Move the sigmoid activation to the model itself

Former-commit-id: e3f8ca7b1ac7c5e9694637a81be260e9b48973b9

eval.py

@@ -20,7 +20,7 @@ def eval_net(net, dataset, gpu=False):
             true_mask = true_mask.cuda()
 
         mask_pred = net(img)[0]
-        mask_pred = (F.sigmoid(mask_pred) > 0.5).float()
+        mask_pred = (mask_pred > 0.5).float()
 
         tot += dice_coeff(mask_pred, true_mask).item()
     return tot / i

predict.py

@@ -43,8 +43,8 @@ def predict_img(net,
         output_left = net(X_left)
         output_right = net(X_right)
 
-        left_probs = F.sigmoid(output_left).squeeze(0)
-        right_probs = F.sigmoid(output_right).squeeze(0)
+        left_probs = output_left.squeeze(0)
+        right_probs = output_right.squeeze(0)
 
         tf = transforms.Compose(
             [

train.py

@@ -6,7 +6,6 @@ import numpy as np
 import torch
 import torch.backends.cudnn as cudnn
 import torch.nn as nn
-import torch.nn.functional as F
 from torch import optim
 
 from eval import eval_net
@@ -74,8 +73,7 @@ def train_net(net,
                 true_masks = true_masks.cuda()
 
             masks_pred = net(imgs)
-            masks_probs = F.sigmoid(masks_pred)
-            masks_probs_flat = masks_probs.view(-1)
+            masks_probs_flat = masks_pred.view(-1)
 
             true_masks_flat = true_masks.view(-1)
 

unet/unet_model.py

@@ -1,5 +1,7 @@
 # full assembly of the sub-parts to form the complete net
 
+import torch.nn.functional as F
+
 from .unet_parts import *
 
 class UNet(nn.Module):
@@ -27,4 +29,4 @@ class UNet(nn.Module):
         x = self.up3(x, x2)
         x = self.up4(x, x1)
         x = self.outc(x)
-        return x
+        return F.sigmoid(x)