import torch import torchvision import matplotlib.pyplot as plt device = "cuda" if torch.cuda.is_available() else "cpu" data = torchvision.datasets.FashionMNIST(root=".", download=True) def show_images(data, num_samples=20, cols=4): """ Plots some samples from the dataset """ plt.figure(figsize=(15,15)) for i, img in enumerate(data): if i == num_samples: break plt.subplot(int(num_samples/cols + 1), cols, i + 1) plt.imshow(img[0]) show_images(data)

修改一下这段代码在pycharm中的实现，import pandas as pd import numpy as np from sklearn.model_selection import train_test_split import torch import torch.nn as nn import torch.nn.functional as F import torch.optim as optim #from torchvision import datasets,transforms import torch.utils.data as data #from torch .nn:utils import weight_norm import matplotlib.pyplot as plt from sklearn.metrics import precision_score from sklearn.metrics import recall_score from sklearn.metrics import f1_score from sklearn.metrics import cohen_kappa_score data_ = pd.read_csv(open(r"C:\Users\zhangjinyue\Desktop\rice.csv"),header=None) data_ = np.array(data_).astype('float64') train_data =data_[:,:520] train_Data =np.array(train_data).astype('float64') train_labels=data_[:,520] train_labels=np.array(train_data).astype('float64') train_data,train_data,train_labels,train_labels=train_test_split(train_data,train_labels,test_size=0.33333) train_data=torch.Tensor(train_data) train_data=torch.LongTensor(train_labels) train_data=train_data.reshape(-1,1,20,26) train_data=torch.Tensor(train_data) train_data=torch.LongTensor(train_labels) train_data=train_data.reshape(-1,1,20,26) start_epoch=1 num_epoch=1 BATCH_SIZE=70 Ir=0.001 classes=('0','1','2','3','4','5') device=torch.device("cuda"if torch.cuda.is_available()else"cpu") torch.backends.cudnn.benchmark=True best_acc=0.0 train_dataset=data.TensorDataset(train_data,train_labels) test_dataset=data.TensorDataset(train_data,train_labels) train_loader=torch.utills.data.DataLoader(dtaset=train_dataset,batch_size=BATCH_SIZE,shuffle=True) test_loader=torch.utills.data.DataLoader(dtaset=train_dataset,batch_size=BATCH_SIZE,shuffle=True)

device = torch.device("cuda" if torch.cuda.is_available() else "cpu") torch.backends.cudnn.benchmark = True best_acc = 0.0 train_dataset = data.TensorDataset(train_data, train_labels) test_dataset = ...

基于以下代码，加入图像高斯模糊处理代码：import torch import torch.nn as nn import torch.optim as optim import torch.nn.functional as F from torchvision import datasets,transforms import matplotlib.pyplot as plt import numpy as np import pylab %matplotlib inline # 定义超参数 input_size = 28 #图像的总尺寸28*28 num_classes = 10 #标签的种类数 num_epochs = 10 #训练的总循环周期 batch_size = 64 #一个撮（批次）的大小，64张图片 # 训练集 train_dataset = datasets.MNIST(root='./data', train=True, transform=transforms.ToTensor(), download=True) # 测试集 test_dataset = datasets.MNIST(root='./data', train=False, transform=transforms.ToTensor()) # 构建batch数据 train_loader = torch.utils.data.DataLoader(dataset=train_dataset, batch_size=batch_size, shuffle=True) test_loader = torch.utils.data.DataLoader(dataset=test_dataset, batch_size=batch_size, shuffle=True)

blur_kernel_tensor = torch.from_numpy(blur_kernel).unsqueeze(0).repeat(c, 1, 1, 1).float().to(x.device) x_blur = F.conv2d(x, blur_kernel_tensor, padding=(1, 1)) return x_blur # 对训练集图像进行...

在这代码里面加入获取准确率和损失值并且绘制函数的代码import os import sys import json import torch import torch.nn as nn from torchvision import transforms, datasets, utils import matplotlib.pyplot as plt import numpy as np import torch.optim as optim from tqdm import tqdm from m

device = torch.device("cuda" if torch.cuda.is_available() else "cpu") print("Using device:", device) # set up hyperparameters batch_size = 64 epochs = 10 lr = 0.01 # set up data loaders ...

