Getting CypherSyntaxError and ValueError when running GraphCypherQAChain on Hugginface LLM

[KaifAhmad1]

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Example Code

from langchain.chains import GraphCypherQAChain
from langchain.graphs import Neo4jGraph
    
print(graph.schema)


chain = GraphCypherQAChain.from_llm(
    cypher_llm=llm,
    qa_llm=llm,
    graph=graph,
    verbose=True,
    return_intermediate_steps=True,
    validate_cypher=True
)
     
graph_result = chain.run("How can we enhance the specificity and efficiency of CRISPR/Cas9 gene-editing technology to minimize off-target effects and increase its potential for therapeutic applications?")

Description

> Entering new GraphCypherQAChain chain...
Generated Cypher:
 
---------------------------------------------------------------------------
CypherSyntaxError                         Traceback (most recent call last)
/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py in query(self, query, params)
    163             try:
--> 164                 data = session.run(Query(text=query, timeout=self.timeout), params)
    165                 json_data = [r.data() for r in data]

/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/session.py in run(self, query, parameters, **kwargs)
    312         parameters = dict(parameters or {}, **kwargs)
--> 313         self._auto_result._run(
    314             query, parameters, self._config.database,

/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/result.py in _run(self, query, parameters, db, imp_user, access_mode, bookmarks, notifications_min_severity, notifications_disabled_categories)
    180         self._connection.send_all()
--> 181         self._attach()
    182 

/usr/local/lib/python3.10/dist-packages/neo4j/_sync/work/result.py in _attach(self)
    300             while self._attached is False:
--> 301                 self._connection.fetch_message()
    302 

/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_common.py in inner(*args, **kwargs)
    177                 try:
--> 178                     func(*args, **kwargs)
    179                 except (Neo4jError, ServiceUnavailable, SessionExpired) as exc:

/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_bolt.py in fetch_message(self)
    848         )
--> 849         res = self._process_message(tag, fields)
    850         self.idle_since = monotonic()

/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_bolt5.py in _process_message(self, tag, fields)
    368             try:
--> 369                 response.on_failure(summary_metadata or {})
    370             except (ServiceUnavailable, DatabaseUnavailable):

/usr/local/lib/python3.10/dist-packages/neo4j/_sync/io/_common.py in on_failure(self, metadata)
    244         Util.callback(handler)
--> 245         raise Neo4jError.hydrate(**metadata)
    246 

CypherSyntaxError: {code: Neo.ClientError.Statement.SyntaxError} {message: Unexpected end of input: expected CYPHER, EXPLAIN, PROFILE or Query (line 0, column 1 (offset: 1))
""
  ^}

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
<ipython-input-36-4ff3ab735a16> in <cell line: 1>()
----> 1 graph_result = chain.run("How can we enhance the specificity and efficiency of CRISPR/Cas9 gene-editing technology to minimize off-target effects and increase its potential for therapeutic applications?")

/usr/local/lib/python3.10/dist-packages/langchain_core/_api/deprecation.py in warning_emitting_wrapper(*args, **kwargs)
    143                 warned = True
    144                 emit_warning()
--> 145             return wrapped(*args, **kwargs)
    146 
    147         async def awarning_emitting_wrapper(*args: Any, **kwargs: Any) -> Any:

/usr/local/lib/python3.10/dist-packages/langchain/chains/base.py in run(self, callbacks, tags, metadata, *args, **kwargs)
    536             if len(args) != 1:
    537                 raise ValueError("`run` supports only one positional argument.")
--> 538             return self(args[0], callbacks=callbacks, tags=tags, metadata=metadata)[
    539                 _output_key
    540             ]

/usr/local/lib/python3.10/dist-packages/langchain_core/_api/deprecation.py in warning_emitting_wrapper(*args, **kwargs)
    143                 warned = True
    144                 emit_warning()
--> 145             return wrapped(*args, **kwargs)
    146 
    147         async def awarning_emitting_wrapper(*args: Any, **kwargs: Any) -> Any:

/usr/local/lib/python3.10/dist-packages/langchain/chains/base.py in __call__(self, inputs, return_only_outputs, callbacks, tags, metadata, run_name, include_run_info)
    361         }
    362 
--> 363         return self.invoke(
    364             inputs,
    365             cast(RunnableConfig, {k: v for k, v in config.items() if v is not None}),

/usr/local/lib/python3.10/dist-packages/langchain/chains/base.py in invoke(self, input, config, **kwargs)
    160         except BaseException as e:
    161             run_manager.on_chain_error(e)
--> 162             raise e
    163         run_manager.on_chain_end(outputs)
    164         final_outputs: Dict[str, Any] = self.prep_outputs(

/usr/local/lib/python3.10/dist-packages/langchain/chains/base.py in invoke(self, input, config, **kwargs)
    154         try:
    155             outputs = (
--> 156                 self._call(inputs, run_manager=run_manager)
    157                 if new_arg_supported
    158                 else self._call(inputs)

/usr/local/lib/python3.10/dist-packages/langchain/chains/graph_qa/cypher.py in _call(self, inputs, run_manager)
    265         # Generated Cypher be null if query corrector identifies invalid schema
    266         if generated_cypher:
--> 267             context = self.graph.query(generated_cypher)[: self.top_k]
    268         else:
    269             context = []

/usr/local/lib/python3.10/dist-packages/langchain_community/graphs/neo4j_graph.py in query(self, query, params)
    168                 return json_data
    169             except CypherSyntaxError as e:
--> 170                 raise ValueError(f"Generated Cypher Statement is not valid\n{e}")
    171 
    172     def refresh_schema(self) -> None:

ValueError: Generated Cypher Statement is not valid
{code: Neo.ClientError.Statement.SyntaxError} {message: Unexpected end of input: expected CYPHER, EXPLAIN, PROFILE or Query (line 0, column 1 (offset: 1))
""
  ^}

System Info

pip = 24.0
Cuda = 12.1
OS = Windows 11 x64

[dosubot[bot]]

🤖

Hey there, @KaifAhmad1! Great to see you back with another intriguing puzzle for us to crack together. 🛠️

The CypherSyntaxError and ValueError you're encountering when running GraphCypherQAChain on Hugginface LLM in LangChain could be due to several reasons:

1. Incorrect Cypher Query: The Cypher query generated by the cypher_generation_chain might be incorrect. This could be due to the language model not generating a valid Cypher query. You can check the generated Cypher query by enabling verbose logging or by examining the intermediate steps if return_intermediate_steps is set to True.

2. Invalid Schema: The cypher_query_corrector might be identifying an invalid schema in the generated Cypher query. If the validate_cypher parameter is set to True during the initialization of GraphCypherQAChain, the cypher_query_corrector is used to validate the generated Cypher query. If the query does not match the schema, it is set to None, which could lead to a ValueError when trying to execute the query.

3. Incorrect Initialization: The ValueError could also be due to incorrect initialization of the GraphCypherQAChain. For instance, if both llm and cypher_llm or qa_llm are not provided, or if all three are provided simultaneously, a ValueError is raised. Similarly, if both exclude_types and include_types are provided, a ValueError is raised.

To debug this issue, you should first check the generated Cypher query and the schema used for validation. If the issue persists, you should check the initialization parameters of the GraphCypherQAChain.

Regarding your question about the role of cypher_llm and qa_llm in the GraphCypherQAChain.from_llm method, these parameters are not directly used. However, the method uses the BaseLanguageModel instance llm to create two LLMChain instances: qa_chain and ngql_generation_chain.

The qa_chain is used for question-answering. It is initialized with the llm and a qa_prompt which defaults to CYPHER_QA_PROMPT. This chain is later used in the _call method to answer the question based on the context obtained from the graph query.

