pytorch利用Dataset读取数据报错问题及解决
作者：josenxiao
报错点
如下：
Traceback (most recent call last):
File "read_data.py", line 100, in <module>
for i , (image,seg) in enumerate(train_loader):
File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/dataloader.py", line 819, in __next__
return self._process_data(data)
File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/dataloader.py", line 846, in _process_data
data.reraise()
File "/usr/local/lib/python3.6/dist-packages/torch/_utils.py", line 369, in reraise
raise self.exc_type(msg)
TypeError: Caught TypeError in DataLoader worker process 0.
Original Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/worker.py", line 178, in _worker_loop
data = fetcher.fetch(index)
File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/fetch.py", line 44, in fetch
data = [self.dataset[idx] for idx in possibly_batched_index]
File "/usr/local/lib/python3.6/dist-packages/torch/utils/data/_utils/fetch.py", line 44, in <listcomp>
data = [self.dataset[idx] for idx in possibly_batched_index]
File "read_data.py", line 91, in __getitem__
])(img)
File "/usr/local/lib/python3.6/dist-packages/torchvision/transforms/transforms.py", line 61, in __call__
img = t(img)
File "/usr/local/lib/python3.6/dist-packages/torchvision/transforms/transforms.py", line 238, in __call__
return F.center_crop(img, self.size)
File "/usr/local/lib/python3.6/dist-packages/torchvision/transforms/functional.py", line 374, in center_crop
w, h = img.size
TypeError: 'int' object is not iterable
原来我其实没有注意Datset与PIL下面的Image的关系：
def __getitem__(self, index):
img = cv2.imread(self.image_name[index],cv2.COLOR_BGR2RGB)
#img = np.transpose(img,(2,1,0))
img = cv2.resize(img,(self.size,self.size))
seg = cv2.imread(self.image_seg[index],cv2.COLOR_BGR2RGB)
seg = cv2.resize(seg,(self.size,self.size) )
seg = convert_from_color_segmentation(seg)
#seg = torch.from_numpy(seg)
if self.transform is not None:
img = self.transform(img)
return img , seg报错中清晰提及这个问题
我突然反应过来，是自己的读取数据错误了：
应该为：
def __getitem__(self, index):
#img = cv2.imread(self.image_name[index],cv2.COLOR_BGR2RGB)
img = Image.open(self.image_name[index])
#img = np.transpose(img,(2,1,0))
#img = cv2.resize(img,(self.size,self.size))
seg = cv2.imread(self.image_seg[index],cv2.COLOR_BGR2RGB)
seg = cv2.resize(seg,(self.size,self.size) )
seg = convert_from_color_segmentation(seg)
#seg = torch.from_numpy(seg)
if self.transform is not None:
img = self.transform(img)
return img , seg测试打印数据
完美解决
transform = transforms.Compose([transforms.Resize((300,300)),transforms.RandomCrop((224,224)),transforms.ToTensor(),transforms.Normalize([0.485,0.456,0.406],[0.229,0.224,0.225])])
#transform = transforms.Compose([
# transforms.CenterCrop((278,278)),transforms.Resize((224,224)),transforms.ToTensor()
# ])
train_data = GetParasetData(size=224,train=True,transform=transform)
train_loader = DataLoader(train_data,batch_size=64,shuffle=True,num_workers=2)
for i , (image,seg) in enumerate(train_loader):
print(image.shape,seg.shape)
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。