请解释一下import matplotlib.pyplot as plt import numpy as np import torch import torch.utils.data.dataloader as Loader import torchvision import torchvision.transforms as transforms import torch.nn as nn import torch.nn.functional as F import torch.optim as optim from torch.utils.tensorboard import SummaryWriter BATCH SIZE = 4 transform - transforms.Compose( [transforms. ToTensor0, transforms.Normalize((0.5,), (0.5.)) trainset = torchvision.datasets.FashionMNIST(' /data', download True, train= True, transform=transform) testset = torchvision.datasets.FashionMNIST(' /data', download= True, train=False, transform= transform) trainloader = Loader.DataLoader(trainset, batch size= BATCH SIZE, shuffle True)testloader = Loader.Datal oader(testset, batch size=BATCH SIZE, shuffle- False)classes s ('T- shirt/top', 'Trouser', 'Pullover', 'Dress', 'Coat', 'Sandal', 'Shirt', 'Sneaker', 'Bag', 'Ankle Boot') class Net(nn.Module);: def_ init (self): super(Net, self). init 0这段代码

具体来说，代码首先导入了一些需要用到的Python库，如matplotlib、numpy、torch等。然后定义了一些超参数，如BATCH SIZE，以及数据集的变换transform。接着，代码使用torchvision库中的FashionMNIST数据集，并将其...

import torch import torchvision from torch.utils import data from torchvision import transforms from d2l import torch as d2l import matplotlib.pyplot as plt d2l.use_svg_display() #通过ToTensor实例将图像数据从PIL类型变换成32位浮点数格式 #并除以255使得所有像素的数值均在0-1之间 trans = transforms.ToTensor() mnist_train = torchvision.datasets.FashionMNIST( root = r"E:\py\python\test\deep learning\data",train=True,transform=trans,download=True ) mnist_test = torchvision.datasets.FashionMNIST( root = r"E:\py\python\test\deep learning\data",train=False,transform=trans,download=True ) print(len(mnist_train),len(mnist_test)) print(mnist_train[0][0].shape) def get_fashion_mnist_labels(labels): #@save """返回Fashion-MNIST数据集的文本标签""" text_labels = ['t-shirt','trouser','pullover','dress','coat', 'sandal','shirt','sneaker','bag','ankle boot'] return [text_labels[int(i)] for i in labels] def show_images(imgs,num_rows,num_cols,titles = None,scale=1.5): #@save """绘制图像列表""" figsize = (num_cols * scale,num_rows * scale) _,axes = d2l.plt.subplot(num_rows,num_cols,figsize=figsize) axes = axes.flatten() for i,(ax,img) in enumerate(zip(axes,imgs)): if torch.is_tensor(img): #图片张量 ax.imshow(img.numpy()) else: #PIL图片 ax.imshow(img) ax.axes.get_xaxis().set_visible(False) ax.axes.get_yaxis().set_visible(False) if titles: ax.set_title(titles[i]) return axes X,y = next(iter(data.DataLoader(mnist_train,batch_size=18))) show_images(X.reshape(18,28,28),2,9,titles=get_fashion_mnist_labels(y)); 这段代码运行不出来

1. 确保你已经安装了需要的依赖包，比如torch、torchvision、d2l和matplotlib。你可以通过在命令行运行"pip install torch torchvision matplotlib"来安装它们。 2. 检查数据集的路径是否正确。在这段代码中，数据...

这是对单个文件进行预测“import os import json import torch from PIL import Image from torchvision import transforms import matplotlib.pyplot as plt from model import convnext_tiny as create_model def main(): device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu") print(f"using {device} device.") num_classes = 5 img_size = 224 data_transform = transforms.Compose( [transforms.Resize(int(img_size * 1.14)), transforms.CenterCrop(img_size), transforms.ToTensor(), transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])]) # load image img_path = "../tulip.jpg" assert os.path.exists(img_path), "file: '{}' dose not exist.".format(img_path) img = Image.open(img_path) plt.imshow(img) # [N, C, H, W] img = data_transform(img) # expand batch dimension img = torch.unsqueeze(img, dim=0) # read class_indict json_path = './class_indices.json' assert os.path.exists(json_path), "file: '{}' dose not exist.".format(json_path) with open(json_path, "r") as f: class_indict = json.load(f) # create model model = create_model(num_classes=num_classes).to(device) # load model weights model_weight_path = "./weights/best_model.pth" model.load_state_dict(torch.load(model_weight_path, map_location=device)) model.eval() with torch.no_grad(): # predict class output = torch.squeeze(model(img.to(device))).cpu() predict = torch.softmax(output, dim=0) predict_cla = torch.argmax(predict).numpy() print_res = "class: {} prob: {:.3}".format(class_indict[str(predict_cla)], predict[predict_cla].numpy()) plt.title(print_res) for i in range(len(predict)): print("class: {:10} prob: {:.3}".format(class_indict[str(i)], predict[i].numpy())) plt.show() if name == 'main': main()”，改为对指定文件夹下的左右文件进行预测，并绘制混淆矩阵，

device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu") print(f"using {device} device.") num_classes = 5 img_size = 224 data_transform = transforms.Compose([ transforms.Resize...

