unet_model.py

# -*- coding: utf-8 -*-
"""
@author: ZHANG Min, Wuhan University
@email: 007zhangmin@whu.edu.cn
"""

from unet_parts import *


class UNet(nn.Module):
    def __init__(self, n_channels):
        super(UNet, self).__init__()
        self.n_channels = n_channels
        self.inc = DoubleConv(n_channels, 64)
        self.down1 = Down(64, 128)
        self.down2 = Down(128, 256)
        self.down3 = Down(256, 512)
        self.down4 = Down(512, 512)
        self.up1 = Up(1024, 256)
        self.up2 = Up(512, 128)
        self.up3 = Up(256, 64)
        self.up4 = Up(128, 64)

    def forward(self, x):
        x1 = self.inc(x)
        x2 = self.down1(x1)
        x3 = self.down2(x2)
        x4 = self.down3(x3)
        x5 = self.down4(x4)
        x = self.up1(x5, x4)
        x = self.up2(x, x3)
        x = self.up3(x, x2)
        x = self.up4(x, x1)
        return x