import torch.nn as nn num_classes = 131 class FruitsClassificationModel(nn.Module): def __init__(self): super(FruitsClassificationModel, self).__init__() self.layer1 = nn.Sequential( nn.Conv2d(in_channels=3, out_channels=32, kernel_size=5, padding=2), nn.BatchNorm2d(num_features=32), nn.ReLU(), nn.MaxPool2d(kernel_size=2, stride=2)) self.layer2 = nn.Sequential( nn.Conv2d(in_channels=32, out_channels=64, kernel_size=5, padding=2), nn.BatchNorm2d(num_features=64), nn.ReLU(), nn.MaxPool2d(kernel_size=2, stride=2)) self.layer3 = nn.Sequential( nn.Conv2d(in_channels=64, out_channels=128, kernel_size=5, padding=2), nn.BatchNorm2d(num_features=128), nn.ReLU(), nn.MaxPool2d(kernel_size=2, stride=2)) self.fc = nn.Linear(in_features=18432, out_features=num_classes)

时间: 2023-11-22 07:04:56 浏览: 67
这段代码定义了一个卷积神经网络模型，用于水果图片的分类任务。该模型包含三个卷积层和一个全连接层，其中每个卷积层后面都跟着一个BatchNorm层和ReLU激活函数，然后是一个最大池化层，用于下采样。最后通过一个全连接层将卷积层输出的feature map映射到类别上。其中，输入图片是3通道的，输出类别数为131个。
相关问题

import torch import torch.nn as nn import torch.nn.functional as F import torchvision.models as models import os class FCNTransformerNet(nn.Module): def __init__(self, num_classes): super(FCNTransformerNet, self).__init__() self.fcn_backbone = models.segmentation.fcn_resnet50(pretrained=True).backbone self.fcn_backbone.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3, bias=False) self.transformer_layers = nn.TransformerEncoderLayer(d_model=2048, nhead=8) self.transformer_encoder = nn.TransformerEncoder(self.transformer_layers, num_layers=6) self.classification_head = nn.Sequential( nn.Linear(2048, 512), nn.ReLU(), nn.Linear(512, num_classes) ) def forward(self, x): fcn_output = self.fcn_backbone(x)['out'] fcn_output = fcn_output.view(fcn_output.size(0), fcn_output.size(1), -1) fcn_output = fcn_output.permute(2, 0, 1) transformer_output = self.transformer_encoder(fcn_output) transformer_output = transformer_output.permute(1, 2, 0) transformer_output = transformer_output.contiguous().view(transformer_output.size(0), -1, 1, 1) output = self.classification_head(transformer_output) return output FCNTransformerNet net = FCNTransformerNet(num_classes=2) input_batch = torch.randn(4, 3, 512, 512) output_batch = net(input_batch) print(output_batch.size()) # Should print: torch.Size([4, 2, 512, 512]) 运行这段代码，并改错

在这段代码中，有几个问题需要进行修正。 首先，你定义了一个名为 `FCNTransformerNet` 的类，但是没有在代码末尾实例化这个类。你需要添加 `()` 来实例化该类，将其赋值给变量 `net`。 其次，你需要将 `FCNTransformerNet` 类的定义放在 `if __name__ == "__main__":` 条件语句内部，以确保它只在主程序中运行，而不是在模块导入时运行。 最后，你的代码中缺少了一些必要的导入语句。你需要导入 `torch`, `torch.nn` 和 `torchvision.models`。 下面是修改后的代码： ```python import torch import torch.nn as nn import torchvision.models as models class FCNTransformerNet(nn.Module): def __init__(self, num_classes): super(FCNTransformerNet, self).__init__() self.fcn_backbone = models.segmentation.fcn_resnet50(pretrained=True).backbone self.fcn_backbone.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3, bias=False) self.transformer_layers = nn.TransformerEncoderLayer(d_model=2048, nhead=8) self.transformer_encoder = nn.TransformerEncoder(self.transformer_layers, num_layers=6) self.classification_head = nn.Sequential( nn.Linear(2048, 512), nn.ReLU(), nn.Linear(512, num_classes) ) def forward(self, x): fcn_output = self.fcn_backbone(x)['out'] fcn_output = fcn_output.view(fcn_output.size(0), fcn_output.size(1), -1) fcn_output = fcn_output.permute(2, 0, 1) transformer_output = self.transformer_encoder(fcn_output) transformer_output = transformer_output.permute(1, 2, 0) transformer_output = transformer_output.contiguous().view(transformer_output.size(0), -1, 1, 1) output = self.classification_head(transformer_output) return output if __name__ == "__main__": net = FCNTransformerNet(num_classes=2) input_batch = torch.randn(4, 3, 512, 512) output_batch = net(input_batch) print(output_batch.size()) # Should print: torch.Size([4, 2, 512, 512]) ``` 请注意，这段代码假设你已经正确安装了 `torch` 和 `torchvision` 库。如果出现任何错误，你可能需要检查这些库的安装情况。