详细解释代码import torch import torch.nn as nn import torch.optim as optim import torchvision import torchvision.transforms as transforms from torch.utils.data import DataLoader # 图像预处理 transform = transforms.Compose( [transforms.ToTensor(), transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))]) # 加载数据集 trainset = torchvision.datasets.CIFAR10(root='./data', train=True, download=True, transform=transform) trainloader = DataLoader(trainset, batch_size=128, shuffle=True, num_workers=0) testset = torchvision.datasets.CIFAR10(root='./data', train=False, download=True, transform=transform) testloader = DataLoader(testset, batch_size=128, shuffle=False, num_workers=0) # 构建模型 class RNNModel(nn.Module): def init(self): super(RNNModel, self).init() self.rnn = nn.RNN(input_size=3072, hidden_size=512, num_layers=2, batch_first=True) self.fc = nn.Linear(512, 10) def forward(self, x): # 将输入数据reshape成(batch_size, seq_len, feature_dim) x = x.view(-1, 3072, 1).transpose(1, 2) x, _ = self.rnn(x) x = x[:, -1, :] x = self.fc(x) return x net = RNNModel() # 定义损失函数和优化器 criterion = nn.CrossEntropyLoss() optimizer = optim.Adam(net.parameters(), lr=0.001) # 训练模型 loss_list = [] acc_list = [] for epoch in range(30): # 多批次循环 running_loss = 0.0 correct = 0 total = 0 for i, data in enumerate(trainloader, 0): # 获取输入 inputs, labels = data # 梯度清零 optimizer.zero_grad() # 前向传播，反向传播，优化 outputs = net(inputs) loss = criterion(outputs, labels) loss.backward() optimizer.step() # 打印统计信息 running_loss += loss.item() _, predicted = torch.max(outputs.data, 1) total += labels.size(0) correct += (predicted == labels).sum().item() acc = 100 * correct / total acc_list.append(acc) loss_list.append(running_loss / len(trainloader)) print('[%d] loss: %.3f, acc: %.3f' % (epoch + 1, running_loss / len(trainloader), acc)) print('Finished Training') torch.save(net.state_dict(), 'rnn1.pt') # 绘制loss变化曲线和准确率变化曲线 import matplotlib.pyplot as plt fig, axs = plt.subplots(2, 1, figsize=(10, 10)) axs[0].plot(loss_list) axs[0].set_title("Training Loss") axs[0].set_xlabel("Epoch") axs[0].set_ylabel("Loss") axs[1].plot(acc_list) axs[1].set_title("Training Accuracy") axs[1].set_xlabel("Epoch") axs[1].set_ylabel("Accuracy") plt.show() # 测试模型 correct = 0 total = 0 with torch.no_grad(): for data in testloader: images, labels = data outputs = net(images) _, predicted = torch.max(outputs.data, 1) total += labels.size(0) correct += (predicted == labels).sum().item() print('Accuracy of the network on the 10000 test images: %d %%' % (100 * correct / total))

trainset = torchvision.datasets.CIFAR10(root='./data', train=True, download=True, transform=transform) trainloader = DataLoader(trainset, batch_size=128, shuffle=True, num_workers=0) testset = ...

