Fix modifiers initialization: ensure it's always defined

- Initialize modifiers and quant_config to None
- Ensure modifiers is always created before use
- Add final fallback to default AWQModifier if all config approaches fail

quantize_to_awq_colab.ipynb

@@ -258,6 +258,9 @@
         "        # Try multiple approaches to create the config\n",
         "        print(f\"  → Creating quantization config for 4-bit AWQ...\")\n",
         "        \n",
+        "        modifiers = None\n",
+        "        quant_config = None\n",
+        "        \n",
         "        try:\n",
         "            # Approach 1: Try importing BaseQuantizationConfig\n",
         "            from compressed_tensors.quantization import QuantizationConfig, BaseQuantizationConfig\n",
@@ -288,16 +291,21 @@
         "            except Exception as e:\n",
         "                # Approach 3: Try AWQModifier without quantization_config (use defaults)\n",
         "                print(f\"  ⚠️ Could not create QuantizationConfig: {e}\")\n",
-        "                print(f\"  → Trying AWQModifier with default settings...\")\n",
+        "                print(f\"  → Using AWQModifier with default settings...\")\n",
         "                modifiers = [AWQModifier()]\n",
         "                print(f\"  ✅ AWQModifier created with default settings\")\n",
-        "                # Skip quantization_config creation and use default AWQModifier\n",
-        "                quant_config = None\n",
         "        \n",
-        "        if quant_config is not None:\n",
-        "            print(f\"  → Creating AWQModifier with quantization config...\")\n",
-        "            modifiers = [AWQModifier(quantization_config=quant_config)]\n",
-        "            print(f\"  ✅ AWQModifier created successfully\")\n",
+        "        # Create modifiers if we have a quant_config\n",
+        "        if modifiers is None:\n",
+        "            if quant_config is not None:\n",
+        "                print(f\"  → Creating AWQModifier with quantization config...\")\n",
+        "                modifiers = [AWQModifier(quantization_config=quant_config)]\n",
+        "                print(f\"  ✅ AWQModifier created successfully\")\n",
+        "            else:\n",
+        "                # Final fallback: use default AWQModifier\n",
+        "                print(f\"  → Using AWQModifier with default settings (no config)...\")\n",
+        "                modifiers = [AWQModifier()]\n",
+        "                print(f\"  ✅ AWQModifier created with default settings\")\n",
         "        \n",
         "        # Call oneshot with the modifier\n",
         "        print(f\"  → Starting quantization process...\")\n",