362 lines
14 KiB
Python
362 lines
14 KiB
Python
import logging
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from langchain_community.graphs import Neo4jGraph
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from rank_bm25 import BM25Okapi
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from mem0.graphs.tools import (
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ADD_MEMORY_STRUCT_TOOL_GRAPH,
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ADD_MEMORY_TOOL_GRAPH,
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ADD_MESSAGE_STRUCT_TOOL,
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ADD_MESSAGE_TOOL,
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NOOP_STRUCT_TOOL,
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NOOP_TOOL,
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SEARCH_STRUCT_TOOL,
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SEARCH_TOOL,
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UPDATE_MEMORY_STRUCT_TOOL_GRAPH,
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UPDATE_MEMORY_TOOL_GRAPH,
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)
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from mem0.graphs.utils import EXTRACT_ENTITIES_PROMPT, get_update_memory_messages
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from mem0.utils.factory import EmbedderFactory, LlmFactory
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logger = logging.getLogger(__name__)
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class MemoryGraph:
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def __init__(self, config):
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self.config = config
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self.graph = Neo4jGraph(
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self.config.graph_store.config.url,
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self.config.graph_store.config.username,
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self.config.graph_store.config.password,
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)
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self.embedding_model = EmbedderFactory.create(self.config.embedder.provider, self.config.embedder.config)
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self.llm_provider = "openai_structured"
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if self.config.llm.provider:
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self.llm_provider = self.config.llm.provider
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if self.config.graph_store.llm:
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self.llm_provider = self.config.graph_store.llm.provider
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self.llm = LlmFactory.create(self.llm_provider, self.config.llm.config)
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self.user_id = None
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self.threshold = 0.7
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def add(self, data, filters):
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"""
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Adds data to the graph.
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Args:
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data (str): The data to add to the graph.
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filters (dict): A dictionary containing filters to be applied during the addition.
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"""
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# retrieve the search results
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search_output = self._search(data, filters)
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if self.config.graph_store.custom_prompt:
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messages = [
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{
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"role": "system",
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"content": EXTRACT_ENTITIES_PROMPT.replace("USER_ID", self.user_id).replace(
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"CUSTOM_PROMPT", f"4. {self.config.graph_store.custom_prompt}"
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),
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},
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{"role": "user", "content": data},
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]
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else:
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messages = [
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{
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"role": "system",
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"content": EXTRACT_ENTITIES_PROMPT.replace("USER_ID", self.user_id),
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},
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{"role": "user", "content": data},
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]
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_tools = [ADD_MESSAGE_TOOL]
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if self.llm_provider in ["azure_openai_structured", "openai_structured"]:
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_tools = [ADD_MESSAGE_STRUCT_TOOL]
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extracted_entities = self.llm.generate_response(
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messages=messages,
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tools=_tools,
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)
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if extracted_entities["tool_calls"]:
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extracted_entities = extracted_entities["tool_calls"][0]["arguments"]["entities"]
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else:
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extracted_entities = []
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logger.debug(f"Extracted entities: {extracted_entities}")
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update_memory_prompt = get_update_memory_messages(search_output, extracted_entities)
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_tools = [UPDATE_MEMORY_TOOL_GRAPH, ADD_MEMORY_TOOL_GRAPH, NOOP_TOOL]
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if self.llm_provider in ["azure_openai_structured", "openai_structured"]:
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_tools = [
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UPDATE_MEMORY_STRUCT_TOOL_GRAPH,
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ADD_MEMORY_STRUCT_TOOL_GRAPH,
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NOOP_STRUCT_TOOL,
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]
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memory_updates = self.llm.generate_response(
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messages=update_memory_prompt,
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tools=_tools,
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)
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to_be_added = []
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for item in memory_updates["tool_calls"]:
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if item["name"] == "add_graph_memory":
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to_be_added.append(item["arguments"])
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elif item["name"] == "update_graph_memory":
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self._update_relationship(
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item["arguments"]["source"],
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item["arguments"]["destination"],
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item["arguments"]["relationship"],
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filters,
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)
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elif item["name"] == "noop":
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continue
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returned_entities = []
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for item in to_be_added:
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source = item["source"].lower().replace(" ", "_")
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source_type = item["source_type"].lower().replace(" ", "_")
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relation = item["relationship"].lower().replace(" ", "_")
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destination = item["destination"].lower().replace(" ", "_")
