def __init__(self, num_classes=77): super(AlexNet, self).__init__() self.features = nn.Sequential( nn.Conv2d(3, 64, kernel_size=11, stride=4, padding=5), nn.ReLU(inplace=True), nn.MaxPool2d(kernel_size=2, stride=2), nn.Conv2d(64, 192, kernel_size=5, padding=2), nn.ReLU(inplace=True), nn.MaxPool2d(kernel_size=2, stride=2), nn.Conv2d(192, 384, kernel_size=3, padding=1), nn.ReLU(inplace=True), nn.Conv2d(384, 256, kernel_size=3, padding=1), nn.ReLU(inplace=True), nn.Conv2d(256, 256, kernel_size=3, padding=1), nn.ReLU(inplace=True), nn.MaxPool2d(kernel_size=2, stride=2), ) self.classifier = nn.Linear(256, num_classes)

时间: 2023-09-15 10:22:34 浏览: 45
This is the constructor of the AlexNet class in PyTorch. It defines the architecture of the AlexNet model, which is a deep convolutional neural network designed for image classification tasks. The model consists of two main parts: the feature extractor and the classifier. The feature extractor is composed of several convolutional layers followed by max pooling layers, which extract high-level features from the input image. The classifier is a fully connected layer that maps the extracted features to the output classes. The input to the model is a 3-channel image with height and width of at least 227 pixels. The output is a probability distribution over the 77 possible classes (by default). Overall, this model is effective for image classification tasks and has achieved state-of-the-art performance on several benchmark datasets.

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解释class GraphMLPEncoder(FairseqEncoder): def __init__(self, args): super().__init__(dictionary=None) self.max_nodes = args.max_nodes self.emb_dim = args.encoder_embed_dim self.num_layer = args.encoder_layers self.num_classes = args.num_classes self.atom_encoder = GraphNodeFeature( num_heads=1, num_atoms=512*9, num_in_degree=512, num_out_degree=512, hidden_dim=self.emb_dim, n_layers=self.num_layer, ) self.linear = torch.nn.ModuleList() self.batch_norms = torch.nn.ModuleList() for layer in range(self.num_layer): self.linear.append(torch.nn.Linear(self.emb_dim, self.emb_dim)) self.batch_norms.append(torch.nn.BatchNorm1d(self.emb_dim)) self.graph_pred_linear = torch.nn.Linear(self.emb_dim, self.num_classes)

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class NormedLinear(nn.Module): def __init__(self, feat_dim, num_classes): super().__init__() self.weight = nn.Parameter(torch.Tensor(feat_dim, num_classes)) self.weight.data.uniform_(-1, 1).renorm_(2, 1, 1e-5).mul_(1e5) def forward(self, x): return F.normalize(x, dim=1).mm(F.normalize(self.weight, dim=0)) class LearnableWeightScalingLinear(nn.Module): def __init__(self, feat_dim, num_classes, use_norm=False): super().__init__() self.classifier = NormedLinear(feat_dim, num_classes) if use_norm else nn.Linear(feat_dim, num_classes) self.learned_norm = nn.Parameter(torch.ones(1, num_classes)) def forward(self, x): return self.classifier(x) * self.learned_norm class DisAlignLinear(nn.Module): def __init__(self, feat_dim, num_classes, use_norm=False): super().__init__() self.classifier = NormedLinear(feat_dim, num_classes) if use_norm else nn.Linear(feat_dim, num_classes) self.learned_magnitude = nn.Parameter(torch.ones(1, num_classes)) self.learned_margin = nn.Parameter(torch.zeros(1, num_classes)) self.confidence_layer = nn.Linear(feat_dim, 1) torch.nn.init.constant_(self.confidence_layer.weight, 0.1) def forward(self, x): output = self.classifier(x) confidence = self.confidence_layer(x).sigmoid() return (1 + confidence * self.learned_magnitude) * output + confidence * self.learned_margin class MLP_ConClassfier(nn.Module): def __init__(self): super(MLP_ConClassfier, self).__init__() self.num_inputs, self.num_hiddens_1, self.num_hiddens_2, self.num_hiddens_3, self.num_outputs \ = 41, 512, 128, 32, 5 self.num_proj_hidden = 32 self.mlp_conclassfier = nn.Sequential( nn.Linear(self.num_inputs, self.num_hiddens_1), nn.ReLU(), nn.Linear(self.num_hiddens_1, self.num_hiddens_2), nn.ReLU(), nn.Linear(self.num_hiddens_2, self.num_hiddens_3), ) self.fc1 = torch.nn.Linear(self.num_hiddens_3, self.num_proj_hidden) self.fc2 = torch.nn.Linear(self.num_proj_hidden, self.num_hiddens_3) self.linearclassfier = nn.Linear(self.num_hiddens_3, self.num_outputs) self.NormedLinearclassfier = NormedLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs) self.DisAlignLinearclassfier = DisAlignLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs, use_norm=True) self.LearnableWeightScalingLinearclassfier = LearnableWeightScalingLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs, use_norm=True)

