RafaelXokito
commented
3 months ago The case you're describing seems to be an edge case that occurs when your schema contains spaces in node labels or relationship types. This can be solved using the cypher_llm_kwargs argument in the from_llm class method.
The default prompt is a generic one that works in most scenarios. However, it should be concise while maintaining optimal results. Try the following prompt to handle this specific edge case:
cypher_prompt_template = """Task:Generate Cypher statement to query a graph database.
Instructions:
Use only the provided relationship types and properties in the schema.
Do not use any other relationship types or properties that are not provided.
Schema:
{schema}
Note: Do not include any explanations or apologies in your responses.
Do not respond to any questions that might ask anything else than for you to construct a Cypher statement.
Do not include any text except the generated Cypher statement.
Examples:
Example 1:
Schema: {Person: {name, age}, City: {name}, LIVES IN: {since}}
Question: Find all persons living in New York.
Output: MATCH (p:`Person`)-[:`LIVES IN`]->(c:`City` {name: 'New York'}) RETURN p
Example 2:
Schema: {Employee: {name, role}, Department: {name}, WORKS_IN: {since}}
Question: Retrieve the names of all employees working in the Sales department.
Output: MATCH (e:`Employee`)-[:`WORKS_IN`]->(d:`Department` {name: 'Sales'}) RETURN e.name
Example 3:
Schema: {Movie: {title, releaseYear}, Director: {name}, DIRECTED: {since}}
Question: List all movies directed by Christopher Nolan.
Output: MATCH (d:`Director` {name: 'Christopher Nolan'})-[:`DIRECTED`]->(m:`Movie`) RETURN m.title
The question is:
{question}"""
cypher_prompt = PromptTemplate(template=cypher_prompt_template, input_variables=[])
chain = GraphCypherQAChain.from_llm(graph=graph, llm=llm, verbose=True,
validate_cypher=True, cypher_llm_kwargs={"prompt": cypher_prompt})Try this approach and see if it resolves your issue.
Checked other resources
Example Code
Error Message and Stack Trace (if applicable)
Entering new GraphCypherQAChain chain... Generated Cypher: MATCH (t:Tools {name: "test.py"})-[:has MD5 hash]->(h:Hash) RETURN h.name Traceback (most recent call last): File "\lib\site-packages\langchain_community\graphs\neo4j_graph.py", line 391, in query data = session.run(Query(text=query, timeout=self.timeout), params) File "\lib\site-packages\neo4j_sync\work\session.py", line 313, in run self._auto_result._run( File "\lib\site-packages\neo4j_sync\work\result.py", line 181, in _run self._attach() File "\lib\site-packages\neo4j_sync\work\result.py", line 301, in _attach self._connection.fetch_message() File "\lib\site-packages\neo4j_sync\io_common.py", line 178, in inner func(args, kwargs) File "\lib\site-packages\neo4j_sync\io_bolt.py", line 850, in fetch_message res = self._process_message(tag, fields) File "\lib\site-packages\neo4j_sync\io_bolt5.py", line 369, in _process_message response.on_failure(summary_metadata or {}) File "\lib\site-packages\neo4j_sync\io_common.py", line 245, in on_failure raise Neo4jError.hydrate(metadata) neo4j.exceptions.CypherSyntaxError: {code: Neo.ClientError.Statement.SyntaxError} {message: Invalid input 'MD5': expected "" "WHERE" "]" "{" a parameter (line 1, column 50 (offset: 49)) "MATCH (t:Tools {name: "test.py"})-[:has MD5 hash]->(h:Hash) RETURN h.name" ^}
During handling of the above exception, another exception occurred:
Traceback (most recent call last): File "\graph_RAG.py", line 29, in
response = chain.invoke({"query": "What is the MD5 of test.py?"})
File "lib\site-packages\langchain\chains\base.py", line 166, in invoke
raise e
File "\lib\site-packages\langchain\chains\base.py", line 156, in invoke
self._call(inputs, run_manager=run_manager)
File "\lib\site-packages\langchain_community\chains\graph_qa\cypher.py", line 274, in _call
context = self.graph.query(generated_cypher)[: self.top_k]
File "\lib\site-packages\langchain_community\graphs\neo4j_graph.py", line 397, in query
raise ValueError(f"Generated Cypher Statement is not valid\n{e}")
ValueError: Generated Cypher Statement is not valid
{code: Neo.ClientError.Statement.SyntaxError} {message: Invalid input 'MD5': expected
"*"
"WHERE"
"]"
"{"
a parameter (line 1, column 50 (offset: 49))
"MATCH (t:Tools {name: "test.py"})-[:has MD5 hash]->(h:Hash) RETURN h.name"
^}
Description
Following the tutorial https://python.langchain.com/v0.2/docs/tutorials/graph/, the relationships between entities in my neo4j database contain spaces, and the agent cannot handle this situation correctly.
System Info
System Information
Package Information
Packages not installed (Not Necessarily a Problem)
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