帮我把下面这个代码从TensorFlow改成pytorch import tensorflow as tf import os import numpy as np import matplotlib.pyplot as plt os.environ["CUDA_VISIBLE_DEVICES"] = "0" base_dir = 'E:/direction/datasetsall/' train_dir = os.path.join(base_dir, 'train_img/') validation_dir = os.path.join(base_dir, 'val_img/') train_cats_dir = os.path.join(train_dir, 'down') train_dogs_dir = os.path.join(train_dir, 'up') validation_cats_dir = os.path.join(validation_dir, 'down') validation_dogs_dir = os.path.join(validation_dir, 'up') batch_size = 64 epochs = 50 IMG_HEIGHT = 128 IMG_WIDTH = 128 num_cats_tr = len(os.listdir(train_cats_dir)) num_dogs_tr = len(os.listdir(train_dogs_dir)) num_cats_val = len(os.listdir(validation_cats_dir)) num_dogs_val = len(os.listdir(validation_dogs_dir)) total_train = num_cats_tr + num_dogs_tr total_val = num_cats_val + num_dogs_val train_image_generator = tf.keras.preprocessing.image.ImageDataGenerator(rescale=1. / 255) validation_image_generator = tf.keras.preprocessing.image.ImageDataGenerator(rescale=1. / 255) train_data_gen = train_image_generator.flow_from_directory(batch_size=batch_size, directory=train_dir, shuffle=True, target_size=(IMG_HEIGHT, IMG_WIDTH), class_mode='categorical') val_data_gen = validation_image_generator.flow_from_directory(batch_size=batch_size, directory=validation_dir, target_size=(IMG_HEIGHT, IMG_WIDTH), class_mode='categorical') sample_training_images, _ = next(train_data_gen) model = tf.keras.models.Sequential([ tf.keras.layers.Conv2D(16, 3, padding='same', activation='relu', input_shape=(IMG_HEIGHT, IMG_WIDTH, 3)), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Conv2D(32, 3, padding='same', activation='relu'), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Conv2D(64, 3, padding='same', activation='relu'), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Flatten(), tf.keras.layers.Dense(256, activation='relu'), tf.keras.layers.Dense(2, activation='softmax') ]) model.compile(optimizer='adam', loss=tf.keras.losses.BinaryCrossentropy(from_logits=True), metrics=['accuracy']) model.summary() history = model.fit_generator( train_data_gen, steps_per_epoch=total_train // batch_size, epochs=epochs, validation_data=val_data_gen, validation_steps=total_val // batch_size ) # 可视化训练结果 acc = history.history['accuracy'] val_acc = history.history['val_accuracy'] loss = history.history['loss'] val_loss = history.history['val_loss'] epochs_range = range(epochs) model.save("./model/timo_classification_128_maxPool2D_dense256.h5")

import torch import os import numpy as np import matplotlib.pyplot as plt os.environ["CUDA_VISIBLE_DEVICES"] = "0" base_dir = 'E:/direction/datasetsall/' train_dir = os.path.join(base_dir, 'train_img/...

帮我把这段代码从tensorflow框架改成pytorch框架： import tensorflow as tf import os import numpy as np import matplotlib.pyplot as plt os.environ["CUDA_VISIBLE_DEVICES"] = "0" base_dir = 'E:/direction/datasetsall/' train_dir = os.path.join(base_dir, 'train_img/') validation_dir = os.path.join(base_dir, 'val_img/') train_cats_dir = os.path.join(train_dir, 'down') train_dogs_dir = os.path.join(train_dir, 'up') validation_cats_dir = os.path.join(validation_dir, 'down') validation_dogs_dir = os.path.join(validation_dir, 'up') batch_size = 64 epochs = 50 IMG_HEIGHT = 128 IMG_WIDTH = 128 num_cats_tr = len(os.listdir(train_cats_dir)) num_dogs_tr = len(os.listdir(train_dogs_dir)) num_cats_val = len(os.listdir(validation_cats_dir)) num_dogs_val = len(os.listdir(validation_dogs_dir)) total_train = num_cats_tr + num_dogs_tr total_val = num_cats_val + num_dogs_val train_image_generator = tf.keras.preprocessing.image.ImageDataGenerator(rescale=1. / 255) validation_image_generator = tf.keras.preprocessing.image.ImageDataGenerator(rescale=1. / 255) train_data_gen = train_image_generator.flow_from_directory(batch_size=batch_size, directory=train_dir, shuffle=True, target_size=(IMG_HEIGHT, IMG_WIDTH), class_mode='categorical') val_data_gen = validation_image_generator.flow_from_directory(batch_size=batch_size, directory=validation_dir, target_size=(IMG_HEIGHT, IMG_WIDTH), class_mode='categorical') sample_training_images, _ = next(train_data_gen) model = tf.keras.models.Sequential([ tf.keras.layers.Conv2D(16, 3, padding='same', activation='relu', input_shape=(IMG_HEIGHT, IMG_WIDTH, 3)), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Conv2D(32, 3, padding='same', activation='relu'), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Conv2D(64, 3, padding='same', activation='relu'), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Flatten(), tf.keras.layers.Dense(256, activation='relu'), tf.keras.layers.Dense(2, activation='softmax') ]) model.compile(optimizer='adam', loss=tf.keras.losses.BinaryCrossentropy(from_logits=True), metrics=['accuracy']) model.summary() history = model.fit_generator( train_data_gen, steps_per_epoch=total_train // batch_size, epochs=epochs, validation_data=val_data_gen, validation_steps=total_val // batch_size ) # 可视化训练结果 acc = history.history['accuracy'] val_acc = history.history['val_accuracy'] loss = history.history['loss'] val_loss = history.history['val_loss'] epochs_range = range(epochs) model.save("./model/timo_classification_128_maxPool2D_dense256.h5")

