Fix: Use gr.update() instead of gr.Slider() to avoid JSON schema bug

requirements.txt

@@ -4,8 +4,8 @@
 # =============================================================================
 # Core Web Framework
 # =============================================================================
-# Gradio 5.x has fixed the JSON schema serialization bugs
-gradio>=5.0.0,<6.0.0
+# Gradio - compatible with HF Spaces (5.x is pre-installed on HF)
+gradio>=5.0.0
 
 # =============================================================================
 # Medical Imaging I/O

seg_app/ui/gradio_app.py

@@ -44,7 +44,7 @@ _current_prompts: Prompts = Prompts()
 _prompt_mode: str = "positive"  # "positive" or "negative"
 
 
-def load_volume(file) -> Tuple[Image.Image, Image.Image, Image.Image, str, str, gr.Slider, gr.Slider, gr.Slider]:
+def load_volume(file) -> Tuple[Image.Image, Image.Image, Image.Image, str, str, dict, dict, dict]:
     """Load a NIfTI volume and render initial multi-planar views.
     
     Args:
@@ -52,20 +52,16 @@ def load_volume(file) -> Tuple[Image.Image, Image.Image, Image.Image, str, str,
         
     Returns:
         Tuple of (axial_image, sagittal_image, coronal_image, volume_info_str, 
-                  metrics_str, axial_slider, sagittal_slider, coronal_slider)
+                  metrics_str, axial_slider_update, sagittal_slider_update, coronal_slider_update)
     """
     global _current_volume, _current_mask, _current_slice_indices, _current_prompts
     
-    # Default slider values for error cases
-    default_sliders = (
-        gr.Slider(minimum=0, maximum=100, value=50, step=1),
-        gr.Slider(minimum=0, maximum=100, value=50, step=1),
-        gr.Slider(minimum=0, maximum=100, value=50, step=1),
-    )
+    # Default slider updates for error cases (use gr.update() for compatibility)
+    default_slider_update = gr.update(minimum=0, maximum=100, value=50)
     
     if file is None:
         gr.Warning("Please upload a NIfTI file (.nii or .nii.gz)")
-        return None, None, None, "", "", *default_sliders
+        return None, None, None, "", "", default_slider_update, default_slider_update, default_slider_update
     
     # Handle Gradio file input (could be path string or file object)
     filepath = file.name if hasattr(file, 'name') else file
@@ -74,7 +70,7 @@ def load_volume(file) -> Tuple[Image.Image, Image.Image, Image.Image, str, str,
         _current_volume = load_nifti(filepath)
     except Exception as e:
         gr.Warning(f"Failed to load NIfTI file: {e}")
-        return None, None, None, "", "", *default_sliders
+        return None, None, None, "", "", default_slider_update, default_slider_update, default_slider_update
     
     # Clear previous segmentation and prompts
     _current_mask = None
@@ -101,10 +97,10 @@ def load_volume(file) -> Tuple[Image.Image, Image.Image, Image.Image, str, str,
     spacing = tuple(round(s, 2) for s in _current_volume.spacing)
     volume_info_str = f"Shape: {shape}\nSpacing: {spacing} mm"
     
-    # Create updated sliders
-    axial_slider = gr.Slider(minimum=ax_min, maximum=ax_max, value=view.axial.index, step=1)
-    sagittal_slider = gr.Slider(minimum=sag_min, maximum=sag_max, value=view.sagittal.index, step=1)
-    coronal_slider = gr.Slider(minimum=cor_min, maximum=cor_max, value=view.coronal.index, step=1)
+    # Create slider updates using gr.update() - compatible with all Gradio versions
+    axial_slider_update = gr.update(minimum=ax_min, maximum=ax_max, value=view.axial.index)
+    sagittal_slider_update = gr.update(minimum=sag_min, maximum=sag_max, value=view.sagittal.index)
+    coronal_slider_update = gr.update(minimum=cor_min, maximum=cor_max, value=view.coronal.index)
     
     return (
         view.axial.image,
@@ -112,9 +108,9 @@ def load_volume(file) -> Tuple[Image.Image, Image.Image, Image.Image, str, str,
         view.coronal.image,
         volume_info_str,
         "",  # Clear metrics
-        axial_slider,
-        sagittal_slider,
-        coronal_slider,
+        axial_slider_update,
+        sagittal_slider_update,
+        coronal_slider_update,
     )