Cast user_id as string in notebook

Author: brightsparc

notebook/mab-reviews-helpfulness.ipynb

@@ -1393,7 +1393,7 @@
     "\n",
     "def api_invocation(user_id, text_array):\n",
     "    payload = {\n",
-    "        \"user_id\": user_id,\n",
+    "        \"user_id\": str(user_id),\n",
     "        \"endpoint_name\": endpoint_name, \n",
     "        \"content_type\": \"application/json\",\n",
     "        \"data\": json.dumps({\"instances\" : text_array, \"configuration\": { \"k\": 1 }}), \n",
@@ -1856,4 +1856,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 4
-}
+}