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destination_type = item["destination_type"].lower().replace(" ", "_")
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returned_entities.append({"source": source, "relationship": relation, "target": destination})
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# Create embeddings
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source_embedding = self.embedding_model.embed(source)
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dest_embedding = self.embedding_model.embed(destination)
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# Updated Cypher query to include node types and embeddings
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cypher = f"""
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MERGE (n:{source_type} {{name: $source_name, user_id: $user_id}})
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ON CREATE SET n.created = timestamp(), n.embedding = $source_embedding
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ON MATCH SET n.embedding = $source_embedding
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MERGE (m:{destination_type} {{name: $dest_name, user_id: $user_id}})
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ON CREATE SET m.created = timestamp(), m.embedding = $dest_embedding
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ON MATCH SET m.embedding = $dest_embedding
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MERGE (n)-[rel:{relation}]->(m)
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ON CREATE SET rel.created = timestamp()
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RETURN n, rel, m
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"""
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params = {
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"source_name": source,
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"dest_name": destination,
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"source_embedding": source_embedding,
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"dest_embedding": dest_embedding,
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"user_id": filters["user_id"],
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}
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_ = self.graph.query(cypher, params=params)
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logger.info(f"Added {len(to_be_added)} new memories to the graph")
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return returned_entities
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def _search(self, query, filters, limit=100):
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_tools = [SEARCH_TOOL]
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if self.llm_provider in ["azure_openai_structured", "openai_structured"]:
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_tools = [SEARCH_STRUCT_TOOL]
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search_results = self.llm.generate_response(
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messages=[
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{
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"role": "system",
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"content": f"You are a smart assistant who understands the entities, their types, and relations in a given text. If user message contains self reference such as 'I', 'me', 'my' etc. then use {filters['user_id']} as the source node. Extract the entities.",
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},
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{"role": "user", "content": query},
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],
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tools=_tools,
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)
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node_list = []
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relation_list = []
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for item in search_results["tool_calls"]:
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if item["name"] == "search":
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try:
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node_list.extend(item["arguments"]["nodes"])
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except Exception as e:
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logger.error(f"Error in search tool: {e}")
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node_list = list(set(node_list))
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relation_list = list(set(relation_list))
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node_list = [node.lower().replace(" ", "_") for node in node_list]
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relation_list = [relation.lower().replace(" ", "_") for relation in relation_list]
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logger.debug(f"Node list for search query : {node_list}")
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result_relations = []
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for node in node_list:
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n_embedding = self.embedding_model.embed(node)
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cypher_query = """
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MATCH (n)
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WHERE n.embedding IS NOT NULL AND n.user_id = $user_id
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WITH n,
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round(reduce(dot = 0.0, i IN range(0, size(n.embedding)-1) | dot + n.embedding[i] * $n_embedding[i]) /
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(sqrt(reduce(l2 = 0.0, i IN range(0, size(n.embedding)-1) | l2 + n.embedding[i] * n.embedding[i])) *
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sqrt(reduce(l2 = 0.0, i IN range(0, size($n_embedding)-1) | l2 + $n_embedding[i] * $n_embedding[i]))), 4) AS similarity
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WHERE similarity >= $threshold
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MATCH (n)-[r]->(m)
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RETURN n.name AS source, elementId(n) AS source_id, type(r) AS relation, elementId(r) AS relation_id, m.name AS destination, elementId(m) AS destination_id, similarity
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UNION
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MATCH (n)
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WHERE n.embedding IS NOT NULL AND n.user_id = $user_id
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WITH n,
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round(reduce(dot = 0.0, i IN range(0, size(n.embedding)-1) | dot + n.embedding[i] * $n_embedding[i]) /
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(sqrt(reduce(l2 = 0.0, i IN range(0, size(n.embedding)-1) | l2 + n.embedding[i] * n.embedding[i])) *
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sqrt(reduce(l2 = 0.0, i IN range(0, size($n_embedding)-1) | l2 + $n_embedding[i] * $n_embedding[i]))), 4) AS similarity
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WHERE similarity >= $threshold
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MATCH (m)-[r]->(n)
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RETURN m.name AS source, elementId(m) AS source_id, type(r) AS relation, elementId(r) AS relation_id, n.name AS destination, elementId(n) AS destination_id, similarity
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ORDER BY similarity DESC
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LIMIT $limit
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"""
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params = {
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"n_embedding": n_embedding,
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"threshold": self.threshold,
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"user_id": filters["user_id"],
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"limit": limit,
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}
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ans = self.graph.query(cypher_query, params=params)
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result_relations.extend(ans)
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return result_relations
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def search(self, query, filters, limit=100):
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"""
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Search for memories and related graph data.