下面的这段python代码，哪里有错误，修改一下：import numpy as np import matplotlib.pyplot as plt import pandas as pd import torch import torch.nn as nn from torch.autograd import Variable from sklearn.preprocessing import MinMaxScaler training_set = pd.read_csv('CX2-36_1971.csv') training_set = training_set.iloc[:, 1:2].values def sliding_windows(data, seq_length): x = [] y = [] for i in range(len(data) - seq_length): _x = data[i:(i + seq_length)] _y = data[i + seq_length] x.append(_x) y.append(_y) return np.array(x), np.array(y) sc = MinMaxScaler() training_data = sc.fit_transform(training_set) seq_length = 1 x, y = sliding_windows(training_data, seq_length) train_size = int(len(y) * 0.8) test_size = len(y) - train_size dataX = Variable(torch.Tensor(np.array(x))) dataY = Variable(torch.Tensor(np.array(y))) trainX = Variable(torch.Tensor(np.array(x[1:train_size]))) trainY = Variable(torch.Tensor(np.array(y[1:train_size]))) testX = Variable(torch.Tensor(np.array(x[train_size:len(x)]))) testY = Variable(torch.Tensor(np.array(y[train_size:len(y)]))) class LSTM(nn.Module): def __init__(self, num_classes, input_size, hidden_size, num_layers): super(LSTM, self).__init__() self.num_classes = num_classes self.num_layers = num_layers self.input_size = input_size self.hidden_size = hidden_size self.seq_length = seq_length self.lstm = nn.LSTM(input_size=input_size, hidden_size=hidden_size, num_layers=num_layers, batch_first=True) self.fc = nn.Linear(hidden_size, num_classes) def forward(self, x): h_0 = Variable(torch.zeros( self.num_layers, x.size(0), self.hidden_size)) c_0 = Variable(torch.zeros( self.num_layers, x.size(0), self.hidden_size)) # Propagate input through LSTM ula, (h_out, _) = self.lstm(x, (h_0, c_0)) h_out = h_out.view(-1, self.hidden_size) out = self.fc(h_out) return out num_epochs = 2000 learning_rate = 0.001 input_size = 1 hidden_size = 2 num_layers = 1 num_classes = 1 lstm = LSTM(num_classes, input_size, hidden_size, num_layers) criterion = torch.nn.MSELoss() # mean-squared error for regression optimizer = torch.optim.Adam(lstm.parameters(), lr=learning_rate) # optimizer = torch.optim.SGD(lstm.parameters(), lr=learning_rate) runn = 10 Y_predict = np.zeros((runn, len(dataY))) # Train the model for i in range(runn): print('Run: ' + str(i + 1)) for epoch in range(num_epochs): outputs = lstm(trainX) optimizer.zero_grad() # obtain the loss function loss = criterion(outputs, trainY) loss.backward() optimizer.step() if epoch % 100 == 0: print("Epoch: %d, loss: %1.5f" % (epoch, loss.item())) lstm.eval() train_predict = lstm(dataX) data_predict = train_predict.data.numpy() dataY_plot = dataY.data.numpy() data_predict = sc.inverse_transform(data_predict) dataY_plot = sc.inverse_transform(dataY_plot) Y_predict[i,:] = np.transpose(np.array(data_predict)) Y_Predict = np.mean(np.array(Y_predict)) Y_Predict_T = np.transpose(np.array(Y_Predict))

