langchain/docs/modules/chains/examples/graph_nebula_qa.ipynb

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   "id": "c94240f5",
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   "source": [
    "# NebulaGraphQAChain\n",
    "\n",
    "This notebook shows how to use LLMs to provide a natural language interface to NebulaGraph database."
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "dbc0ee68",
   "metadata": {},
   "source": [
    "You will need to have a running NebulaGraph cluster, for which you can run a containerized cluster by running the following script:\n",
    "\n",
    "```bash\n",
    "curl -fsSL nebula-up.siwei.io/install.sh | bash\n",
    "```\n",
    "\n",
    "Other options are:\n",
    "- Install as a [Docker Desktop Extension](https://www.docker.com/blog/distributed-cloud-native-graph-database-nebulagraph-docker-extension/). See [here](https://docs.nebula-graph.io/3.5.0/2.quick-start/1.quick-start-workflow/)\n",
    "- NebulaGraph Cloud Service. See [here](https://www.nebula-graph.io/cloud)\n",
    "- Deploy from package, source code, or via Kubernetes. See [here](https://docs.nebula-graph.io/)\n",
    "\n",
    "Once the cluster is running, we could create the SPACE and SCHEMA for the database."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c82f4141",
   "metadata": {},
   "outputs": [],
   "source": [
    "%pip install ipython-ngql\n",
    "%load_ext ngql\n",
    "\n",
    "# connect ngql jupyter extension to nebulagraph\n",
    "%ngql --address 127.0.0.1 --port 9669 --user root --password nebula\n",
    "# create a new space\n",
    "%ngql CREATE SPACE IF NOT EXISTS langchain(partition_num=1, replica_factor=1, vid_type=fixed_string(128));\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "eda0809a",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Wait for a few seconds for the space to be created.\n",
    "%ngql USE langchain;"
   ]
  },
  {
   "attachments": {},
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   "id": "119fe35c",
   "metadata": {},
   "source": [
    "Create the schema, for full dataset, refer [here](https://www.siwei.io/en/nebulagraph-etl-dbt/)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5aa796ee",
   "metadata": {},
   "outputs": [],
   "source": [
    "%%ngql\n",
    "CREATE TAG IF NOT EXISTS movie(name string);\n",
    "CREATE TAG IF NOT EXISTS person(name string, birthdate string);\n",
    "CREATE EDGE IF NOT EXISTS acted_in();\n",
    "CREATE TAG INDEX IF NOT EXISTS person_index ON person(name(128));\n",
    "CREATE TAG INDEX IF NOT EXISTS movie_index ON movie(name(128));"
   ]
  },
  {
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   "id": "66e4799a",
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   "source": [
    "Wait for schema creation to complete, then we can insert some data."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "d8eea530",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "UsageError: Cell magic `%%ngql` not found.\n"
     ]
    }
   ],
   "source": [
    "%%ngql\n",
    "INSERT VERTEX person(name, birthdate) VALUES \"Al Pacino\":(\"Al Pacino\", \"1940-04-25\");\n",
    "INSERT VERTEX movie(name) VALUES \"The Godfather II\":(\"The Godfather II\");\n",
    "INSERT VERTEX movie(name) VALUES \"The Godfather Coda: The Death of Michael Corleone\":(\"The Godfather Coda: The Death of Michael Corleone\");\n",
    "INSERT EDGE acted_in() VALUES \"Al Pacino\"->\"The Godfather II\":();\n",
    "INSERT EDGE acted_in() VALUES \"Al Pacino\"->\"The Godfather Coda: The Death of Michael Corleone\":();"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "62812aad",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.chat_models import ChatOpenAI\n",
    "from langchain.chains import NebulaGraphQAChain\n",
    "from langchain.graphs import NebulaGraph"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "0928915d",
   "metadata": {},
   "outputs": [],
   "source": [
    "graph = NebulaGraph(\n",
    "    space=\"langchain\",\n",
    "    username=\"root\",\n",
    "    password=\"nebula\",\n",
    "    address=\"127.0.0.1\",\n",
    "    port=9669,\n",
    "    session_pool_size=30,\n",
    ")"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "58c1a8ea",
   "metadata": {},
   "source": [
    "## Refresh graph schema information\n",
    "\n",
    "If the schema of database changes, you can refresh the schema information needed to generate nGQL statements."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "4e3de44f",
   "metadata": {},
   "outputs": [],
   "source": [
    "# graph.refresh_schema()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "1fe76ccd",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Node properties: [{'tag': 'movie', 'properties': [('name', 'string')]}, {'tag': 'person', 'properties': [('name', 'string'), ('birthdate', 'string')]}]\n",
      "Edge properties: [{'edge': 'acted_in', 'properties': []}]\n",
      "Relationships: ['(:person)-[:acted_in]->(:movie)']\n",
      "\n"
     ]
    }
   ],
   "source": [
    "print(graph.get_schema)"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "68a3c677",
   "metadata": {},
   "source": [
    "## Querying the graph\n",
    "\n",
    "We can now use the graph cypher QA chain to ask question of the graph"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "7476ce98",
   "metadata": {},
   "outputs": [],
   "source": [
    "chain = NebulaGraphQAChain.from_llm(\n",
    "    ChatOpenAI(temperature=0), graph=graph, verbose=True\n",
    ")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "ef8ee27b",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "\n",
      "\u001b[1m> Entering new NebulaGraphQAChain chain...\u001b[0m\n",
      "Generated nGQL:\n",
      "\u001b[32;1m\u001b[1;3mMATCH (p:`person`)-[:acted_in]->(m:`movie`) WHERE m.`movie`.`name` == 'The Godfather II'\n",
      "RETURN p.`person`.`name`\u001b[0m\n",
      "Full Context:\n",
      "\u001b[32;1m\u001b[1;3m{'p.person.name': ['Al Pacino']}\u001b[0m\n",
      "\n",
      "\u001b[1m> Finished chain.\u001b[0m\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "'Al Pacino played in The Godfather II.'"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "chain.run(\"Who played in The Godfather II?\")"
   ]
  }
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