[英]how to add transformation in pytorch object detection
我是 PyTorch 的新手,正在浏览 PyTorch 对象检测文档教程pytorch docx 。 在他们的合作版本中,我进行了以下更改以添加一些转换技术。
__getitem__
方法if self.transforms is not None:
img = self.transforms(img)
target = T.ToTensor()(target)
return img, target
In actual documentation it is
if self.transforms is not None:
img, target = self.transforms(img, target)
其次,在get_transform(train)
函数处。
def get_transform(train):
if train:
transformed = T.Compose([
T.ToTensor(),
T.GaussianBlur(kernel_size=5, sigma=(0.1, 2.0)),
T.ColorJitter(brightness=[0.1, 0.2], contrast=[0.1, 0.2], saturation=[0, 0.2], hue=[0,0.5])
])
return transformed
else:
return T.ToTensor()
**In the documentation it is-**
def get_transform(train):
transforms = []
transforms.append(T.ToTensor())
if train:
transforms.append(T.RandomHorizontalFlip(0.5))
return T.Compose(transforms)
在实现代码时,我收到以下错误。 我无法得到我做错了什么。
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 198, 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 "/usr/local/lib/python3.6/dist-packages/torch/utils/data/dataset.py", line 272, in __getitem__
return self.dataset[self.indices[idx]]
File "<ipython-input-41-94e93ff7a132>", line 72, in __getitem__
target = T.ToTensor()(target)
File "/usr/local/lib/python3.6/dist-packages/torchvision/transforms/transforms.py", line 104, in __call__
return F.to_tensor(pic)
File "/usr/local/lib/python3.6/dist-packages/torchvision/transforms/functional.py", line 64, in to_tensor
raise TypeError('pic should be PIL Image or ndarray. Got {}'.format(type(pic)))
TypeError: pic should be PIL Image or ndarray. Got <class 'dict'>
我相信 Pytorch 转换仅适用于图像(在这种情况下为 PIL 图像或 np 数组),而不适用于标签(根据跟踪是字典)。 因此,我认为您不需要像在__getitem__
函数中的这一行target = T.ToTensor()(target)
那样“张量化”标签。
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