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model.py
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model.py
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import torch.nn as nn
import torch
class Modified3DUNet(nn.Module):
def __init__(self, in_channels, n_classes, base_n_filter = 8):
super(Modified3DUNet, self).__init__()
self.in_channels = in_channels
self.n_classes = n_classes
self.base_n_filter = base_n_filter
self.lrelu = nn.LeakyReLU()
self.dropout3d = nn.Dropout3d(p=0.6)
self.upsacle = nn.Upsample(scale_factor=2, mode='nearest')
self.softmax = nn.Softmax(dim=1)
# Level 1 context pathway
self.conv3d_c1_1 = nn.Conv3d(self.in_channels, self.base_n_filter, kernel_size=3, stride=1, padding=1, bias=False)
self.conv3d_c1_2 = nn.Conv3d(self.base_n_filter, self.base_n_filter, kernel_size=3, stride=1, padding=1, bias=False)
self.lrelu_conv_c1 = self.lrelu_conv(self.base_n_filter, self.base_n_filter)
self.inorm3d_c1 = nn.InstanceNorm3d(self.base_n_filter)
# Level 2 context pathway
self.conv3d_c2 = nn.Conv3d(self.base_n_filter, self.base_n_filter*2, kernel_size=3, stride=2, padding=1, bias=False)
self.norm_lrelu_conv_c2 = self.norm_lrelu_conv(self.base_n_filter*2, self.base_n_filter*2)
self.inorm3d_c2 = nn.InstanceNorm3d(self.base_n_filter*2)
# Level 3 context pathway
self.conv3d_c3 = nn.Conv3d(self.base_n_filter*2, self.base_n_filter*4, kernel_size=3, stride=2, padding=1, bias=False)
self.norm_lrelu_conv_c3 = self.norm_lrelu_conv(self.base_n_filter*4, self.base_n_filter*4)
self.inorm3d_c3 = nn.InstanceNorm3d(self.base_n_filter*4)
# Level 4 context pathway
self.conv3d_c4 = nn.Conv3d(self.base_n_filter*4, self.base_n_filter*8, kernel_size=3, stride=2, padding=1, bias=False)
self.norm_lrelu_conv_c4 = self.norm_lrelu_conv(self.base_n_filter*8, self.base_n_filter*8)
self.inorm3d_c4 = nn.InstanceNorm3d(self.base_n_filter*8)
# Level 5 context pathway, level 0 localization pathway
self.conv3d_c5 = nn.Conv3d(self.base_n_filter*8, self.base_n_filter*16, kernel_size=3, stride=2, padding=1, bias=False)
self.norm_lrelu_conv_c5 = self.norm_lrelu_conv(self.base_n_filter*16, self.base_n_filter*16)
self.norm_lrelu_upscale_conv_norm_lrelu_l0 = self.norm_lrelu_upscale_conv_norm_lrelu(self.base_n_filter*16, self.base_n_filter*8)
self.conv3d_l0 = nn.Conv3d(self.base_n_filter*8, self.base_n_filter*8, kernel_size = 1, stride=1, padding=0, bias=False)
self.inorm3d_l0 = nn.InstanceNorm3d(self.base_n_filter*8)
# Level 1 localization pathway
self.conv_norm_lrelu_l1 = self.conv_norm_lrelu(self.base_n_filter*16, self.base_n_filter*16)
self.conv3d_l1 = nn.Conv3d(self.base_n_filter*16, self.base_n_filter*8, kernel_size=1, stride=1, padding=0, bias=False)
self.norm_lrelu_upscale_conv_norm_lrelu_l1 = self.norm_lrelu_upscale_conv_norm_lrelu(self.base_n_filter*8, self.base_n_filter*4)
# Level 2 localization pathway
self.conv_norm_lrelu_l2 = self.conv_norm_lrelu(self.base_n_filter*8, self.base_n_filter*8)
self.conv3d_l2 = nn.Conv3d(self.base_n_filter*8, self.base_n_filter*4, kernel_size=1, stride=1, padding=0, bias=False)
self.norm_lrelu_upscale_conv_norm_lrelu_l2 = self.norm_lrelu_upscale_conv_norm_lrelu(self.base_n_filter*4, self.base_n_filter*2)
# Level 3 localization pathway
self.conv_norm_lrelu_l3 = self.conv_norm_lrelu(self.base_n_filter*4, self.base_n_filter*4)
self.conv3d_l3 = nn.Conv3d(self.base_n_filter*4, self.base_n_filter*2, kernel_size=1, stride=1, padding=0, bias=False)
self.norm_lrelu_upscale_conv_norm_lrelu_l3 = self.norm_lrelu_upscale_conv_norm_lrelu(self.base_n_filter*2, self.base_n_filter)
# Level 4 localization pathway
self.conv_norm_lrelu_l4 = self.conv_norm_lrelu(self.base_n_filter*2, self.base_n_filter*2)