在这段代码中，可能存在以下错误： 1. 缺少必要的库或模块。 2. training_set 的文件路径是否正确。 3. training_set 的数据处理是否正确。 4. LSTM 模型的定义是否正确。 5. 训练和预测的代码是否正确。 下面是修改后的代码： ```python import numpy as np import matplotlib.pyplot as plt import pandas as pd import torch import torch.nn as nn from torch.autograd import Variable from sklearn.preprocessing import MinMaxScaler # 读取数据 training_set = pd.read_csv('CX2-36_1971.csv') training_set = training_set.iloc[:, 1:2].values # 定义数据处理函数 def sliding_windows(data, seq_length): x = [] y = [] for i in range(len(data) - seq_length): _x = data[i:(i + seq_length)] _y = data[i + seq_length] x.append(_x) y.append(_y) return np.array(x), np.array(y) # 对数据进行归一化处理 sc = MinMaxScaler() training_data = sc.fit_transform(training_set) # 定义窗口长度 seq_length = 1 # 对数据进行窗口划分 x, y = sliding_windows(training_data, seq_length) # 划分训练集和测试集 train_size = int(len(y) * 0.8) test_size = len(y) - train_size dataX = Variable(torch.Tensor(np.array(x))) dataY = Variable(torch.Tensor(np.array(y))) trainX = Variable(torch.Tensor(np.array(x[1:train_size]))) trainY = Variable(torch.Tensor(np.array(y[1:train_size]))) testX = Variable(torch.Tensor(np.array(x[train_size:len(x)]))) testY = Variable(torch.Tensor(np.array(y[train_size:len(y)]))) # 定义 LSTM 模型 class LSTM(nn.Module): def __init__(self, num_classes, input_size, hidden_size, num_layers): super(LSTM, self).__init__() self.num_classes = num_classes self.num_layers = num_layers self.input_size = input_size self.hidden_size = hidden_size self.seq_length = seq_length self.lstm = nn.LSTM(input_size=input_size, hidden_size=hidden_size, num_layers=num_layers, batch_first=True) self.fc = nn.Linear(hidden_size, num_classes) def forward(self, x): h_0 = Variable(torch.zeros( self.num_layers, x.size(0), self.hidden_size)) c_0 = Variable(torch.zeros( self.num_layers, x.size(0), self.hidden_size)) # Propagate input through LSTM ula, (h_out, _) = self.lstm(x, (h_0, c_0)) h_out = h_out.view(-1, self.hidden_size) out = self.fc(h_out) return out # 定义训练参数 num_epochs = 2000 learning_rate = 0.001 input_size = 1 hidden_size = 2 num_layers = 1 num_classes = 1 # 实例化 LSTM 模型 lstm = LSTM(num_classes, input_size, hidden_size, num_layers) # 定义损失函数和优化器 criterion = torch.nn.MSELoss() optimizer = torch.optim.Adam(lstm.parameters(), lr=learning_rate) # 训练模型 runn = 10 Y_predict = np.zeros((runn, len(dataY))) for i in range(runn): print('Run: ' + str(i + 1)) for epoch in range(num_epochs): outputs = lstm(trainX) optimizer.zero_grad() loss = criterion(outputs, trainY) loss.backward() optimizer.step() if epoch % 100 == 0: print("Epoch: %d, loss: %1.5f" % (epoch, loss.item())) lstm.eval() train_predict = lstm(dataX) data_predict = train_predict.data.numpy() dataY_plot = dataY.data.numpy() # 对结果进行反归一化 data_predict = sc.inverse_transform(data_predict) dataY_plot = sc.inverse_transform(dataY_plot) Y_predict[i,:] = np.transpose(np.array(data_predict)) Y_Predict = np.mean(Y_predict, axis=0) Y_Predict_T = np.transpose(np.array(Y_Predict)) ```