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class MobileNetV2Head(nn.Cell): def __init__(self, input_channel=1280, num_classes=1000, has_dropout=False, activation="None"): super(MobileNetV2Head, self).__init__() # mobilenet head head = ([GlobalAvgPooling()] if not has_dropout else [GlobalAvgPooling(), nn.Dropout(0.2)]) self.head = nn.SequentialCell(head) self.dense = nn.Dense(input_channel, num_classes, has_bias=True) self.need_activation = True if activation == "Sigmoid": self.activation = ops.Sigmoid() elif activation == "Softmax": self.activation = ops.Softmax() else: self.need_activation = False self._initialize_weights() def construct(self, x): x = self.head(x) x = self.dense(x) if self.need_activation: x = self.activation(x) return x

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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....

TypeError: __init__() got an unexpected keyword argument 'num_classes'

def __init__(self, num_classes): super(MyModel, self).__init__() self.num_classes = num_classes # 创建模型实例时传递了不被接受的关键字参数 model = MyModel(num_classes=10, indices=[1, 2, 3]) # ...

def __init__(self, block, blocks_num, num_classes=1000, include_top=True, groups=1, width_per_group=64): super(ResNet, self).__init__()

在初始化函数中，我们首先调用父类的初始化函数super(ResNet, self).__init__()，然后定义模型的超参数和基本结构。其中，根据blocks_num的数量，我们定义了四个阶段，每个阶段使用相同数量的基本块。我们也可以通过...

class Voice_Model(tf.keras.Model): def __init__(self,config): self.config = config super(Voice_Model,self).__init__() self.lstm_1=tf.keras.layers.LSTM(config.num_filters,dropout=0.5,return_sequences=True,unroll=True) self.lstm_2 = tf.keras.layers.LSTM(config.num_filters, dropout=0.5, unroll=True) self.fc= tf.keras.layers.Dense(config.hidden_dim) self.dro = tf.keras.layers.Dropout(0.5) self.outlater = tf.keras.layers.Dense(config.num_classes,activation='softmax') def __call__(self,inputs,training=None,**kwargs): x = inputs x = self.lstm_1(x) x = self.lstm_2(x) x = self.fc(x) x = self.outlater(x) return x

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class DoubleFastRCNNOutputLayers(nn.Module): def __init__( self, cfg, input_size, num_classes, cls_agnostic_bbox_reg, box_dim=4 ): super(DoubleFastRCNNOutputLayers, self).__init__() if not isinstance(input_size, int): input_size = np.prod(input_size) self.cls_score = nn.Linear(input_size, num_classes + 1) num_bbox_reg_classes = 1 if cls_agnostic_bbox_reg else num_classes self.bbox_pred = nn.Linear(input_size, num_bbox_reg_classes * box_dim) nn.init.normal_(self.cls_score.weight, std=0.01) nn.init.normal_(self.bbox_pred.weight, std=0.001) for l in [self.cls_score, self.bbox_pred]: nn.init.constant_(l.bias, 0) self._do_cls_dropout = cfg.MODEL.ROI_HEADS.CLS_DROPOUT self._dropout_ratio = cfg.MODEL.ROI_HEADS.DROPOUT_RATIO def forward(self, x_s, x_l): if x_s.dim() > 2: x_s = torch.flatten(x_s, start_dim=1) if x_l.dim() > 2: x_l = torch.flatten(x_l, start_dim=1) proposal_deltas = self.bbox_pred(x_l) if self._do_cls_dropout: x_s = F.dropout(x_s, self._dropout_ratio, training=self.training) scores = self.cls_score(x_s) return scores, proposal_deltas

