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。