fixed training errors inside trhe script

data/training/train.py

@@ -17,6 +17,8 @@ if project_root not in sys.path:
     sys.path.insert(0, project_root)
 
 import lightning as L
+from lightning.pytorch.callbacks import ModelCheckpoint
+
 import torch
 import torch.nn.functional as F
 import torchmetrics
@@ -28,21 +30,22 @@ import mobilenetv3
 
 from lightning.pytorch.callbacks import TQDMProgressBar
 
-from lightning.pytorch.callbacks import TQDMProgressBar
-
 class EpochOnlyProgressBar(TQDMProgressBar):
+    def on_train_start(self, trainer, pl_module):
+        super().on_train_start(trainer, pl_module)
+    
     def on_train_batch_end(self, trainer, pl_module, outputs, batch, batch_idx, dataloader_idx):
-        # Disable batch progress updates (no updates on each batch)
+        # Disable batch progress updates
         pass
 
     def on_train_epoch_end(self, trainer, pl_module):
-        # Complete and close progress bar for the epoch
-        self.main_progress_bar.update(self.main_progress_bar.total - self.main_progress_bar.n)
-        self.main_progress_bar.close()
+        # Update and close progress bar at epoch end
+        if self.main_progress_bar is not None:
+            self.main_progress_bar.update(self.main_progress_bar.total - self.main_progress_bar.n)
+            self.main_progress_bar.close()
 
-        epoch = trainer.current_epoch + 1  # epochs start at 0 internally
+        epoch = trainer.current_epoch + 1  # zero-based to one-based
 
-        # Fetch logged metrics safely
         train_loss = trainer.callback_metrics.get("train_loss")
         val_loss = trainer.callback_metrics.get("val_loss")
         val_acc = trainer.callback_metrics.get("val_acc")
@@ -160,7 +163,7 @@ def train_model():
         )
     )
 
-    checkpoint_callback = L.pytorch.callbacks.ModelCheckpoint(
+    checkpoint_callback = ModelCheckpoint(
         dirpath=checkpoint_dir,
         filename=checkpoint_filename,
         save_top_k=True,
@@ -180,7 +183,7 @@ def train_model():
         benchmark=True,
         precision="bf16-mixed",
         logger=False,
-        enable_progress_bar=False,
+        enable_progress_bar=True,
     )
 
     if train_flag: