Why is there only 19 categories in cityscapes_names.txt and no background categories?

hszhao / semseg

Semantic Segmentation in Pytorch

MIT License

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Why is there only 19 categories in cityscapes_names.txt and no background categories? #57

Open Dumbledore-bit opened 4 years ago

Dumbledore-bit commented 4 years ago

Thank for your contribution！And I have some questions I want to ask you。 Why is there only 19 categories in cityscapes_colors.txt and no background categories? Why is it not necessary to calculate the loss function of the background class in calculating the loss function?