self.downsample = nn.Sequential()

时间: 2023-11-12 07:47:29 浏览: 47
self.downsample = nn.Sequential()是在ResNet网络中的_make_layer函数中的一个初始化操作。它用于创建一个空的Sequential容器来存储降采样操作的相关层。在代码中,如果stride不等于1或者输入维度不等于输出维度乘以block.expansion(在这里是planes * block.expansion),则会为downsample赋值一个包含卷积层和批归一化层的Sequential容器。但是在这个特定的引用中,downsample没有赋予任何层,因此是一个空的Sequential容器。
相关问题

self.net = nn.Sequential(self.conv1, self.chomp1, self.relu1, self.dropout1, self.conv2, self.chomp2, self.relu2, self.dropout2) self.downsample = nn.Conv1d(n_inputs, n_outputs, 1) if n_inputs != n_outputs else None self.relu = nn.ReLU() self.init_weights()每句话什么意思

这是一个PyTorch的卷积神经网络模型的定义。具体解释如下: 1. self.net = nn.Sequential(self.conv1, self.chomp1, self.relu1, self.dropout1, self.conv2, self.chomp2, self.relu2, self.dropout2) 这一行代码定义了一个顺序容器,其中包含了两个卷积层、两个Chomp1d层、两个ReLU激活函数层和两个Dropout层。这些层按照顺序被堆叠在一起,构成了整个网络模型。 2. self.downsample = nn.Conv1d(n_inputs, n_outputs, 1) if n_inputs != n_outputs else None 这一行代码定义了一个1x1卷积层(也称为逐点卷积层),用于在残差连接中进行下采样。如果输入和输出的通道数相同,则不需要下采样,此时downsample为None。 3. self.relu = nn.ReLU() 这一行代码定义了一个ReLU激活函数层,用于将残差连接的输出进行非线性变换。 4. self.init_weights() 这一行代码调用了一个函数,用于初始化模型的权重。该函数的具体实现可以在后续代码中找到。

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

这段代码定义了一个 ResNet 类,继承自 nn.Module 类。ResNet 是一个深度卷积神经网络模型,用于图像分类任务。下面是对代码注释的解释: - class ResNet(nn.Module): 定义了一个 ResNet 类,继承自 nn.Module 类。 - def init(self, block, blocks_num, num_classes=1000, include_top=True): ResNet 类的初始化函数,接受 block、blocks_num、num_classes 和 include_top 四个参数。其中,block 是 ResNet 中的基础模块,blocks_num 是每层中包含的基础模块数量,num_classes 是输出的分类数目,include_top 表示是否包含全连接层。 - super(ResNet, self).init() 调用父类的初始化函数。 - self.include_top = include_top 设置 include_top 属性。 - self.in_channel = 64 设置输入通道数为 64。 - self.conv1 = nn.Conv2d(3, self.in_channel, kernel_size=7, stride=2, padding=3, bias=False) 定义第一个卷积层,输入通道数为 3,输出通道数为 self.in_channel,卷积核大小为 7x7,步长为 2,填充为 3,不使用偏置。 - self.bn1 = nn.BatchNorm2d(self.in_channel) 定义第一个 BatchNorm2d 层,对输入进行批量归一化。 - self.relu = nn.ReLU(inplace=True) 定义 ReLU 激活函数。 - self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1) 定义最大池化层,池化核大小为 3x3,步长为 2,填充为 1。 - self.layer1 = self._make_layer(block, 64, blocks_num[0]) 定义 ResNet 中的第一个残差块,包含 blocks_num[0] 个基础模块,每个基础模块的输出通道数为 64。 - self.layer2 = self._make_layer(block, 128, blocks_num[1], stride=2) 定义 ResNet 中的第二个残差块,包含 blocks_num[1] 个基础模块,每个基础模块的输出通道数为 128,步长为 2。 - self.layer3 = self._make_layer(block, 256, blocks_num[2], stride=2) 定义 ResNet 中的第三个残差块,包含 blocks_num[2] 个基础模块,每个基础模块的输出通道数为 256,步长为 2。 - self.layer4 = self.make_layer(block, 512, blocks_num[3], stride=2) 定义 ResNet 中的第四个残差块,包含 blocks_num[3] 个基础模块,每个基础模块的输出通道数为 512,步长为 2。 - if self.include_top: self.avgpool = nn.AdaptiveAvgPool2d((1, 1)) 定义自适应平均池化层,输出大小为 (1, 1)。 - self.fc = nn.Linear(512 * block.expansion, num_classes) 定义全连接层,将输入展平后,输出大小为 num_classes。 - for m in self.modules(): if isinstance(m, nn.Conv2d): nn.init.kaiming_normal(m.weight, mode='fan_out', nonlinearity='relu') 对 ResNet 中所有的卷积层进行权重初始化。 - def _make_layer(self, block, channel, block_num, stride=1): 定义私有函数 _make_layer,用于构建残差块。 - downsample = None 初始化 downsample 变量。 - if stride != 1 or self.in_channel != channel * block.expansion: 如果步长不为 1 或者输入通道数不等于 channel * block.expansion,则进行下采样操作。 - downsample = nn.Sequential( nn.Conv2d(self.in_channel, channel * block.expansion, kernel_size=1, stride=stride, bias=False), nn.BatchNorm2d(channel * block.expansion)) 定义下采样层,包含一个卷积层和一个 BatchNorm2d 层。 - layers = [] 初始化 layers 列表。 - layers.append(block(self.in_channel, channel, downsample=downsample, stride=stride)) 将第一个基础模块加入到 layers 列表中。 - self.in_channel = channel * block.expansion 更新输入通道数。 - for _ in range(1, block_num): layers.append(block(self.in_channel, channel)) 构建剩余的基础模块,添加到 layers 列表中。 - return nn.Sequential(*layers) 将 layers 列表中的基础模块打包成一个 Sequential 层,并返回。 - def forward(self, x): 定义前向传播函数。 - x = self.conv1(x) 进行第一个卷积操作。 - x = self.bn1(x) 进行第一个 BatchNorm2d 操作。 - x = self.relu(x) 进行 ReLU 激活操作。 - x = self.maxpool(x) 进行最大池化操作。 - x = self.layer1(x) 进行第一个残差块操作。 - x = self.layer2(x) 进行第二个残差块操作。 - x = self.layer3(x) 进行第三个残差块操作。 - x = self.layer4(x) 进行第四个残差块操作。 - if self.include_top: x = self.avgpool(x) 进行自适应平均池化操作。 - x = torch.flatten(x, 1) 将输出展平。 - x = self.fc(x) 进行全连接层操作,输出分类结果。 - return x 返回分类结果。

