Fix model loading error handling and lambda function warnings

- Add better error handling for TTS model loading with alternative methods
- Fix lambda function warnings by using proper function factory
- Update requirements.txt to constrain Gradio version

app.py

@@ -13,12 +13,39 @@ from pathlib import Path
 MODEL_NAME = "ashishkblink/vakya"
 
 print("🚀 Loading Vakya TTS model...")
+tts = None
 try:
-    tts = TTS(model_name=MODEL_NAME)
+    # Try loading with explicit model name
+    tts = TTS(model_name=MODEL_NAME, progress_bar=True)
     print("✅ Model loaded successfully!")
+except ValueError as e:
+    # This might be the unpacking error - try with explicit model type
+    print(f"⚠️ Initial load failed (ValueError): {e}")
+    print("🔄 Trying with explicit model type...")
+    try:
+        # XTTS models might need explicit specification
+        tts = TTS(model_name=MODEL_NAME, model_type="tts_models/multilingual/multi-dataset/xtts_v2", progress_bar=True)
+        print("✅ Model loaded successfully with explicit type!")
+    except Exception as e2:
+        print(f"❌ Explicit type loading failed: {e2}")
+        import traceback
+        traceback.print_exc()
+        tts = None
 except Exception as e:
     print(f"❌ Error loading model: {e}")
-    tts = None
+    import traceback
+    traceback.print_exc()
+    # Try alternative initialization methods
+    try:
+        print("🔄 Trying alternative model loading method...")
+        # Try with gpu parameter explicitly set
+        tts = TTS(model_name=MODEL_NAME, gpu=False, progress_bar=True)
+        print("✅ Model loaded successfully with alternative method!")
+    except Exception as e2:
+        print(f"❌ Alternative loading also failed: {e2}")
+        import traceback
+        traceback.print_exc()
+        tts = None
 
 # Supported languages for Indian languages
 INDIAN_LANGUAGES = {
@@ -189,26 +216,36 @@ with gr.Blocks(css=css, theme=gr.themes.Soft()) as demo:
     # Examples section
     gr.Markdown("### 📚 Example Texts (Click to use)")
     
+    def make_example_loader(example_text, lang_name):
+        """Create a function to load example text and language"""
+        def load_example():
+            return example_text, lang_name
+        return load_example
+    
     with gr.Row():
         for lang_name, lang_code in list(INDIAN_LANGUAGES.items())[:5]:
             example_text = EXAMPLE_TEXTS.get(lang_code, "")
-            gr.Button(
+            example_btn = gr.Button(
                 f"{lang_name} Example",
                 size="sm"
-            ).click(
-                fn=lambda txt=example_text, lang=lang_name: (txt, lang),
-                outputs=[text_input, language_dropdown]
+            )
+            example_btn.click(
+                fn=make_example_loader(example_text, lang_name),
+                outputs=[text_input, language_dropdown],
+                api_name=f"load_example_{lang_name.lower().replace(' ', '_')}"
             )
     
     with gr.Row():
         for lang_name, lang_code in list(INDIAN_LANGUAGES.items())[5:]:
             example_text = EXAMPLE_TEXTS.get(lang_code, "")
-            gr.Button(
+            example_btn = gr.Button(
                 f"{lang_name} Example",
                 size="sm"
-            ).click(
-                fn=lambda txt=example_text, lang=lang_name: (txt, lang),
-                outputs=[text_input, language_dropdown]
+            )
+            example_btn.click(
+                fn=make_example_loader(example_text, lang_name),
+                outputs=[text_input, language_dropdown],
+                api_name=f"load_example_{lang_name.lower().replace(' ', '_')}"
             )
     
     # Footer

requirements.txt

@@ -1,5 +1,5 @@
 TTS>=0.22.0
-gradio>=4.0.0
+gradio>=4.0.0,<5.0.0
 torch>=2.0.0
 torchaudio>=2.0.0
 numpy>=1.21.0