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锟斤拷锟绞癸拷锟� Pytorch 锟叫碉拷 DataSet 锟斤拷 DataLoader

锟斤拷源锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷|锟斤拷时锟戒：2024-10-30 09:48:34 |锟斤拷锟侥讹拷锟斤拷198锟斤拷|锟斤拷锟斤拷签锟斤拷 a T S C 锟斤拷锟窖� 锟斤拷锟斤拷 |锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷戏

锟斤拷锟绞癸拷锟斤拷锟斤拷菁锟紻ataSet锟斤拷锟节斤拷锟斤拷DataLoader之前锟斤拷锟斤拷要锟斤拷锟剿斤拷锟斤拷锟捷硷拷DataSet锟斤拷使锟矫★拷Pytorch锟叫硷拷锟斤拷锟剿很讹拷锟窖撅拷锟斤拷锟斤拷锟矫碉拷锟斤拷锟捷硷拷锟斤拷锟斤拷pytorch锟斤拷torchvision锟斤拷torchtext锟斤拷模锟斤拷锟斤拷一些锟斤拷锟酵碉拷锟斤拷锟捷硷拷锟斤拷锟斤拷锟斤拷通锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷使锟矫★拷锟斤拷CIFAR10 锟斤拷锟捷硷拷为锟斤拷锟斤拷锟侥碉拷锟窖撅拷锟斤拷

Pytorch锟叫硷拷锟斤拷锟剿达拷锟斤拷锟窖达拷锟斤拷锟矫碉拷锟斤拷锟捷硷拷锟斤拷锟斤拷torchvision锟斤拷torchtext锟斤拷模锟斤拷锟叫讹拷锟斤拷一些锟斤拷锟酵碉拷锟斤拷锟捷硷拷锟斤拷锟矫伙拷锟斤拷锟斤拷通锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟截诧拷使锟斤拷锟斤拷些锟斤拷锟捷硷拷锟斤拷锟斤拷锟界，CIFAR10 锟斤拷锟捷硷拷锟窖撅拷锟斤拷锟斤拷锟斤拷锟矫非筹拷锟斤拷锟斤拷锟剿★拷锟斤拷锟斤拷要注锟斤拷锟斤拷锟� transform 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟酵硷拷锟阶拷锟轿拷锟斤拷锟揭拷母锟绞斤拷锟斤拷锟斤拷缃玃IL锟斤拷式锟斤拷图锟斤拷转锟斤拷为tensor锟斤拷式锟斤拷图锟斤拷

锟节斤拷锟斤拷 DataLoader 之前锟斤拷锟斤拷要锟斤拷锟剿斤拷锟斤拷锟绞癸拷锟� DataSet锟斤拷Pytorch 锟叫碉拷DataSet锟斤拷一锟斤拷锟芥储锟斤拷锟斤拷锟斤拷锟捷ｏ拷锟斤拷锟斤拷图锟斤拷锟斤拷频锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷DataLoader 锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷锟叫革拷锟斤拷锟斤拷锟缴癸拷锟杰碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫分革拷锟斤拷锟斤拷锟杰讹拷小锟斤拷锟戒，锟斤拷锟斤拷锟皆硷拷锟借定一锟斤拷小锟斤拷锟斤拷锟叫讹拷锟劫革拷锟斤拷锟捷硷拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷桑锟矫匡拷谓锟斤拷锟斤拷莘沤锟斤拷锟斤拷锟叫★拷锟斤拷锟斤拷时锟斤拷要锟斤拷要锟斤拷源锟斤拷锟捷硷拷锟斤拷锟斤拷锟劫斤拷锟斤拷锟斤拷锟缴等等★拷

锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷锟捷硷拷锟斤拷锟矫伙拷锟斤拷锟皆撅拷锟斤拷锟斤拷未锟斤拷锟斤拷菁锟斤拷锟斤拷锟斤拷锟饺★拷锟斤拷锟斤拷锟斤拷锟斤拷锟窖碉拷锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟饺★拷锟斤拷锟斤拷锟斤拷锟斤拷锟轿伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷菁锟斤拷锟斤拷蟹指睿拷锟斤拷锟斤拷菁锟斤拷锟斤拷蟹指锟街耙拷锟揭拷锟斤拷锟斤拷锟斤拷菁锟斤拷鹊取锟紻ataLoader锟侥斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟斤拷锟斤拷菁锟斤拷锟斤拷蟹指锟侥达拷锟街碉拷锟叫憋拷锟斤拷锟叫憋拷锟叫碉拷每锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟矫的讹拷锟劫革拷锟斤拷锟捷硷拷锟侥讹拷锟斤拷锟斤拷隙锟斤拷傻摹锟�

锟斤拷锟绞癸拷锟� DataLoader锟斤拷

getitem锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷要锟斤拷锟斤拷锟斤拷 __getitem__ 锟斤拷锟斤拷锟斤拷__getitem__锟斤拷锟斤拷为魔锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷Python锟叫讹拷锟斤拷一锟斤拷锟斤拷锟绞憋拷锟斤拷锟斤拷锟斤拷要通锟斤拷锟斤拷锟斤拷锟矫碉拷锟斤拷锟斤拷锟斤拷值锟斤拷锟斤拷锟斤拷要 __getitem__ 锟斤拷锟斤拷锟斤拷__getitem__ 锟斤拷锟斤拷锟斤拷锟斤拷锟矫撅拷锟斤拷锟节碉拷锟斤拷锟斤拷锟绞憋拷锟斤拷远锟斤拷锟斤拷锟斤拷锟� __getitem__ 锟斤拷锟斤拷锟斤拷锟斤拷锟捷ｏ拷锟矫斤拷锟斤拷锟斤拷锟斤拷亍锟�

    
        class Fib():
            def __init__(self,start=0,step=1):
                self.step=step
            def __getitem__(self, key):
                a = key+self.step
                return a
        s=Fib()
        s[1]

锟斤拷锟界，锟斤拷Pytorch锟叫碉拷CIFAR10锟斤拷锟捷硷拷锟叫ｏ拷锟斤拷锟皆匡拷锟斤拷源锟斤拷锟叫碉拷 __getitem__ 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥★拷

    
        def __getitem__(self, index: int) -> Tuple[Any, Any]:
            img, target = self.data[index], self.targets[index]
            img = Image.fromarray(img)
            if self.transform is not None:
                img = self.transform(img)
            if self.target_transform is not None:
                target = self.target_transform(target)
            return img, target

DataLoader 锟斤法

锟矫伙拷锟斤拷锟斤拷锟斤拷Pytorch锟斤拷Documents锟侥碉拷锟叫查看DataLoader锟斤拷使锟矫凤拷锟斤拷锟斤拷锟斤拷锟叫斤拷锟杰硷拷锟斤拷锟饺较筹拷锟矫的诧拷锟斤拷锟斤拷锟斤拷锟斤拷 dataset锟斤拷batch_size锟斤拷shuffle锟斤拷num_workers 锟斤拷 drop_last锟斤拷锟斤拷锟叫ｏ拷batch_size锟斤拷示锟斤拷锟斤拷锟捷硷拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷取锟斤拷锟斤拷锟斤拷锟捷ｏ拷shuffle锟斤拷示锟角凤拷锟斤拷每锟轿诧拷锟斤拷锟斤拷时锟斤拷锟斤拷锟斤拷锟斤拷菁锟斤拷锟揭伙拷锟窖★拷锟轿猅rue锟斤拷num_workers锟斤拷示锟斤拷锟竭程斤拷锟斤拷锟斤拷取锟斤拷锟捷诧拷锟斤拷锟斤拷0锟斤拷示只锟斤拷锟斤拷锟竭筹拷锟叫诧拷锟斤拷锟斤拷drop_last锟斤拷示锟斤拷锟斤拷锟饺★拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷欠锟斤拷锟斤拷锟斤拷剩锟铰的诧拷锟街★拷

dataset锟斤拷锟斤拷锟斤拷锟矫伙拷锟斤拷锟斤拷锟捷硷拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟捷硷拷锟斤拷锟斤拷锟斤拷爰达拷伞锟�
shuffle锟斤拷锟角凤拷锟斤拷每锟轿诧拷锟斤拷锟斤拷时锟斤拷锟斤拷锟斤拷锟斤拷菁锟斤拷锟揭伙拷锟窖★拷锟轿猅rue锟斤拷
num_workers: 锟斤拷锟竭程斤拷锟斤拷锟斤拷取锟斤拷锟捷诧拷锟斤拷锟斤拷0锟斤拷示只锟斤拷锟斤拷锟竭筹拷锟叫诧拷锟斤拷锟斤拷
drop_last锟斤拷锟斤拷锟斤拷锟饺★拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷欠锟斤拷锟斤拷锟斤拷剩锟铰的诧拷锟街★拷

锟斤拷锟界，锟节猴拷锟斤拷拇锟斤拷锟斤拷校锟斤拷锟斤拷锟斤拷锟斤拷 drop_last=False锟斤拷锟斤拷么一锟斤拷锟斤拷156锟斤拷锟斤拷锟斤拷锟斤拷取锟斤拷锟斤拷锟斤拷锟斤拷锟揭伙拷锟绞ｏ拷锟侥诧拷锟街诧拷锟结被锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟� drop_last=True锟斤拷锟斤拷么锟斤拷锟绞ｏ拷锟侥诧拷锟街憋拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷取锟斤拷锟斤拷也锟斤拷锟斤拷一锟轿★拷

使锟斤拷 DataLoader

锟斤拷锟斤拷使锟矫的达拷锟斤拷锟斤拷锟铰ｏ拷

    
        import torchvision
        from torch.utils.data import DataLoader
        from torch.utils.tensorboard import SummaryWriter
        test_data=torchvision.datasets.CIFAR10("dataset",train=False,transform=torchvision.transforms.ToTensor())
        test_dataloader=DataLoader(dataset=test_data,batch_size=4,shuffle=True,num_workers=0,drop_last=True)
        writer=SummaryWriter("logs")
        step=0
        for data in test_dataloader:
            images,targets=data
            writer.add_images("test_03",images,step)
            step=step+1
        writer.close()

然锟斤拷锟斤拷锟绞癸拷锟絫ensorboard锟酵匡拷锟斤拷直锟斤拷锟斤拷岬斤拷锟斤拷锟绞癸拷梅锟斤拷锟斤拷恕锟�

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