The ngql_generation_chain is used for generating nGQL statements. It is also initialized with the llm and an ngql_prompt which defaults to NGQL_GENERATION_PROMPT. This chain is used in the _call method to generate an nGQL statement based on the question and the schema of the graph.

You can find more details in the source code of the GraphCypherQAChain class.

I hope this helps! If you have any more questions or need further clarification, feel free to ask.

Sources

• libs/langchain/langchain/chains/graph_qa/cypher.py
• libs/langchain/langchain/chains/graph_qa/nebulagraph.py

About Dosu

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[skfirebox]

hospital_cypher_chain = GraphCypherQAChain.from_llm(
cypher_llm=llm,
qa_llm=llm,
graph=graph,
verbose=True,
qa_prompt=qa_generation_prompt,
cypher_prompt=cypher_generation_prompt,
validate_cypher=True,
top_k=100,
)

model is ="mistralai/Mistral-7B-Instruct-v0.2"
question = """name of the patient which id is 56"""
response = hospital_cypher_chain.invoke(question)

Generate Query , why include "Cypher statment": how can i remove it ,please provie me correct answer

My OutPut and Error

Entering new GraphCypherQAChain chain...
Generated Cypher:

Cypher statement:
MATCH (p:Patient)
WHERE p.id = 56
RETURN p.name

---

CypherSyntaxError Traceback (most recent call last)
File ~/anaconda3/lib/python3.9/site-packages/langchain_community/graphs/neo4j_graph.py:246, in Neo4jGraph.query(self, query, params)
245 try:
--> 246 data = session.run(Query(text=query, timeout=self.timeout), params)
247 json_data = [r.data() for r in data]

File ~/anaconda3/lib/python3.9/site-packages/neo4j/_sync/work/session.py:313, in Session.run(self, query, parameters, **kwargs)
312 parameters = dict(parameters or {}, **kwargs)
--> 313 self._auto_result._run(
314 query, parameters, self._config.database,
315 self._config.impersonated_user, self._config.default_access_mode,
316 bookmarks, self._config.notifications_min_severity,
317 self._config.notifications_disabled_categories,
318 )
320 return self._auto_result

File ~/anaconda3/lib/python3.9/site-packages/neo4j/_sync/work/result.py:181, in Result._run(self, query, parameters, db, imp_user, access_mode, bookmarks, notifications_min_severity, notifications_disabled_categories)
180 self._connection.send_all()
--> 181 self._attach()

File ~/anaconda3/lib/python3.9/site-packages/neo4j/_sync/work/result.py:301, in Result._attach(self)
300 while self._attached is False:
--> 301 self._connection.fetch_message()

File ~/anaconda3/lib/python3.9/site-packages/neo4j/_sync/io/_common.py:178, in ConnectionErrorHandler.getattr..outer..inner(*args, **kwargs)
177 try:
--> 178 func(*args, **kwargs)
179 except (Neo4jError, ServiceUnavailable, SessionExpired) as exc:

File ~/anaconda3/lib/python3.9/site-packages/neo4j/_sync/io/_bolt.py:850, in Bolt.fetch_message(self)
847 tag, fields = self.inbox.pop(
848 hydration_hooks=self.responses[0].hydration_hooks
849 )
--> 850 res = self._process_message(tag, fields)
851 self.idle_since = monotonic()

File ~/anaconda3/lib/python3.9/site-packages/neo4j/_sync/io/_bolt5.py:369, in Bolt5x0._process_message(self, tag, fields)
368 try:
--> 369 response.on_failure(summary_metadata or {})
370 except (ServiceUnavailable, DatabaseUnavailable):

File ~/anaconda3/lib/python3.9/site-packages/neo4j/_sync/io/_common.py:245, in Response.on_failure(self, metadata)
244 Util.callback(handler)
--> 245 raise Neo4jError.hydrate(**metadata)