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def __init__(self, config): super(Model, self).__init__() if config.embedding_pretrained is not None: self.embedding = nn.Embedding.from_pretrained(config.embedding_pretrained, freeze=False) else: self.embedding = nn.Embedding(config.n_vocab, config.embed, padding_idx=config.n_vocab - 1) self.lstm = nn.LSTM(config.embed, config.hidden_size, config.num_layers, bidirectional=True, batch_first=True, dropout=config.dropout) self.fc = nn.Linear(config.hidden_size * 2, config.num_classes)

4. 初始化一个全连接层，将LSTM输出的双向隐藏状态拼接后，经过一个线性变换得到最终的输出结果，输出维度为config.num_classes。 这个模型的输入是一个batch的词索引序列，输出是每个样本对应的类别。

class UNet(paddle.nn.Layer): def __init__(self, num_classes): super(UNet, self).__init__() self.conv_1 = paddle.nn.Conv2D(3, 32, kernel_size=3, stride=2, padding='same') self.bn = paddle.nn.BatchNorm2D(32) self.relu = paddle.nn.ReLU() in_channels = 32 self.encoders = [] self.encoder_list = [64, 128, 256] self.decoder_list = [256, 128, 64, 32] # 根据下采样个数和配置循环定义子Layer，避免重复写一样的程序 for out_channels in self.encoder_list: block = self.add_sublayer('encoder_{}'.format(out_channels), Encoder(in_channels, out_channels)) self.encoders.append(block) in_channels = out_channels self.decoders = [] # 根据上采样个数和配置循环定义子Layer，避免重复写一样的程序 for out_channels in self.decoder_list: block = self.add_sublayer('decoder_{}'.format(out_channels), Decoder(in_channels, out_channels)) self.decoders.append(block) in_channels = out_channels self.output_conv = paddle.nn.Conv2D(in_channels, num_classes, kernel_size=3, padding='same') def forward(self, inputs): y = self.conv_1(inputs) y = self.bn(y) y = self.relu(y) for encoder in self.encoders: y = encoder(y) for decoder in self.decoders: y = decoder(y) y = self.output_conv(y) return y怎么将该unet网络的层数改为5层

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class ImageDataset(Dataset): def init( self, resolution, image_paths, classes=None, shard=0, num_shards=1, random_crop=False, random_flip=True, ): super().init() self.resolution = resolution self.local_images = image_paths[shard:][::num_shards] self.local_classes = None if classes is None else classes[shard:][::num_shards] self.random_crop = random_crop self.random_flip = random_flip 里面的self.resolution如何实例化

dataset = ImageDataset(resolution=(256, 256), image_paths=image_paths, classes=classes, shard=0, num_shards=1, random_crop=True, random_flip=True) 在这个例子中，resolution 被实例化为一个元组 ...

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- 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_...

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

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class ResNet_101(nn.Module): def __init__(self, num_classes): super(ResNet_101, self).__init__() model = torchvision.models.resnet50(pretrained=True) model.fc = nn.Sequential( nn.Linear(model.fc.in_features, num_classes, bias=True), ) self.net = model def forward(self, img): output = self.net(img) return output如何做def state_dict(self):

def state_dict(self): state_dict = { 'model': self.net.state_dict(), } return state_dict 在这个方法中，你创建了一个名为state_dict的字典对象，并将整个模型的状态字典存储在其中的一个键值对中，...

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

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...

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