mirror of
https://github.com/hwchase17/langchain
synced 2024-11-08 07:10:35 +00:00
74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
from typing import Optional, Type
|
|
|
|
from langchain.callbacks.manager import (
|
|
AsyncCallbackManagerForToolRun,
|
|
CallbackManagerForToolRun,
|
|
)
|
|
|
|
# Import things that are needed generically
|
|
from langchain.pydantic_v1 import BaseModel, Field
|
|
from langchain.tools import BaseTool
|
|
|
|
from neo4j_semantic_ollama.utils import get_candidates, get_user_id, graph
|
|
|
|
store_rating_query = """
|
|
MERGE (u:User {userId:$user_id})
|
|
WITH u
|
|
UNWIND $candidates as row
|
|
MATCH (m:Movie {title: row.candidate})
|
|
MERGE (u)-[r:RATED]->(m)
|
|
SET r.rating = toFloat($rating)
|
|
RETURN distinct
|
|
'Create a final answer saying that preference has been stored' AS response
|
|
"""
|
|
|
|
|
|
def store_movie_rating(movie: str, rating: int):
|
|
user_id = get_user_id()
|
|
candidates = get_candidates(movie, "movie")
|
|
if not candidates:
|
|
return "This movie is not in our database"
|
|
response = graph.query(
|
|
store_rating_query,
|
|
params={"user_id": user_id, "candidates": candidates, "rating": rating},
|
|
)
|
|
try:
|
|
return response[0]["response"]
|
|
except Exception as e:
|
|
print(e)
|
|
return "Something went wrong"
|
|
|
|
|
|
class MemoryInput(BaseModel):
|
|
movie: str = Field(description="movie the user liked")
|
|
rating: int = Field(
|
|
description=(
|
|
"Rating from 1 to 5, where one represents heavy dislike "
|
|
"and 5 represent the user loved the movie"
|
|
)
|
|
)
|
|
|
|
|
|
class MemoryTool(BaseTool):
|
|
name = "Memory"
|
|
description = "useful for memorizing which movies the user liked"
|
|
args_schema: Type[BaseModel] = MemoryInput
|
|
|
|
def _run(
|
|
self,
|
|
movie: str,
|
|
rating: int,
|
|
run_manager: Optional[CallbackManagerForToolRun] = None,
|
|
) -> str:
|
|
"""Use the tool."""
|
|
return store_movie_rating(movie, rating)
|
|
|
|
async def _arun(
|
|
self,
|
|
movie: str,
|
|
rating: int,
|
|
run_manager: Optional[AsyncCallbackManagerForToolRun] = None,
|
|
) -> str:
|
|
"""Use the tool asynchronously."""
|
|
return store_movie_rating(movie, rating)
|