python報錯：1only batches of spatial targets supported (non-empty 3D tensors) but got targets of size
因為在使用Crossentropyloss作為損失函數時，output=net(input)的output應該是[batchsize, channel, height, weight]，而label則 ...
原文：RuntimeError: 1only batches of spatial targets supported (non-empty 3D tensors) but got targets of size
原因：這個原因是因為在使用Crossentropyloss作為損失函數時，output net input 的output應該是 batchsize, n class, height, weight ，而label則是 batchsize, height, weight ，label是單通道灰度圖 BCELoss與CrossEntropyLoss都是用於分類問題。BCELoss是CrossEntr ...
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