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_path1 = '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(i) file_path1 = os.path.join(folder_path1, file_name) matrix1 = np.load(file_path1) x[j] = torch.from_numpy(matrix1).unsqueeze(0) folder_path2 = 'random_label2' y = torch.empty((40, 1)) for k in range(40): for k in range(40): file_name = 'label_{}.npy'.format(i) file_path2 = os.path.join(folder_path2, file_name) matrix2 = np.load(file_path2) y[k] = torch.from_numpy(matrix2).unsqueeze(0) for epoch in range(10): running_loss = 0.0 for i in range(40): inputs, labels = x[i], y[i] optimizer.zero_grad() outputs = net(inputs) optimizer.step() #running_loss += loss.item() #print('[%d] loss: %.3f' % (epoch + 1, running_loss / 40)) print('Finished Training') 加入loss可视化

你可以使用matplotlib库来可视化训练过程中的loss。可以在每个epoch结束后将loss存储到一个列表中，最后使用matplotlib库绘制出loss随epoch变化的曲线。示例代码如下：

import matplotlib.pyplot as plt

# 创建空列表，用于存储每个epoch的loss
losses = []

for epoch in range(10):
    running_loss = 0.0
    for i in range(40):
        inputs, labels = x[i], y[i]
        optimizer.zero_grad()
        outputs = net(inputs)
        loss = criterion(outputs, labels)
        loss.backward()
        optimizer.step()
        running_loss += loss.item()
    # 存储每个epoch的loss
    losses.append(running_loss / 40)
    print('[%d] loss: %.3f' % (epoch + 1, running_loss / 40))

print('Finished Training')

# 绘制loss随epoch变化的曲线
plt.plot(losses)
plt.xlabel('Epoch')
plt.ylabel('Loss')
plt.show()

这段代码会在每个epoch结束后将loss存储到列表losses中，最后使用matplotlib库绘制出loss随epoch变化的曲线。