img_tensor=torch.unsqueeze(img_tensor,0)
时间: 2023-10-28 11:05:05 浏览: 208
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This line of code adds an extra dimension to the tensor `img_tensor` at index 0, effectively creating a batch of size 1.
In PyTorch, most deep learning models expect input data to be in the form of batches. Adding an extra dimension at index 0 allows the model to treat the input as a batch of size 1, which is useful for evaluating a single input image or for testing a model during development.
The resulting tensor will have a shape of `(1, C, H, W)`, where `C` is the number of channels, `H` is the height, and `W` is the width of the original image tensor.
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