1)) ] sequence = sequence1 + self.sequence self.model = nn.Sequential(*sequence) return self.model(input),上述代码出现问题:TypeError: torch.cuda.FloatTensor is not a Module subclass,如何修改

为以下的每句代码做注释:class ResNet(nn.Module): def init(self, block, blocks_num, num_classes=1000, include_top=True): super(ResNet, self).init() self.include_top = include_top self.in_channel = 64 self.conv1 = nn.Conv2d(3, self.in_channel, kernel_size=7, stride=2, padding=3, bias=False) self.bn1 = nn.BatchNorm2d(self.in_channel) self.relu = nn.ReLU(inplace=True) self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1) self.layer1 = self._make_layer(block, 64, blocks_num[0]) self.layer2 = self._make_layer(block, 128, blocks_num[1], stride=2) self.layer3 = self._make_layer(block, 256, blocks_num[2], stride=2) self.layer4 = self.make_layer(block, 512, blocks_num[3], stride=2) if self.include_top: self.avgpool = nn.AdaptiveAvgPool2d((1, 1)) # output size = (1, 1) self.fc = nn.Linear(512 * block.expansion, num_classes) for m in self.modules(): if isinstance(m, nn.Conv2d): nn.init.kaiming_normal(m.weight, mode='fan_out', nonlinearity='relu') def _make_layer(self, block, channel, block_num, stride=1): downsample = None if stride != 1 or self.in_channel != channel * block.expansion: downsample = nn.Sequential( nn.Conv2d(self.in_channel, channel * block.expansion, kernel_size=1, stride=stride, bias=False), nn.BatchNorm2d(channel * block.expansion)) layers = [] layers.append(block(self.in_channel, channel, downsample=downsample, stride=stride)) self.in_channel = channel * block.expansion for _ in range(1, block_num): layers.append(block(self.in_channel, channel)) return nn.Sequential(*layers) def forward(self, x): x = self.conv1(x) x = self.bn1(x) x = self.relu(x) x = self.maxpool(x) x = self.layer1(x) x = self.layer2(x) x = self.layer3(x) x = self.layer4(x) if self.include_top: x = self.avgpool(x) x = torch.flatten(x, 1) x = self.fc(x) return x

class BasicBlock2D(nn.Module): expansion = 1 def __init__(self, in_channels, out_channels, stride=1): super(BasicBlock2D, self).__init__() self.conv1 = nn.Conv2d(in_channels, out_channels, kernel_size=3, stride=stride, padding=1, bias=False) self.bn1 = nn.BatchNorm2d(out_channels) self.conv2 = nn.Conv2d(out_channels, out_channels, kernel_size=3, stride=1, padding=1, bias=False) self.bn2 = nn.BatchNorm2d(out_channels) self.shortcut = nn.Sequential() if stride != 1 or in_channels != self.expansion * out_channels: self.shortcut = nn.Sequential( nn.Conv2d(in_channels, self.expansion * out_channels, kernel_size=1, stride=stride, bias=False), nn.BatchNorm2d(self.expansion * out_channels) ) def forward(self, x): out = F.relu(self.bn1(self.conv1(x))) out = self.bn2(self.conv2(out)) out += self.shortcut(x) out = F.relu(out) return out # 定义二维ResNet-18模型 class ResNet18_2D(nn.Module): def __init__(self, num_classes=1000): super(ResNet18_2D, self).__init__() self.in_channels = 64 self.conv1 = nn.Conv2d(1, 64, kernel_size=7, stride=2, padding=3, bias=False) self.bn1 = nn.BatchNorm2d(64) self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1) self.layer1 = self._make_layer(BasicBlock2D, 64, 2, stride=1) self.layer2 = self._make_layer(BasicBlock2D, 128, 2, stride=2) self.layer3 = self._make_layer(BasicBlock2D, 256, 2, stride=2) self.layer4 = self._make_layer(BasicBlock2D, 512, 2, stride=2) self.avgpool = nn.AdaptiveAvgPool2d((1, 1)) self.fc = nn.Linear(512 , 512) def _make_layer(self, block, out_channels, num_blocks, stride): layers = [] layers.append(block(self.in_channels, out_channels, stride)) self.in_channels = out_channels * block.expansion for _ in range(1, num_blocks): layers.append(block(self.in_channels, out_channels)) return nn.Sequential(*layers) def forward(self, x): out = F.relu(self.bn1(self.conv1(x))) out = self.maxpool(out) out = self.layer1(out) out = self.layer2(out) out = self.layer3(out) out = self.layer4(out) out = self.avgpool(out) # print(out.shape) out = out.view(out.size(0), -1) out = self.fc(out) return out改为用稀疏表示替换全连接层

