Rename prompt_template => _DEFAULT_GRAPH_QA_TEMPLATE and PROMPT => GRAPH_QA_PROMPT to make consistent with the rest of the files (#7250)

Rename prompt_template => _DEFAULT_GRAPH_QA_TEMPLATE to make consistent
with the rest of the file.

langchain/chains/graph_qa/base.py

@@ -8,7 +8,7 @@ from pydantic import Field
 from langchain.base_language import BaseLanguageModel
 from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
-from langchain.chains.graph_qa.prompts import ENTITY_EXTRACTION_PROMPT, PROMPT
+from langchain.chains.graph_qa.prompts import ENTITY_EXTRACTION_PROMPT, GRAPH_QA_PROMPT
 from langchain.chains.llm import LLMChain
 from langchain.graphs.networkx_graph import NetworkxEntityGraph, get_entities
 from langchain.schema import BasePromptTemplate
@@ -44,7 +44,7 @@ class GraphQAChain(Chain):
     def from_llm(
         cls,
         llm: BaseLanguageModel,
-        qa_prompt: BasePromptTemplate = PROMPT,
+        qa_prompt: BasePromptTemplate = GRAPH_QA_PROMPT,
         entity_prompt: BasePromptTemplate = ENTITY_EXTRACTION_PROMPT,
         **kwargs: Any,
     ) -> GraphQAChain:

langchain/chains/graph_qa/prompts.py

@@ -23,14 +23,14 @@ ENTITY_EXTRACTION_PROMPT = PromptTemplate(
     input_variables=["input"], template=_DEFAULT_ENTITY_EXTRACTION_TEMPLATE
 )
 
-prompt_template = """Use the following knowledge triplets to answer the question at the end. If you don't know the answer, just say that you don't know, don't try to make up an answer.
+_DEFAULT_GRAPH_QA_TEMPLATE = """Use the following knowledge triplets to answer the question at the end. If you don't know the answer, just say that you don't know, don't try to make up an answer.
 
 {context}
 
 Question: {question}
 Helpful Answer:"""
-PROMPT = PromptTemplate(
-    template=prompt_template, input_variables=["context", "question"]
+GRAPH_QA_PROMPT = PromptTemplate(
+    template=_DEFAULT_GRAPH_QA_TEMPLATE, input_variables=["context", "question"]
 )
 
 CYPHER_GENERATION_TEMPLATE = """Task:Generate Cypher statement to query a graph database.