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代码解析: class BasicBlock(nn.Layer): expansion = 1 def init(self, in_channels, channels, stride=1, downsample=None): super().init() self.conv1 = conv1x1(in_channels, channels) self.bn1 = nn.BatchNorm2D(channels) self.relu = nn.ReLU() self.conv2 = conv3x3(channels, channels, stride) self.bn2 = nn.BatchNorm2D(channels) self.downsample = downsample self.stride = stride def forward(self, x): residual = x out = self.conv1(x) out = self.bn1(out) out = self.relu(out) out = self.conv2(out) out = self.bn2(out) if self.downsample is not None: residual = self.downsample(x) out += residual out = self.relu(out) return out class ResNet45(nn.Layer): def init(self, in_channels=3, block=BasicBlock, layers=[3, 4, 6, 6, 3], strides=[2, 1, 2, 1, 1]): self.inplanes = 32 super(ResNet45, self).init() self.conv1 = nn.Conv2D( in_channels, 32, kernel_size=3, stride=1, padding=1, weight_attr=ParamAttr(initializer=KaimingNormal()), bias_attr=False) self.bn1 = nn.BatchNorm2D(32) self.relu = nn.ReLU() self.layer1 = self._make_layer(block, 32, layers[0], stride=strides[0]) self.layer2 = self._make_layer(block, 64, layers[1], stride=strides[1]) self.layer3 = self._make_layer(block, 128, layers[2], stride=strides[2]) self.layer4 = self._make_layer(block, 256, layers[3], stride=strides[3]) self.layer5 = self._make_layer(block, 512, layers[4], stride=strides[4]) self.out_channels = 512 def _make_layer(self, block, planes, blocks, stride=1): downsample = None if stride != 1 or self.inplanes != planes * block.expansion: # downsample = True downsample = nn.Sequential( nn.Conv2D( self.inplanes, planes * block.expansion, kernel_size=1, stride=stride, weight_attr=ParamAttr(initializer=KaimingNormal()), bias_attr=False), nn.BatchNorm2D(planes * block.expansion), ) layers = [] layers.append(block(self.inplanes, planes, stride, downsample)) self.inplanes = planes * block.expansion for i in range(1, blocks): layers.append(block(self.inplanes, planes)) return nn.Sequential(*layers) def forward(self, x): x = self.conv1(x) x = self.bn1(x) x = self.relu(x) x = self.layer1(x) x = self.layer2(x) x = self.layer3(x) x = self.layer4(x) x = self.layer5(x) return x

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

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

class HorNet(nn.Module): # HorNet # hornet by iscyy/yoloair def __init__(self, index, in_chans, depths, dim_base, drop_path_rate=0.,layer_scale_init_value=1e-6, gnconv=[ partial(gnconv, order=2, s=1.0/3.0), partial(gnconv, order=3, s=1.0/3.0), partial(gnconv, order=4, s=1.0/3.0), partial(gnconv, order=5, s=1.0/3.0), # GlobalLocalFilter ], ): super().__init__() dims = [dim_base, dim_base * 2, dim_base * 4, dim_base * 8] self.index = index self.downsample_layers = nn.ModuleList() # stem and 3 intermediate downsampling conv layers hornet by iscyy/air stem = nn.Sequential( nn.Conv2d(in_chans, dims[0], kernel_size=4, stride=4), HorLayerNorm(dims[0], eps=1e-6, data_format="channels_first") ) self.downsample_layers.append(stem) for i in range(3): downsample_layer = nn.Sequential( HorLayerNorm(dims[i], eps=1e-6, data_format="channels_first"), nn.Conv2d(dims[i], dims[i+1], kernel_size=2, stride=2), ) self.downsample_layers.append(downsample_layer) self.stages = nn.ModuleList() # 4 feature resolution stages, each consisting of multiples bind residual blocks dummy dp_rates=[x.item() for x in torch.linspace(0, drop_path_rate, sum(depths))] if not isinstance(gnconv, list): gnconv = [gnconv, gnconv, gnconv, gnconv] else: gnconv = gnconv assert len(gnconv) == 4 cur = 0 for i in range(4): stage = nn.Sequential( *[HorBlock(dim=dims[i], drop_path=dp_rates[cur + j], layer_scale_init_value=layer_scale_init_value, gnconv=gnconv[i]) for j in range(depths[i])]# hornet by iscyy/air ) self.stages.append(stage) cur += depths[i] self.apply(self._init_weights) def _init_weights(self, m): if isinstance(m, (nn.Conv2d, nn.Linear)): nn.init.trunc_normal_(m.weight, std=.02) nn.init.constant_(m.bias, 0) def forward(self, x): x = self.downsample_layers[self.index](x) x = self.stages[self.index](x) return x

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