From f99ce1d024e8050ba6e274504f77c21c7136a178 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=91=9B=E5=B3=BB=E6=81=BA?= <202115006@mail.sdu.edu.cn>
Date: Tue, 2 Sep 2025 12:06:37 +0000
Subject: [PATCH] update utils/train_val_lr.py.
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Signed-off-by: 葛峻恺 <202115006@mail.sdu.edu.cn>
---
 utils/train_val_lr.py | 64 +++++++++++++++++++++++++++++--------------
 1 file changed, 44 insertions(+), 20 deletions(-)

diff --git a/utils/train_val_lr.py b/utils/train_val_lr.py
index c7ec6dc..3f7ead1 100644
--- a/utils/train_val_lr.py
+++ b/utils/train_val_lr.py
@@ -8,56 +8,80 @@ from torchvision.utils import make_grid, save_image
 sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
 from config import Network_train_Config as cfg
 
+
 # Training function
 def train(train_loader, model, loss_func, optimizer, epoch):
     model.train()
-    total_loss = 0
+    total_loss_sum = 0.0
+    primary_loss_sum = 0.0
+    cycle_loss_sum = 0.0
     batch_count = 0
 
     for data, label in train_loader:
-        data = data.cuda()
-        label = label.cuda()
+        data = data.cuda(non_blocking=True).float()
+        label = label.cuda(non_blocking=True).float()
 
-        output = model(data.type(torch.cuda.FloatTensor))
-        loss = loss_func(output.float(), label.float())
+        # Forward pass with cycle; both primary loss and cycle loss are handled in the model
+        pred, recon = model.forward_with_cycle(data)
+        losses = model.compute_loss(data, label, pred, recon)  # returns dict with {'total','primary','cycle'}
+        loss = losses['total']
 
-        total_loss += loss.item()
-        optimizer.zero_grad()
+        optimizer.zero_grad(set_to_none=True)
         loss.backward()
         optimizer.step()
+
+        total_loss_sum   += loss.item()
+        primary_loss_sum += losses['primary'].item()
+        cycle_loss_sum   += losses['cycle'].item()
         batch_count += 1
 
-    avg_loss = total_loss / batch_count
-    print(f"Epoch {epoch}: Training Loss = {avg_loss:.6f}")
-    return avg_loss
+    avg_total   = total_loss_sum   / max(batch_count, 1)
+    avg_primary = primary_loss_sum / max(batch_count, 1)
+    avg_cycle   = cycle_loss_sum   / max(batch_count, 1)
+
+    # Print the three loss components (total, primary, cycle) for monitoring balance
+    print(f"Epoch {epoch}: Training -> total={avg_total:.6f} | primary={avg_primary:.6f} | cycle={avg_cycle:.6f}")
+    return avg_total  # Keep compatibility with original script: return total loss
+
 
 # Validation function
 def validate(val_loader, model, loss_func):
     model.eval()
-    total_loss = 0
+    total_loss_sum = 0.0
+    primary_loss_sum = 0.0
+    cycle_loss_sum = 0.0
     batch_count = 0
 
     with torch.no_grad():
         for data, label in val_loader:
-            data = data.cuda()
-            label = label.cuda()
+            data = data.cuda(non_blocking=True).float()
+            label = label.cuda(non_blocking=True).float()
 
-            output = model(data.type(torch.cuda.FloatTensor))
-            loss = loss_func(output.float(), label.float())
+            pred, recon = model.forward_with_cycle(data)
+            losses = model.compute_loss(data, label, pred, recon)
 
-            total_loss += loss.item()
+            total_loss_sum   += losses['total'].item()
+            primary_loss_sum += losses['primary'].item()
+            cycle_loss_sum   += losses['cycle'].item()
             batch_count += 1
 
-    avg_loss = total_loss / batch_count
-    return avg_loss
+    avg_total   = total_loss_sum   / max(batch_count, 1)
+    avg_primary = primary_loss_sum / max(batch_count, 1)
+    avg_cycle   = cycle_loss_sum   / max(batch_count, 1)
+
+    # Print validation losses
+    print(f"Validation  : total={avg_total:.6f} | primary={avg_primary:.6f} | cycle={avg_cycle:.6f}")
+    return avg_total
+
 
 # Learning rate scheduler
 def adjust_learning_rate(optimizer, epoch, start_lr):
-    """Exponentially decays learning rate based on epoch and configured decay rate."""
-    lr = start_lr * (cfg.lr_decrease_rate ** epoch)
+    """Exponentially decay learning rate based on epoch and configured decay rate."""
+    lr = start_lr * cfg.lr_decrease_rate
     for param_group in optimizer.param_groups:
         param_group['lr'] = lr
     return lr
 
 
 
+