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[community][graph]: Update KuzuQAChain and docs (#21218)

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This PR makes some small updates for `KuzuQAChain` for graph QA.

- Updated Cypher generation prompt (we now support `WHERE EXISTS`) and
generalize it more
- Support different LLMs for Cypher generation and QA
- Update docs and examples
This commit is contained in:
Prashanth Rao
2024-05-13 20:17:14 -04:00
committed by GitHub
parent 752b1e85f8
commit 63c3a0e56c
3 changed files with 246 additions and 117 deletions
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10
libs/community/langchain_community/chains/graph_qa/prompts.py
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@@ -75,13 +75,11 @@ NGQL_GENERATION_PROMPT = PromptTemplate(
KUZU_EXTRA_INSTRUCTIONS = """
Instructions:
Generate the Kùzu dialect of Cypher with the following rules in mind:
1. Do not use a `WHERE EXISTS` clause to check the existence of a property.
2. Do not omit the relationship pattern. Always use `()-[]->()` instead of `()->()`.
3. Do not include any notes or comments even if the statement does not produce the expected result.
```\n"""
1. Do not omit the relationship pattern. Always use `()-[]->()` instead of `()->()`.
2. Do not include triple backticks ``` in your response. Return only Cypher.
3. Do not return any notes or comments in your response.
\n"""
KUZU_GENERATION_TEMPLATE = CYPHER_GENERATION_TEMPLATE.replace(
"Generate Cypher", "Generate Kùzu Cypher"