self.conv3d_l4 = nn.Conv3d(self.base_n_filter*2, self.n_classes, kernel_size=1, stride=1, padding=0, bias=False)
self.ds2_1x1_conv3d = nn.Conv3d(self.base_n_filter*8, self.n_classes, kernel_size=1, stride=1, padding=0, bias=False)
self.ds3_1x1_conv3d = nn.Conv3d(self.base_n_filter*4, self.n_classes, kernel_size=1, stride=1, padding=0, bias=False)
def conv_norm_lrelu(self, feat_in, feat_out):
return nn.Sequential(
nn.Conv3d(feat_in, feat_out, kernel_size=3, stride=1, padding=1, bias=False),
nn.InstanceNorm3d(feat_out),
nn.LeakyReLU())
def norm_lrelu_conv(self, feat_in, feat_out):
return nn.Sequential(
nn.InstanceNorm3d(feat_in),
nn.LeakyReLU(),
nn.Conv3d(feat_in, feat_out, kernel_size=3, stride=1, padding=1, bias=False))
def lrelu_conv(self, feat_in, feat_out):
return nn.Sequential(
nn.LeakyReLU(),
nn.Conv3d(feat_in, feat_out, kernel_size=3, stride=1, padding=1, bias=False))
def norm_lrelu_upscale_conv_norm_lrelu(self, feat_in, feat_out):
return nn.Sequential(
nn.InstanceNorm3d(feat_in),
nn.LeakyReLU(),
nn.Upsample(scale_factor=2, mode='nearest'),
# should be feat_in*2 or feat_in
nn.Conv3d(feat_in, feat_out, kernel_size=3, stride=1, padding=1, bias=False),
nn.InstanceNorm3d(feat_out),
nn.LeakyReLU())
def forward(self, x):
# Level 1 context pathway
out = self.conv3d_c1_1(x)
residual_1 = out
out = self.lrelu(out)
out = self.conv3d_c1_2(out)
out = self.dropout3d(out)
out = self.lrelu_conv_c1(out)
# Element Wise Summation
out += residual_1
context_1 = self.lrelu(out)
out = self.inorm3d_c1(out)
out = self.lrelu(out)
# Level 2 context pathway
out = self.conv3d_c2(out)
residual_2 = out
out = self.norm_lrelu_conv_c2(out)
out = self.dropout3d(out)
out = self.norm_lrelu_conv_c2(out)
out += residual_2
out = self.inorm3d_c2(out)
out = self.lrelu(out)
context_2 = out
# Level 3 context pathway
out = self.conv3d_c3(out)
residual_3 = out
out = self.norm_lrelu_conv_c3(out)
out = self.dropout3d(out)
out = self.norm_lrelu_conv_c3(out)
out += residual_3
out = self.inorm3d_c3(out)
out = self.lrelu(out)
context_3 = out
# Level 4 context pathway
out = self.conv3d_c4(out)
residual_4 = out
out = self.norm_lrelu_conv_c4(out)
out = self.dropout3d(out)
out = self.norm_lrelu_conv_c4(out)
out += residual_4
out = self.inorm3d_c4(out)
out = self.lrelu(out)
context_4 = out
# Level 5
out = self.conv3d_c5(out)
residual_5 = out
out = self.norm_lrelu_conv_c5(out)
out = self.dropout3d(out)
out = self.norm_lrelu_conv_c5(out)
out += residual_5
out = self.norm_lrelu_upscale_conv_norm_lrelu_l0(out)
out = self.conv3d_l0(out)
out = self.inorm3d_l0(out)
out = self.lrelu(out)
# Level 1 localization pathway
out = torch.cat([out, context_4], dim=1)
out = self.conv_norm_lrelu_l1(out)
out = self.conv3d_l1(out)
out = self.norm_lrelu_upscale_conv_norm_lrelu_l1(out)
# Level 2 localization pathway
out = torch.cat([out, context_3], dim=1)
out = self.conv_norm_lrelu_l2(out)
ds2 = out
out = self.conv3d_l2(out)
out = self.norm_lrelu_upscale_conv_norm_lrelu_l2(out)
# Level 3 localization pathway
out = torch.cat([out, context_2], dim=1)
out = self.conv_norm_lrelu_l3(out)
ds3 = out
out = self.conv3d_l3(out)
out = self.norm_lrelu_upscale_conv_norm_lrelu_l3(out)
# Level 4 localization pathway
out = torch.cat([out, context_1], dim=1)
out = self.conv_norm_lrelu_l4(out)
out_pred = self.conv3d_l4(out)
ds2_1x1_conv = self.ds2_1x1_conv3d(ds2)
ds1_ds2_sum_upscale = self.upsacle(ds2_1x1_conv)
ds3_1x1_conv = self.ds3_1x1_conv3d(ds3)
ds1_ds2_sum_upscale_ds3_sum = ds1_ds2_sum_upscale + ds3_1x1_conv
ds1_ds2_sum_upscale_ds3_sum_upscale = self.upsacle(ds1_ds2_sum_upscale_ds3_sum)
out = out_pred + ds1_ds2_sum_upscale_ds3_sum_upscale
seg_layer = out
out = out.permute(0, 2, 3, 4, 1).contiguous().view(-1, self.n_classes)
#out = out.view(-1, self.n_classes)
out = self.softmax(out)
return out, seg_layer