EPOCH = 100 pre_epoch = 0 BATCH_SIZE = 100 LR = 0.0005 ratio = 0.8
时间: 2024-02-14 09:33:40 浏览: 131
根据您提供的信息,我猜测这是一段训练神经网络的代码。其中,EPOCH等于100表示训练数据集将被遍历100次。pre_epoch等于0可能是指之前没有进行过训练。BATCH_SIZE等于100表示在每次训练迭代中,将有100个数据样本被送入神经网络进行训练。LR等于0.0005是指学习率为0.0005,这是一个用于控制权重更新步长的超参数。ratio等于0.8可能是指将训练数据集划分成训练集和验证集时,训练集所占的比例为0.8,验证集所占比例为0.2。
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class Trainer(object): def __init__(self, net, per_num=20, start_num=0, end_num=10, save_path="./model/Lwf", epoch=50, lr=0.0005, batch_size=128): self.lr = lr self.epoch = epoch self.batch_size = batch_size self.strat_num = start_num self.end_num = end_num self.class_num = end_num - start_num self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu") self.save_path = save_path self.main_net_path = save_path + "/LwF_" + str(start_num) + ".pth" transform_train = transforms.Compose([ transforms.RandomCrop(32, padding=4), transforms.RandomHorizontalFlip(), transforms.RandomRotation(10), transforms.ToTensor(), transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5)), ]) transform_test = transforms.Compose([ transforms.ToTensor(), transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5)), ]) trainset = Cifar100Split(start_num=start_num, end_num=end_num, train=True, transform=transform_train) testset = Cifar100Split(start_num=start_num, end_num=end_num, train=False, transform=transform_test) test_all = Cifar100Split(start_num=0, end_num=end_num, train=False, transform=transform_test) self.train_loader = DataLoader(trainset, batch_size=batch_size, shuffle=True, num_workers=0) self.test_loader = DataLoader(testset, batch_size=batch_size, shuffle=False, num_workers=0) self.test_loader_all = DataLoader(test_all, batch_size=batch_size, shuffle=False, num_workers=0)
这段代码是一个PyTorch中的类Trainer的初始化函数。在初始化时,它接受一些参数,包括网络模型net、每个类别的训练样本数per_num、起始类别编号start_num、结束类别编号end_num、保存路径save_path、训练轮数epoch、学习率lr、批量大小batch_size等。此外,该类还定义了一些图像预处理的操作,包括随机裁剪、随机翻转、随机旋转等,并对训练集和测试集进行了划分和加载。该类的作用是训练深度神经网络模型以实现对图像数据的分类任务。
dataset = CocoDetection(root=r'D:\file\study\data\COCO2017\train2017', annFile=r'D:\file\study\data\COCO2017\annotations\instances_train2017.json', transforms=transforms.Compose([transforms.ToTensor()])) # 定义训练集和测试集的比例 train_ratio = 0.8 test_ratio = 0.2 # 计算训练集和测试集的数据数量 num_data = len(dataset) num_train_data = int(num_data * train_ratio) num_test_data = num_data - num_train_data # 使用random_split函数将数据集划分为训练集和测试集 train_dataset, test_dataset = random_split(dataset, [num_train_data, num_test_data]) # 打印训练集和测试集的数据数量 print(f"Number of training data: {len(train_dataset)}") print(f"Number of test data: {len(test_dataset)}") train_loader = DataLoader(train_dataset, batch_size=8, shuffle=True, num_workers=0) test_loader = DataLoader(test_dataset, batch_size=8, shuffle=True, num_workers=0) # define the optimizer and the learning rate scheduler params = [p for p in model.parameters() if p.requires_grad] optimizer = torch.optim.SGD(params, lr=0.005, momentum=0.9, weight_decay=0.0005) lr_scheduler = torch.optim.lr_scheduler.StepLR(optimizer, step_size=3, gamma=0.1) # train the model for 10 epochs num_epochs = 10 for epoch in range(num_epochs): # 将模型设置为训练模式 model.train() # 初始化训练损失的累计值 train_loss = 0.0 # 构建一个迭代器,用于遍历数据集 for i, images, targets in train_loader: print(images) print(targets) # 将数据转移到设备上 images = list(image.to(device) for image in images) targets = [{k: v.to(device) for k, v in t.items()} for t in targets]上述代码报错:TypeError: call() takes 2 positional arguments but 3 were given
这个错误是因为在你的数据读取过程中,`train_loader`返回了三个值,包括索引、图像和目标,但是你在迭代器中只使用了后两个值。为了解决这个问题,你可以修改迭代器的定义,将索引也加入到迭代器中,如下所示:
```python
for i, (images, targets) in enumerate(train_loader):
# do something with images and targets
```
这样,你就可以使用`enumerate`函数获取每个批次数据的索引,同时获取图像和目标。同时,如果你希望在训练过程中输出批次数据的索引,你也可以在代码中加入打印语句,如下所示:
```python
for i, (images, targets) in enumerate(train_loader):
print(f"Batch {i}:")
# do something with images and targets
```
希望这可以帮助你解决问题。
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