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LDAM损失函数pytorch代码如下：class LDAMLoss(nn.Module): def __init__(self, cls_num_list, max_m=0.5, weight=None, s=30): super(LDAMLoss, self).__init__() m_list = 1.0 / np.sqrt(np.sqrt(cls_num_list)) m_list = m_list * (max_m / np.max(m_list)) m_list = torch.cuda.FloatTensor(m_list) self.m_list = m_list assert s > 0 self.s = s if weight is not None: weight = torch.FloatTensor(weight).cuda() self.weight = weight self.cls_num_list = cls_num_list def forward(self, x, target): index = torch.zeros_like(x, dtype=torch.uint8) index_float = index.type(torch.cuda.FloatTensor) batch_m = torch.matmul(self.m_list[None, :], index_float.transpose(1,0)) # 0,1 batch_m = batch_m.view((16, 1)) # size=(batch_size, 1) (-1,1) x_m = x - batch_m output = torch.where(index, x_m, x) if self.weight is not None: output = output * self.weight[None, :] target = torch.flatten(target) # 将 target 转换成 1D Tensor logit = output * self.s return F.cross_entropy(logit, target, weight=self.weight) 模型部分参数如下：# 设置全局参数 model_lr = 1e-5 BATCH_SIZE = 16 EPOCHS = 50 DEVICE = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu') use_amp = True use_dp = True classes = 7 resume = None CLIP_GRAD = 5.0 Best_ACC = 0 #记录最高得分 use_ema=True model_ema_decay=0.9998 start_epoch=1 seed=1 seed_everything(seed) # 数据增强 mixup mixup_fn = Mixup( mixup_alpha=0.8, cutmix_alpha=1.0, cutmix_minmax=None, prob=0.1, switch_prob=0.5, mode='batch', label_smoothing=0.1, num_classes=classes) 帮我用pytorch实现模型在模型训练中使用LDAM损失函数

import torch.nn as nn import torch.optim as optim import torch.nn.functional as F from ldam_loss import LDAMLoss # 导入LDAM损失函数 # 定义模型 class MyModel(nn.Module): def __init__(self): super...

import torch import torch.nn as nn import torchvision.models as models class FCNTransformer(nn.Module): def __init__(self, num_classes): super(FCNTransformer, self).__init__() # Load pre-trained V16 model as FCN backbone vgg16 = models.vgg16(pretrained=True) features = list(vgg16.features.children()) self.backbone = nn.Sequential(*features) # FCN layers self.fcn_layers = nn.Sequential( nn.Conv2d(512, 4096, 7), nn.ReLU(inplace=True), nn.Dropout(), nn.Conv2d(4096, 4096, 1), nn.ReLU(inplace=True), nn.Dropout(), nn.Conv2d(4096, num_classes, 1) ) # Transformer layers self.transformer = nn.Transformer( d_model=512, nhead=8, num_encoder_layers=6, num_decoder_layers=6, dim_feedforward=2048, dropout=0.1 ) def forward(self,x): # Backbone feature extraction features = self.backbone(x) # FCN layers fcn_out = self.fcn_layers(features) # Reshaping output for transformer input b, c, h, w = fcn_out.size() fcn_out = fcn_out.squeeze().view(c, b, -1).permute(2, 0, 1) # Reshaping for transformer input # Transformer encoding transformer_out = self.transformer.encode(fcn_out) # Reshaping output for segmentation prediction transformer_out = transformer_out.permute(1, 2, 0).view(b, c, h, w) return transformer_out if __name__ == '__main__': a = torch.randn(1, 3, 512, 512) model = FCNTransformer(num_classes=2) print(model(a).shape) 改进这段代码

def __init__(self, num_classes): super(FCNTransformer, self).__init__() # Load pre-trained V16 model as FCN backbone vgg16 = models.vgg16(pretrained=True) features = list(vgg16.features.children...

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import torch.nn as nn import torch.optim as optim import torch.nn.functional as F from torchvision import datasets, transforms from ldam_loss import LDAMLoss # 假设你已经将 LDAM 损失函数的代码存放在 ...

import torch.nn as nnclass ViT(nn.Module): def __init__(self, img_size, patch_size, num_classes, dim): super().__init__() self.patch_size = patch_size num_patches = (img_size // patch_size) ** 2 patch_dim = 3 * patch_size ** 2 # 输入的通道数，3表示RGB通道 self.class_embed = nn.Parameter(torch.randn(1, 1, dim)) self.patch_embed = nn.Linear(patch_dim, dim) self.pos_embed = nn.Parameter(torch.randn(1, num_patches + 1, dim)) self.cls_token = nn.Parameter(torch.randn(1, 1, dim)) self.transformer = nn.TransformerEncoderLayer(d_model=dim, nhead=8) self.linear = nn.Linear(dim, num_classes) def forward(self, x): batch_size, _, _, _ = x.shape patches = x.unfold(2, self.patch_size, self.patch_size).unfold(3, self.patch_size, self.patch_size) patches = patches.flatten(2).transpose(1, 2) patch_embed = self.patch_embed(patches) pos_embed = self.pos_embed[:, :(patches.size(1) + 1)] cls_tokens = self.cls_token.expand(batch_size, -1, -1) x = torch.cat([cls_tokens, patch_embed], dim=1) x += pos_embed x = self.transformer(x) x = x.mean(dim=1) x = self.linear(x) return x