from collections import OrderedDict import torch import torch.nn.functional as F import torchvision from torch import nn import models.vgg_ as models class BackboneBase_VGG(nn.Module): def __init__(self, backbone: nn.Module, num_channels: int, name: str, return_interm_layers: bool): super().__init__() features = list(backbone.features.children()) if return_interm_layers: if name == 'vgg16_bn': self.body1 = nn.Sequential(*features[:13]) self.body2 = nn.Sequential(*features[13:23]) self.body3 = nn.Sequential(*features[23:33]) self.body4 = nn.Sequential(*features[33:43]) else: self.body1 = nn.Sequential(*features[:9]) self.body2 = nn.Sequential(*features[9:16]) self.body3 = nn.Sequential(*features[16:23]) self.body4 = nn.Sequential(*features[23:30]) else: if name == 'vgg16_bn': self.body = nn.Sequential(*features[:44]) # 16x down-sample elif name == 'vgg16': self.body = nn.Sequential(*features[:30]) # 16x down-sample self.num_channels = num_channels self.return_interm_layers = return_interm_layers def forward(self, tensor_list): out = [] if self.return_interm_layers: xs = tensor_list for _, layer in enumerate([self.body1, self.body2, self.body3, self.body4]): xs = layer(xs) out.append(xs) else: xs = self.body(tensor_list) out.append(xs) return out class Backbone_VGG(BackboneBase_VGG): """ResNet backbone with frozen BatchNorm.""" def __init__(self, name: str, return_interm_layers: bool): if name == 'vgg16_bn': backbone = models.vgg16_bn(pretrained=True) elif name == 'vgg16': backbone = models.vgg16(pretrained=True) num_channels = 256 super().__init__(backbone, num_channels, name, return_interm_layers) def build_backbone(args): backbone = Backbone_VGG(args.backbone, True) return backbone if __name__ == '__main__': Backbone_VGG('vgg16', True)

# New module: utils.pyimport torchfrom torch import nnclass ConvBlock(nn.Module): """A convolutional block consisting of a convolution layer, batch normalization layer, and ReLU activation.""" def __init__(self, in_chans, out_chans, drop_prob): super().__init__() self.conv = nn.Conv2d(in_chans, out_chans, kernel_size=3, padding=1) self.bn = nn.BatchNorm2d(out_chans) self.relu = nn.ReLU(inplace=True) self.dropout = nn.Dropout2d(p=drop_prob) def forward(self, x): x = self.conv(x) x = self.bn(x) x = self.relu(x) x = self.dropout(x) return x# Refactored U-Net modelfrom torch import nnfrom utils import ConvBlockclass UnetModel(nn.Module): """PyTorch implementation of a U-Net model.""" def __init__(self, in_chans, out_chans, chans, num_pool_layers, drop_prob, pu_args=None): super().__init__() PUPS.__init__(self, *pu_args) self.in_chans = in_chans self.out_chans = out_chans self.chans = chans self.num_pool_layers = num_pool_layers self.drop_prob = drop_prob # Calculate input and output channels for each ConvBlock ch_list = [chans] + [chans * 2 ** i for i in range(num_pool_layers - 1)] in_chans_list = [in_chans] + [ch_list[i] for i in range(num_pool_layers - 1)] out_chans_list = ch_list[::-1] # Create down-sampling layers self.down_sample_layers = nn.ModuleList() for i in range(num_pool_layers): self.down_sample_layers.append(ConvBlock(in_chans_list[i], out_chans_list[i], drop_prob)) # Create up-sampling layers self.up_sample_layers = nn.ModuleList() for i in range(num_pool_layers - 1): self.up_sample_layers.append(ConvBlock(out_chans_list[i], out_chans_list[i + 1] // 2, drop_prob)) self.up_sample_layers.append(ConvBlock(out_chans_list[-1], out_chans_list[-1], drop_prob)) # Create final convolution layer self.conv2 = nn.Sequential( nn.Conv2d(out_chans_list[-1], out_chans_list[-1] // 2, kernel_size=1), nn.Conv2d(out_chans_list[-1] // 2, out_chans, kernel_size=1), nn.Conv2d(out_chans, out_chans, kernel_size=1), ) def forward(self, x): # Down-sampling path encoder_outs = [] for layer in self.down_sample_layers: x = layer(x) encoder_outs.append(x) x = nn.MaxPool2d(kernel_size=2)(x) # Bottom layer x = self.conv(x) # Up-sampling path for i, layer in enumerate(self.up_sample_layers): x = nn.functional.interpolate(x, scale_factor=2, mode='bilinear', align_corners=True) x = torch.cat([x, encoder_outs[-(i + 1)]], dim=1) x = layer(x) # Final convolution layer x = self.conv2(x) return x