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Args:
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query (str): Query to search for.
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filters (dict): A dictionary containing filters to be applied during the search.
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limit (int): The maximum number of nodes and relationships to retrieve. Defaults to 100.
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Returns:
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dict: A dictionary containing:
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- "contexts": List of search results from the base data store.
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- "entities": List of related graph data based on the query.
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"""
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search_output = self._search(query, filters, limit)
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if not search_output:
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return []
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search_outputs_sequence = [[item["source"], item["relation"], item["destination"]] for item in search_output]
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bm25 = BM25Okapi(search_outputs_sequence)
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tokenized_query = query.split(" ")
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reranked_results = bm25.get_top_n(tokenized_query, search_outputs_sequence, n=5)
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search_results = []
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for item in reranked_results:
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search_results.append({"source": item[0], "relationship": item[1], "target": item[2]})
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logger.info(f"Returned {len(search_results)} search results")
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return search_results
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def delete_all(self, filters):
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cypher = """
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MATCH (n {user_id: $user_id})
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DETACH DELETE n
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"""
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params = {"user_id": filters["user_id"]}
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self.graph.query(cypher, params=params)
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def get_all(self, filters, limit=100):
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"""
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Retrieves all nodes and relationships from the graph database based on optional filtering criteria.
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Args:
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filters (dict): A dictionary containing filters to be applied during the retrieval.
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limit (int): The maximum number of nodes and relationships to retrieve. Defaults to 100.
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Returns:
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list: A list of dictionaries, each containing:
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- 'contexts': The base data store response for each memory.
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- 'entities': A list of strings representing the nodes and relationships
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"""
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# return all nodes and relationships
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query = """
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MATCH (n {user_id: $user_id})-[r]->(m {user_id: $user_id})
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RETURN n.name AS source, type(r) AS relationship, m.name AS target
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LIMIT $limit
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"""
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results = self.graph.query(query, params={"user_id": filters["user_id"], "limit": limit})
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final_results = []
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for result in results:
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final_results.append(
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{
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"source": result["source"],
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"relationship": result["relationship"],
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"target": result["target"],
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}
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)
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logger.info(f"Retrieved {len(final_results)} relationships")
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return final_results
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def _update_relationship(self, source, target, relationship, filters):
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"""
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Update or create a relationship between two nodes in the graph.
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Args:
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source (str): The name of the source node.
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target (str): The name of the target node.
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relationship (str): The type of the relationship.
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filters (dict): A dictionary containing filters to be applied during the update.
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Raises:
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Exception: If the operation fails.
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"""
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logger.info(f"Updating relationship: {source} -{relationship}-> {target}")
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relationship = relationship.lower().replace(" ", "_")
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# Check if nodes exist and create them if they don't
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check_and_create_query = """
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MERGE (n1 {name: $source, user_id: $user_id})
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MERGE (n2 {name: $target, user_id: $user_id})
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"""
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self.graph.query(
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check_and_create_query,
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params={"source": source, "target": target, "user_id": filters["user_id"]},
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)
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# Delete any existing relationship between the nodes
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delete_query = """
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MATCH (n1 {name: $source, user_id: $user_id})-[r]->(n2 {name: $target, user_id: $user_id})
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DELETE r
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"""
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self.graph.query(
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delete_query,
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params={"source": source, "target": target, "user_id": filters["user_id"]},
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)
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# Create the new relationship
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create_query = f"""
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MATCH (n1 {{name: $source, user_id: $user_id}}), (n2 {{name: $target, user_id: $user_id}})
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CREATE (n1)-[r:{relationship}]->(n2)
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RETURN n1, r, n2
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"""
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result = self.graph.query(
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create_query,
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params={"source": source, "target": target, "user_id": filters["user_id"]},
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)
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if not result:
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raise Exception(f"Failed to update or create relationship between {source} and {target}")
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