这段代码是用来定义一个名为ViT的类，其继承自nn.Module。其有四个参数，包括图像尺寸img_size、每个patch的尺寸patch_size、类别数目num_classes和维度dim。在初始化时，代码调用了父类的构造函数，并且将patch_...

import torch import os import torch.nn as nn import torch.optim as optim import numpy as np import random class Net(nn.Module): def init(self): super(Net, self).init() self.conv1 = nn.Conv2d(1, 16, kernel_size=3,stride=1) self.pool = nn.MaxPool2d(kernel_size=2,stride=2) self.conv2 = nn.Conv2d(16, 32, kernel_size=3,stride=1) self.fc1 = nn.Linear(32 * 9 * 9, 120) self.fc2 = nn.Linear(120, 84) self.fc3 = nn.Linear(84, 2) def forward(self, x): x = self.pool(nn.functional.relu(self.conv1(x))) x = self.pool(nn.functional.relu(self.conv2(x))) x = x.view(-1, 32 * 9 * 9) x = nn.functional.relu(self.fc1(x)) x = nn.functional.relu(self.fc2(x)) x = self.fc3(x) return x net = Net() criterion = nn.CrossEntropyLoss() optimizer = optim.SGD(net.parameters(), lr=0.001, momentum=0.9) folder_path = 'random_matrices2' # 创建空的tensor x = torch.empty((40, 1, 42, 42)) # 遍历文件夹内的文件，将每个矩阵转化为tensor并存储 for j in range(40): for j in range(40): file_name = 'matrix_{}.npy'.format(j) file_path = os.path.join(folder_path, file_name) matrix = np.load(file_path) x[j] = torch.from_numpy(matrix).unsqueeze(0) #y = torch.cat((torch.zeros(20), torch.ones(20))) y = torch.cat((torch.zeros(20, dtype=torch.long), torch.ones(20, dtype=torch.long))) for epoch in range(10): running_loss = 0.0 for i in range(40): inputs = x[i] labels = y[i] optimizer.zero_grad() outputs = net(inputs) #loss = criterion(outputs, labels) loss = criterion(outputs.unsqueeze(0), labels.unsqueeze(0)) loss.backward() optimizer.step() running_loss += loss.item() print('[%d] loss: %.3f' % (epoch + 1, running_loss / 40)) print('Finished Training') 上述代码报错：RuntimeError: Expected target size [1, 2], got [1]，怎么修改？

import torch.nn as nn import torch.optim as optim import numpy as np import random class Net(nn.Module): def __init__(self): super(Net, self).__init__() self.conv1 = nn.Conv2d(1, 16, kernel_size=3...

import cv2 import torch import torch.nn as nn import torchvision.models as models class FCNTransformer(nn.Module): def __init__(self, num_classes): super(FCNTransformer, self).__init__() # Load pre-trained FCN backbone fcn_backbone = models.segmentation.fcn_resnet50(pretrained=True) self.fcn = fcn_backbone.backbone # Create the transformer encoder self.transformer_encoder = nn.TransformerEncoderLayer(d_model=2048, nhead=8) # Output linear layer self.linear = nn.Linear(2048, num_classes) def forward(self, x): # Pass input through FCN backbone fcn_output = self.fcn(x)['out'] print(fcn_output.shape) x = fcn_output # Reshape output tensor for transformer # From (batch_size, channels, height, width) to (width * height, batch_size, channels) fcn_output = fcn_output.permute(0, 2, 3, 1).contiguous().view(-1, fcn_output.size(0), fcn_output.size(1)) print(fcn_output.shape) # Pass the reshaped tensor through transformer encoder transformed_output = self.transformer_encoder(fcn_output) print(transformed_output.shape) # Reshape output tensor back to (batch_size, channels, height, width) transformed_output = transformed_output.view(1, -1) print(transformed_output.shape) output = self.linear(transformed_output) return output if __name__ == '__main__': a = torch.randn(1, 3, 512, 512) model = FCNTransformer(num_classes=2) print(model(a).shape) # print(model) 改进这段代码

这段代码已经实现了一个FCNTransformer模型，它基于FCN网络和Transformer编码器。如果你想改进这段代码，可以考虑以下几点： 1. 数据处理：在输入图像之前，对图像进行预处理，例如缩放、裁剪或标准化。...

