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The structure of the improved U-Net [55]: Compared with the original U-net, Wang Z. [58] has made two modifications. First, in order to reduce the amount of calculation, modify conv (3 × 3) to conv (1 × 1) + conv (3 × 3) + conv (1 × 1). In order to reduce the overall parameters, conv (3 × 3) is replaced with conv (1 × 1) when dealing with the same dimension and dimension reduction calculation.
