align default int4 configuration (#2963)

Author: eaidova

notebooks/llm-chatbot/llm-chatbot.ipynb

@@ -723,8 +723,6 @@
     "        \"qwen2.5-0.5b-instruct\": {\"sym\": True, \"group_size\": 128, \"ratio\": 1.0},\n",
     "        \"default\": {\n",
     "            \"sym\": False,\n",
-    "            \"group_size\": 128,\n",
-    "            \"ratio\": 0.8,\n",
     "        },\n",
     "    }\n",
     "\n",
@@ -733,7 +731,13 @@
     "        return\n",
     "    remote_code = model_configuration.get(\"remote_code\", False)\n",
     "    export_command_base = \"optimum-cli export openvino --model {} --task text-generation-with-past --weight-format int4\".format(pt_model_id)\n",
-    "    int4_compression_args = \" --group-size {} --ratio {}\".format(model_compression_params[\"group_size\"], model_compression_params[\"ratio\"])\n",
+    "    group_size = model_compression_params.get(\"group_size\")\n",
+    "    ratio = model_compression_params.get(\"ratio\")\n",
+    "    int4_compression_args = \"\"\n",
+    "    if group_size is not None:\n",
+    "        int4_compression_args += \" --group-size {}\".format(group_size)\n",
+    "    if ratio is not None:\n",
+    "        int4_compression_args += \" --ratio {}\".format(ratio)\n",
     "    if model_compression_params[\"sym\"]:\n",
     "        int4_compression_args += \" --sym\"\n",
     "    if enable_awq.value:\n",