CypherSyntaxError: {code: Neo.ClientError.Statement.SyntaxError} {message: Invalid input 'statement': expected
"ALTER"
"CALL"
"CREATE"
"DEALLOCATE"
"DELETE"
"DENY"
"DETACH"
"DROP"
"DRYRUN"
"ENABLE"
"FINISH"
"FOREACH"
"GRANT"
"INSERT"
"LOAD"
"MATCH"
"MERGE"
"NODETACH"
"OPTIONAL"
"REALLOCATE"
"REMOVE"
"RENAME"
"RETURN"
"REVOKE"
"SET"
"SHOW"
"START"
"STOP"
"TERMINATE"
"UNWIND"
"USE"
"USING"
"WITH" (line 2, column 1 (offset: 8))
"Cypher statement:"
^}

During handling of the above exception, another exception occurred:

ValueError Traceback (most recent call last)
Cell In[145], line 13
1 hospital_cypher_chain = GraphCypherQAChain.from_llm(
2 cypher_llm=llm,
3 qa_llm=llm,
(...)
9 top_k=100,
10 )
12 question = """name of the patient which id is 56"""
---> 13 response = hospital_cypher_chain.invoke(question)

File ~/anaconda3/lib/python3.9/site-packages/langchain/chains/base.py:163, in Chain.invoke(self, input, config, **kwargs)
161 except BaseException as e:
162 run_manager.on_chain_error(e)
--> 163 raise e
164 run_manager.on_chain_end(outputs)
166 if include_run_info:

File ~/anaconda3/lib/python3.9/site-packages/langchain/chains/base.py:153, in Chain.invoke(self, input, config, **kwargs)
150 try:
151 self._validate_inputs(inputs)
152 outputs = (
--> 153 self._call(inputs, run_manager=run_manager)
154 if new_arg_supported
155 else self._call(inputs)
156 )
158 final_outputs: Dict[str, Any] = self.prep_outputs(
159 inputs, outputs, return_only_outputs
160 )
161 except BaseException as e:

File ~/anaconda3/lib/python3.9/site-packages/langchain/chains/graph_qa/cypher.py:268, in GraphCypherQAChain._call(self, inputs, run_manager)
265 # Retrieve and limit the number of results
266 # Generated Cypher be null if query corrector identifies invalid schema
267 if generated_cypher:
--> 268 context = self.graph.query(generated_cypher)[: self.top_k]
269 else:
270 context = []

File ~/anaconda3/lib/python3.9/site-packages/langchain_community/graphs/neo4j_graph.py:252, in Neo4jGraph.query(self, query, params)
250 return json_data
251 except CypherSyntaxError as e:
--> 252 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 'statement': expected
"ALTER"
"CALL"
"CREATE"
"DEALLOCATE"
"DELETE"
"DENY"
"DETACH"
"DROP"
"DRYRUN"
"ENABLE"
"FINISH"
"FOREACH"
"GRANT"
"INSERT"
"LOAD"
"MATCH"
"MERGE"
"NODETACH"
"OPTIONAL"
"REALLOCATE"
"REMOVE"
"RENAME"
"RETURN"
"REVOKE"
"SET"
"SHOW"
"START"
"STOP"
"TERMINATE"
"UNWIND"
"USE"
"USING"
"WITH" (line 2, column 1 (offset: 8))
"Cypher statement:"
^}

[rohan-patankar]

any solutions?

[li-hhhh]

请问你最后怎么解决的呀？我也遇到的这样的问题，谢谢

[tomasonjo]

Use the skip_prompt kwarg as shown here: https://python.langchain.com/v0.2/docs/integrations/llms/huggingface_pipelines/#create-chain V čet., 15. avg. 2024, 03:28 je oseba li-hhhh ***@***.***> napisala:

…

请问你最后怎么解决的呀？我也遇到的这样的问题，谢谢 — Reply to this email directly, view it on GitHub <#17643 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEYGGTMLDOVAU3N42T6J4J3ZRP74XAVCNFSM6AAAAABDMGUZJ2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTAMZUGI4DKMI> . You are receiving this because you were mentioned.Message ID: ***@***.*** com>