device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu") model = nn.Sequential( nn.Conv2d(3, 16, 3, padding=1), nn.ReLU(), nn.MaxPool2d(2), nn.Conv2d(16, 32, 3, padding=1), nn.ReLU(), ...

from dataset.mnist import load_mnist from two_layer_net import TwoLayerNet 实现以上代码 python需要如何安装相关库

import matplotlib.pyplot as plt # 如果用PyTorch import torch from torchvision import datasets, transforms from your_project_folder.two_layer_net import TwoLayerNet # 指定你的实际文件位置

#定义一个get_fea类函数，返回类变量x0 def get_fea_x0(self): return self.fea_x0 def get_fea_x1(self): return self.fea_x1 def get_fea_x2(self): return self.fea_x2 def get_fea_x3(self): return self.fea_x3 卷积神经网络已建立，利用上述代码，在此基础上修改出pytorch框架下调用指定层的tsne 中文回答 2023/5/26 11:07:08

import matplotlib.pyplot as plt # 定义卷积神经网络 class CNN(torch.nn.Module): def __init__(self): super(CNN, self).__init__() self.conv1 = torch.nn.Conv2d(3, 32, 3, padding=1) self.conv2 = torch...

使用深度学习库pytorch完成图像分类任务，搭建卷积神经网络的经典模型AlexNet，完成对cifar-10数据的分类任务，记录训练过程中的损失和准确率以及测试集的损失和准确率，并将其可视化，分析结果。文件夹cifar-10-batches-py包含我们的图像分类问题的数据集,data_batch_1,2..5为训练数据，test_batch为测试数据,为了方便图片转成张量，使用torchvision加载和处理数据集。图像加载预处理示例代码见ex5-1.py。

import matplotlib.pyplot as plt # 定义数据集 transform = transforms.Compose( [transforms.ToTensor(), transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))]) trainset = torchvision.datasets.CIFAR...

1.使用PyTorch实现LeNet网络 2.使用实验7的 Fashion MNIST 对LeNet进行训练和测试，优化算法采用SGD或Adam，torch.optim.SGD 或 torch.optim.Adam 3.分别绘制训练和测试的损失函数曲线和分类正确率曲线 4.调节BatchSize、学习率，并依据测试损失曲线的拐点确定最佳模型，保存该模型 5.使用测试集测试所保存模型的性能，以混淆矩阵展示

import matplotlib.pyplot as plt 接下来，我们定义LeNet网络的结构。 python class LeNet(nn.Module): def __init__(self): super(LeNet, self).__init__() self.conv1 = nn.Conv2d(1, 6, 5) self....

1.使用PyTorch实现LeNet网络 2.使用本地文件夹的 Fashion MNIST 对LeNet进行训练和测试，优化算法采用SGD或Adam，torch.optim.SGD 或 torch.optim.Adam 3.分别绘制训练和测试的损失函数曲线和分类正确率曲线 4.调节BatchSize、学习率，并依据测试损失曲线的拐点确定最佳模型，保存该模型 5.使用测试集测试所保存模型的性能，以混淆矩阵展示

import matplotlib.pyplot as plt import numpy as np 2.定义LeNet网络 python class LeNet(nn.Module): def __init__(self): super(LeNet, self).__init__() self.conv1 = nn.Conv2d(1, 6, 5) self....

torch.hub.load加载本地模型可视化显示结果Python代码

import matplotlib.pyplot as plt model = torch.hub.load('pytorch/vision', 'resnet18', pretrained=True) # 假设你有一张图片文件 test.jpg img = torchvision.transforms.ToTensor()(torchvision.datasets....

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