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

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....

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def __init__(self, cfg, num_classes): 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....

import dgl import numpy as np import torch import torch.nn as nn import dgl.function as fn # 生成10个节点和15条边的图 g = dgl.rand_graph(10, 15) # 为每个节点随机生成一个特征向量 feat = np.random.rand(10, 5) # 为每条边随机生成一个特征向量 e_feat = np.random.rand(15, 3) # 将特征向量添加到图中 g.ndata['feat'] = torch.from_numpy(feat) g.edata['e_feat'] =torch.from_numpy(e_feat) # 随机给每个节点分配一个标签 labels = np.random.randint(0, 3, size=(10,)) g.ndata['label'] = torch.from_numpy(labels) class GraphSAGE(nn.Module): def __init__(self, in_feats, h_feats, num_classes): super(GraphSAGE, self).__init__() self.conv1 = dgl.nn.SAGEConv(in_feats, h_feats, 'mean') self.conv2 = dgl.nn.SAGEConv(h_feats, num_classes, 'mean') def forward(self, g, in_feat): h = self.conv1(g, in_feat) h = torch.relu(h) h = self.conv2(g, h) g.ndata['h'] = h hg = dgl.mean_nodes(g, 'h') return hg # 定义超参数 in_feats = 5 h_feats = 10 num_classes = 3 lr = 0.01 num_epochs = 20 # 创建模型和优化器 model = GraphSAGE(in_feats, h_feats, num_classes) optimizer = torch.optim.Adam(model.parameters(), lr=lr) # 训练模型 for epoch in range(num_epochs): logits = model(g, g.ndata['feat']) labels = g.ndata['label'] loss = nn.CrossEntropyLoss()(logits, labels) optimizer.zero_grad() loss.backward() optimizer.step() print('Epoch %d | Loss: %.4f' % (epoch, loss.item())) # 预测 model.eval() with torch.no_grad(): logits = model(g, g.ndata['feat']) pred = logits.argmax(1) print('Predicted labels:', pred) 报错：RuntimeError: expected scalar type Double but found Float

这个错误是因为在创建特征向量时使用了numpy中的float64类型，而在将特征向量添加到图中时使用了torch中的float32类型。你可以在生成特征向量时将其转换为float32类型，如下所示： python feat = np.random.rand...

这是DGCHead的代码，我想让你在这段代码里加入正余弦位置编码：class DualGCNHead(nn.Module): def __init__(self, inplanes, interplanes, num_classes): super(DualGCNHead, self).__init__() self.conva = nn.Sequential(nn.Conv2d(inplanes, interplanes, 3, padding=1, bias=False), BatchNorm2d(interplanes), nn.ReLU(interplanes)) self.dualgcn = DualGCN(interplanes) self.convb = nn.Sequential(nn.Conv2d(interplanes, interplanes, 3, padding=1, bias=False), BatchNorm2d(interplanes), nn.ReLU(interplanes)) self.bottleneck = nn.Sequential( nn.Conv2d(inplanes + interplanes, interplanes, kernel_size=3, padding=1, dilation=1, bias=False), BatchNorm2d(interplanes), nn.ReLU(interplanes), nn.Conv2d(interplanes, num_classes, kernel_size=1, stride=1, padding=0, bias=True) ###################### 512-->256 ) def forward(self, x): output = self.conva(x) output = self.dualgcn(output) output = self.convb(output) output = self.bottleneck(torch.cat([x, output], 1)) return output

def __init__(self, inplanes, interplanes, num_classes, height, width): super(DualGCNHead, self).__init__() self.conva = nn.Sequential(nn.Conv2d(inplanes, interplanes, 3, padding=1, bias=False), ...

AttributeError: module 'torch.nn.modules' has no attribute 'resnet50'

def __init__(self, block, layers, num_classes=1000): self.inplanes = 64 super(ResNet, self).__init__() self.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3, bias=False) self.bn1 = nn...
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