import torch import torch.nn as nn import torch.nn.functional as F from torch.autograd import Variable class Bottleneck(nn.Module): def init(self, last_planes, in_planes, out_planes, dense_depth, stride, first_layer): super(Bottleneck, self).init() self.out_planes = out_planes self.dense_depth = dense_depth self.conv1 = nn.Conv2d(last_planes, in_planes, kernel_size=1, bias=False) self.bn1 = nn.BatchNorm2d(in_planes) self.conv2 = nn.Conv2d(in_planes, in_planes, kernel_size=3, stride=stride, padding=1, groups=32, bias=False) self.bn2 = nn.BatchNorm2d(in_planes) self.conv3 = nn.Conv2d(in_planes, out_planes+dense_depth, kernel_size=1, bias=False) self.bn3 = nn.BatchNorm2d(out_planes+dense_depth) self.shortcut = nn.Sequential() if first_layer: self.shortcut = nn.Sequential( nn.Conv2d(last_planes, out_planes+dense_depth, kernel_size=1, stride=stride, bias=False), nn.BatchNorm2d(out_planes+dense_depth) ) def forward(self, x): out = F.relu(self.bn1(self.conv1(x))) out = F.relu(self.bn2(self.conv2(out))) out = self.bn3(self.conv3(out)) x = self.shortcut(x) d = self.out_planes out = torch.cat([x[:,:d,:,:]+out[:,:d,:,:], x[:,d:,:,:], out[:,d:,:,:]], 1) out = F.relu(out) return out class DPN(nn.Module): def init(self, cfg): super(DPN, self).init() in_planes, out_planes = cfg['in_planes'], cfg['out_planes'] num_blocks, dense_depth = cfg['num_blocks'], cfg['dense_depth'] self.conv1 = nn.Conv2d(3, 64, kernel_size=3, stride=1, padding=1, bias=False) self.bn1 = nn.BatchNorm2d(64) self.last_planes = 64 self.layer1 = self._make_layer(in_planes[0], out_planes[0], num_blocks[0], dense_depth[0], stride=1) self.layer2 = self._make_layer(in_planes[1], out_planes[1], num_blocks[1], dense_depth[1], stride=2) self.layer3 = self._make_layer(in_planes[2], out_planes[2], num_blocks[2], dense_depth[2], stride=2) self.layer4 = self._make_layer(in_planes[3], out_planes[3], num_blocks[3], dense_depth[3], stride=2) self.linear = nn.Linear(out_planes[3]+(num_blocks[3]+1)dense_depth[3], 10) def _make_layer(self, in_planes, out_planes, num_blocks, dense_depth, stride): strides = [stride] + 1 layers = [] for i,stride in (strides): layers.append(Bottleneck(self.last_planes, in_planes, out_planes, dense_depth, stride, i==0)) self.last_planes = out_planes + (i+2) * dense_depth return nn.Sequential(*layers) def forward(self, x): out = F.relu(self.bn1(self.conv1(x))) out = self.layer1(out) out = self.layer2(out) out = self.layer3(out) out = self.layer4(out) out = F.avg_pool2d(out, 4) out = out.view(out.size(0), -1) out = self.linear(out) return out def DPN92(): cfg = { 'in_planes': (96,192,384,768), 'out_planes': (256,512,1024,2048), 'num_blocks': (3,4,20,3), 'dense_depth': (16,32,24,128) } return DPN(cfg)基于这个程序改成对摄像头采集的图像检测与分类输出坐标、大小和种类

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