Facing Issue with the GraphCypherQAChain with FewshotPromptTemplate

[Nimmalapudi-Pratyusha]

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Example Code

const chain = GraphCypherQAChain.fromLLM({
      graph,
      cypherLLM,
      qaLLM,
      cypherPrompt: cypherPromptTemplate,
      cypher_qa_prompt,
      returnDirect: true,
      validateCypher: true,
      verbose:true,
      returnIntermediateSteps:true
    });

    const cypher = await chain.invoke({question:prompt });

Description

Passing some Examples for the Cypher Queries and using the FewshotPromptTemplate with the examples and the prompt to it and finally invoking with the GraphCypherQAChain

System Info

Node version = v16.15.1

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To resolve the Neo4j error indicating an invalid input 'I' when using the GraphCypherQAChain with the FewshotPromptTemplate, ensure that the generated Cypher statement is correctly formatted and does not include any extraneous text. Here is a corrected example:

import { Neo4jGraph } from "@langchain/community/graphs/neo4j_graph";
import { OpenAI } from "@langchain/openai";
import { GraphCypherQAChain } from "langchain/chains/graph_qa/cypher";
import { CYPHER_GENERATION_PROMPT } from "langchain/src/chains/graph_qa/prompts";

const url = "bolt://localhost:7687";
const username = "neo4j";
const password = "pleaseletmein";

const graph = await Neo4jGraph.initialize({ url, username, password });
const model = new OpenAI({ temperature: 0 });

// Populate the database with two nodes and a relationship
await graph.query(
  "CREATE (a:Actor {name:'Bruce Willis'})" +
    "-[:ACTED_IN]->(:Movie {title: 'Pulp Fiction'})"
);

// Refresh schema
await graph.refreshSchema();

const chain = GraphCypherQAChain.fromLLM({
  llm: model,
  graph,
  cypherPrompt: CYPHER_GENERATION_PROMPT,
});

const res = await chain.run("Who played in Pulp Fiction?");
console.log(res);
// Bruce Willis played in Pulp Fiction.

Ensure that the CYPHER_GENERATION_PROMPT is used to generate a valid Cypher query enclosed in triple backticks. This should help resolve the Neo4j error indicating an invalid input 'I' ^[1][2][3][4].

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