DOWNGRADE FIX: Rollback to Gradio 4.38.1 + Robust Launch

- Downgrade to gradio==4.38.1 to avoid schema bug in 4.44.0
- Use simple gr.Interface with flagging_mode='never'
- Add multi-tier error handling for different environments
- Progressive fallback: default -> share=True -> server config
- This should resolve the persistent TypeError bool iteration issue
- Reference: GitHub issue #4046 about localhost accessibility

app.py

@@ -61,26 +61,30 @@ def predict_sign_language(image):
     except Exception as e:
         return f"❌ 處理錯誤: {str(e)}"
 
-# 創建最基本的Blocks介面來避開Interface的schema問題
-with gr.Blocks(title="SignView2.0 - 手語辨識系統") as demo:
-    gr.Markdown("# 🤟 SignView2.0 - 手語辨識系統")
-    gr.Markdown("支援34種手語詞彙的即時辨識系統，準確率達94.25%")
-    gr.Markdown("上傳影像即可開始辨識手語動作")
-    
-    with gr.Row():
-        image_input = gr.Image()
-        text_output = gr.Textbox(label="辨識結果", lines=10)
-    
-    image_input.change(predict_sign_language, inputs=image_input, outputs=text_output)
+# 使用最簡單的Interface避開所有schema問題
+demo = gr.Interface(
+    fn=predict_sign_language,
+    inputs=gr.Image(),
+    outputs=gr.Textbox(lines=10),
+    title="🤟 SignView2.0 - 手語辨識系統",
+    description="支援34種手語詞彙的即時辨識系統，準確率達94.25%\n\n上傳影像即可開始辨識手語動作",
+    flagging_mode="never"
+)
 
 if __name__ == "__main__":
     print("🎉 SignView2.0 手語辨識系統已啟動！")
     
-    # 針對Hugging Face Spaces的特殊配置
+    # 根據環境自動選擇最佳配置
     import os
-    if os.environ.get("SPACE_ID"):
-        # 在Hugging Face Spaces上運行
-        demo.launch(server_name="0.0.0.0", server_port=7860)
-    else:
-        # 本地運行
-        demo.launch(share=True) 
+    try:
+        # 嘗試最簡單的launch，讓Gradio自己處理
+        demo.launch()
+    except Exception as e:
+        print(f"預設啟動失敗，嘗試備用方案: {e}")
+        try:
+            # 如果在Spaces環境，強制使用share=True
+            demo.launch(share=True)
+        except Exception as e2:
+            print(f"備用方案也失敗: {e2}")
+            # 最後嘗試基本配置
+            demo.launch(server_name="0.0.0.0", server_port=7860, share=False) 

requirements.txt

@@ -1,4 +1,4 @@
-gradio==4.44.0
+gradio==4.38.1
 torch>=2.0.0
 torchvision>=0.15.0
 opencv-python>=4.8.0