處理不平衡數(shù)據(jù)在PyTorch中通常有幾種常用的方法:
weight
來指定每個(gè)類別的權(quán)重。weights = [0.1, 0.9] # 類別權(quán)重
criterion = nn.CrossEntropyLoss(weight=torch.Tensor(weights))
torch.utils.data
中的WeightedRandomSampler
來實(shí)現(xiàn)重采樣。from torch.utils.data import WeightedRandomSampler
weights = [0.1, 0.9] # 類別權(quán)重
sampler = WeightedRandomSampler(weights, len(dataset), replacement=True)
transform = transforms.Compose([
transforms.RandomHorizontalFlip(),
transforms.RandomRotation(10),
transforms.RandomResizedCrop(224),
])
以上是幾種常用的處理不平衡數(shù)據(jù)的方法,在實(shí)際應(yīng)用中可以根據(jù)數(shù)據(jù)集的特點(diǎn)和需求選擇合適的方法。