better validation total time output

src/common/validation.py

@@ -5,6 +5,7 @@ from common.utils import PSNR, cal_ssim, logger_info, _rgb2ycbcr, modcrop
 from pathlib import Path
 from PIL import Image
 import time
+from datetime import timedelta
 
 def val_image_pair(model, hr_image, lr_image, output_image_path=None, device='cuda'):            
     with torch.inference_mode():
@@ -70,7 +71,7 @@ def valid_steps(model, datasets, config, log_prefix=""):
             len(test_dataset),
             np.mean(lr_areas),
             total_area,
-            total_time
+            timedelta(seconds=total_time)
         ]
         results.append(row)
         column_names = [
@@ -82,7 +83,7 @@ def valid_steps(model, datasets, config, log_prefix=""):
             'Image count',
             'AVG image area',
             'Total area',
-            'Total time, s'
+            'Total time'
         ]
         config.logger.info("\n" + str(pd.DataFrame([row], columns=column_names).set_index('Dataset').T))
         config.writer.flush()