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https://github.com/getzep/graphiti.git
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807 lines
27 KiB
Python
807 lines
27 KiB
Python
"""
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Copyright 2024, Zep Software, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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import json
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import logging
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from abc import ABC, abstractmethod
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from datetime import datetime
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from enum import Enum
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from time import time
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from typing import Any
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from uuid import uuid4
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from pydantic import BaseModel, Field
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from typing_extensions import LiteralString
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from graphiti_core.driver.driver import (
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GraphDriver,
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GraphProvider,
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)
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from graphiti_core.embedder import EmbedderClient
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from graphiti_core.errors import NodeNotFoundError
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from graphiti_core.helpers import parse_db_date
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from graphiti_core.models.nodes.node_db_queries import (
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COMMUNITY_NODE_RETURN,
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COMMUNITY_NODE_RETURN_NEPTUNE,
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EPISODIC_NODE_RETURN,
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EPISODIC_NODE_RETURN_NEPTUNE,
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get_community_node_save_query,
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get_entity_node_return_query,
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get_entity_node_save_query,
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get_episode_node_save_query,
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)
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from graphiti_core.utils.datetime_utils import utc_now
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logger = logging.getLogger(__name__)
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class EpisodeType(Enum):
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"""
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Enumeration of different types of episodes that can be processed.
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This enum defines the various sources or formats of episodes that the system
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can handle. It's used to categorize and potentially handle different types
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of input data differently.
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Attributes:
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-----------
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message : str
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Represents a standard message-type episode. The content for this type
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should be formatted as "actor: content". For example, "user: Hello, how are you?"
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or "assistant: I'm doing well, thank you for asking."
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json : str
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Represents an episode containing a JSON string object with structured data.
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text : str
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Represents a plain text episode.
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"""
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message = 'message'
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json = 'json'
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text = 'text'
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@staticmethod
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def from_str(episode_type: str):
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if episode_type == 'message':
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return EpisodeType.message
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if episode_type == 'json':
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return EpisodeType.json
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if episode_type == 'text':
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return EpisodeType.text
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logger.error(f'Episode type: {episode_type} not implemented')
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raise NotImplementedError
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class Node(BaseModel, ABC):
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uuid: str = Field(default_factory=lambda: str(uuid4()))
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name: str = Field(description='name of the node')
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group_id: str = Field(description='partition of the graph')
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labels: list[str] = Field(default_factory=list)
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created_at: datetime = Field(default_factory=lambda: utc_now())
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@abstractmethod
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async def save(self, driver: GraphDriver): ...
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async def delete(self, driver: GraphDriver):
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if driver.graph_operations_interface:
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return await driver.graph_operations_interface.node_delete(self, driver)
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match driver.provider:
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case GraphProvider.NEO4J:
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records, _, _ = await driver.execute_query(
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"""
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MATCH (n {uuid: $uuid})
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WHERE n:Entity OR n:Episodic OR n:Community
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OPTIONAL MATCH (n)-[r]-()
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WITH collect(r.uuid) AS edge_uuids, n
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DETACH DELETE n
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RETURN edge_uuids
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""",
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uuid=self.uuid,
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)
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case GraphProvider.KUZU:
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for label in ['Episodic', 'Community']:
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await driver.execute_query(
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f"""
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MATCH (n:{label} {{uuid: $uuid}})
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DETACH DELETE n
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""",
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uuid=self.uuid,
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)
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# Entity edges are actually nodes in Kuzu, so simple `DETACH DELETE` will not work.
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# Explicitly delete the "edge" nodes first, then the entity node.
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await driver.execute_query(
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"""
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MATCH (n:Entity {uuid: $uuid})-[:RELATES_TO]->(e:RelatesToNode_)
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DETACH DELETE e
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""",
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uuid=self.uuid,
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)
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await driver.execute_query(
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"""
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MATCH (n:Entity {uuid: $uuid})
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DETACH DELETE n
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""",
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uuid=self.uuid,
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)
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case _: # FalkorDB, Neptune
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for label in ['Entity', 'Episodic', 'Community']:
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await driver.execute_query(
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f"""
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MATCH (n:{label} {{uuid: $uuid}})
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DETACH DELETE n
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""",
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uuid=self.uuid,
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)
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logger.debug(f'Deleted Node: {self.uuid}')
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def __hash__(self):
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return hash(self.uuid)
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def __eq__(self, other):
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if isinstance(other, Node):
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return self.uuid == other.uuid
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return False
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@classmethod
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async def delete_by_group_id(cls, driver: GraphDriver, group_id: str, batch_size: int = 100):
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if driver.graph_operations_interface:
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return await driver.graph_operations_interface.node_delete_by_group_id(
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cls, driver, group_id, batch_size
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)
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match driver.provider:
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case GraphProvider.NEO4J:
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async with driver.session() as session:
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await session.run(
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"""
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MATCH (n:Entity|Episodic|Community {group_id: $group_id})
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CALL (n) {
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DETACH DELETE n
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} IN TRANSACTIONS OF $batch_size ROWS
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""",
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group_id=group_id,
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batch_size=batch_size,
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)
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case GraphProvider.KUZU:
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for label in ['Episodic', 'Community']:
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await driver.execute_query(
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f"""
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MATCH (n:{label} {{group_id: $group_id}})
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DETACH DELETE n
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""",
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group_id=group_id,
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)
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# Entity edges are actually nodes in Kuzu, so simple `DETACH DELETE` will not work.
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# Explicitly delete the "edge" nodes first, then the entity node.
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await driver.execute_query(
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"""
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MATCH (n:Entity {group_id: $group_id})-[:RELATES_TO]->(e:RelatesToNode_)
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DETACH DELETE e
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""",
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group_id=group_id,
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)
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await driver.execute_query(
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"""
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MATCH (n:Entity {group_id: $group_id})
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DETACH DELETE n
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""",
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group_id=group_id,
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)
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case _: # FalkorDB, Neptune
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for label in ['Entity', 'Episodic', 'Community']:
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await driver.execute_query(
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f"""
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MATCH (n:{label} {{group_id: $group_id}})
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DETACH DELETE n
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""",
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group_id=group_id,
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)
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@classmethod
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async def delete_by_uuids(cls, driver: GraphDriver, uuids: list[str], batch_size: int = 100):
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if driver.graph_operations_interface:
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return await driver.graph_operations_interface.node_delete_by_uuids(
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cls, driver, uuids, group_id=None, batch_size=batch_size
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)
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match driver.provider:
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case GraphProvider.FALKORDB:
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for label in ['Entity', 'Episodic', 'Community']:
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await driver.execute_query(
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f"""
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MATCH (n:{label})
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WHERE n.uuid IN $uuids
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DETACH DELETE n
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""",
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uuids=uuids,
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)
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case GraphProvider.KUZU:
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for label in ['Episodic', 'Community']:
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await driver.execute_query(
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f"""
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MATCH (n:{label})
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WHERE n.uuid IN $uuids
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DETACH DELETE n
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""",
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uuids=uuids,
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)
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# Entity edges are actually nodes in Kuzu, so simple `DETACH DELETE` will not work.
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# Explicitly delete the "edge" nodes first, then the entity node.
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await driver.execute_query(
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"""
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MATCH (n:Entity)-[:RELATES_TO]->(e:RelatesToNode_)
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WHERE n.uuid IN $uuids
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DETACH DELETE e
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""",
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uuids=uuids,
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)
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await driver.execute_query(
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"""
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MATCH (n:Entity)
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WHERE n.uuid IN $uuids
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DETACH DELETE n
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""",
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uuids=uuids,
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)
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case _: # Neo4J, Neptune
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async with driver.session() as session:
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# Collect all edge UUIDs before deleting nodes
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await session.run(
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"""
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MATCH (n:Entity|Episodic|Community)
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WHERE n.uuid IN $uuids
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MATCH (n)-[r]-()
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RETURN collect(r.uuid) AS edge_uuids
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""",
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uuids=uuids,
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)
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# Now delete the nodes in batches
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await session.run(
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"""
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MATCH (n:Entity|Episodic|Community)
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WHERE n.uuid IN $uuids
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CALL (n) {
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DETACH DELETE n
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} IN TRANSACTIONS OF $batch_size ROWS
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""",
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uuids=uuids,
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batch_size=batch_size,
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)
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@classmethod
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async def get_by_uuid(cls, driver: GraphDriver, uuid: str): ...
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@classmethod
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async def get_by_uuids(cls, driver: GraphDriver, uuids: list[str]): ...
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class EpisodicNode(Node):
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source: EpisodeType = Field(description='source type')
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source_description: str = Field(description='description of the data source')
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content: str = Field(description='raw episode data')
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valid_at: datetime = Field(
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description='datetime of when the original document was created',
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)
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entity_edges: list[str] = Field(
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description='list of entity edges referenced in this episode',
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default_factory=list,
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)
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async def save(self, driver: GraphDriver):
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if driver.graph_operations_interface:
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return await driver.graph_operations_interface.episodic_node_save(self, driver)
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episode_args = {
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'uuid': self.uuid,
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'name': self.name,
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'group_id': self.group_id,
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'source_description': self.source_description,
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'content': self.content,
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'entity_edges': self.entity_edges,
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'created_at': self.created_at,
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'valid_at': self.valid_at,
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'source': self.source.value,
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}
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result = await driver.execute_query(
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get_episode_node_save_query(driver.provider), **episode_args
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)
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logger.debug(f'Saved Node to Graph: {self.uuid}')
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return result
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@classmethod
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async def get_by_uuid(cls, driver: GraphDriver, uuid: str):
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records, _, _ = await driver.execute_query(
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"""
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MATCH (e:Episodic {uuid: $uuid})
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RETURN
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"""
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+ (
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EPISODIC_NODE_RETURN_NEPTUNE
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if driver.provider == GraphProvider.NEPTUNE
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else EPISODIC_NODE_RETURN
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),
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uuid=uuid,
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routing_='r',
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)
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episodes = [get_episodic_node_from_record(record) for record in records]
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if len(episodes) == 0:
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raise NodeNotFoundError(uuid)
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return episodes[0]
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@classmethod
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async def get_by_uuids(cls, driver: GraphDriver, uuids: list[str]):
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records, _, _ = await driver.execute_query(
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"""
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MATCH (e:Episodic)
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WHERE e.uuid IN $uuids
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RETURN DISTINCT
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"""
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+ (
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EPISODIC_NODE_RETURN_NEPTUNE
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if driver.provider == GraphProvider.NEPTUNE
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else EPISODIC_NODE_RETURN
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),
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uuids=uuids,
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routing_='r',
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)
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episodes = [get_episodic_node_from_record(record) for record in records]
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return episodes
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@classmethod
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async def get_by_group_ids(
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cls,
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driver: GraphDriver,
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group_ids: list[str],
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limit: int | None = None,
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uuid_cursor: str | None = None,
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):
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cursor_query: LiteralString = 'AND e.uuid < $uuid' if uuid_cursor else ''
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limit_query: LiteralString = 'LIMIT $limit' if limit is not None else ''
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records, _, _ = await driver.execute_query(
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"""
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MATCH (e:Episodic)
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WHERE e.group_id IN $group_ids
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"""
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+ cursor_query
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+ """
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RETURN DISTINCT
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"""
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+ (
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EPISODIC_NODE_RETURN_NEPTUNE
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if driver.provider == GraphProvider.NEPTUNE
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else EPISODIC_NODE_RETURN
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)
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+ """
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ORDER BY uuid DESC
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"""
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+ limit_query,
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group_ids=group_ids,
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uuid=uuid_cursor,
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limit=limit,
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routing_='r',
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)
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episodes = [get_episodic_node_from_record(record) for record in records]
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return episodes
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@classmethod
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async def get_by_entity_node_uuid(cls, driver: GraphDriver, entity_node_uuid: str):
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records, _, _ = await driver.execute_query(
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"""
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MATCH (e:Episodic)-[r:MENTIONS]->(n:Entity {uuid: $entity_node_uuid})
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RETURN DISTINCT
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"""
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+ (
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EPISODIC_NODE_RETURN_NEPTUNE
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if driver.provider == GraphProvider.NEPTUNE
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else EPISODIC_NODE_RETURN
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),
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entity_node_uuid=entity_node_uuid,
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routing_='r',
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)
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episodes = [get_episodic_node_from_record(record) for record in records]
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return episodes
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class EntityNode(Node):
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name_embedding: list[float] | None = Field(default=None, description='embedding of the name')
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summary: str = Field(description='regional summary of surrounding edges', default_factory=str)
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attributes: dict[str, Any] = Field(
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default={}, description='Additional attributes of the node. Dependent on node labels'
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)
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async def generate_name_embedding(self, embedder: EmbedderClient):
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start = time()
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text = self.name.replace('\n', ' ')
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self.name_embedding = await embedder.create(input_data=[text])
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end = time()
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logger.debug(f'embedded {text} in {end - start} ms')
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return self.name_embedding
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async def load_name_embedding(self, driver: GraphDriver):
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if driver.graph_operations_interface:
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return await driver.graph_operations_interface.node_load_embeddings(self, driver)
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if driver.provider == GraphProvider.NEPTUNE:
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query: LiteralString = """
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MATCH (n:Entity {uuid: $uuid})
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RETURN [x IN split(n.name_embedding, ",") | toFloat(x)] as name_embedding
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"""
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else:
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query: LiteralString = """
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MATCH (n:Entity {uuid: $uuid})
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RETURN n.name_embedding AS name_embedding
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"""
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records, _, _ = await driver.execute_query(
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query,
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uuid=self.uuid,
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routing_='r',
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)
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if len(records) == 0:
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raise NodeNotFoundError(self.uuid)
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self.name_embedding = records[0]['name_embedding']
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async def save(self, driver: GraphDriver):
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if driver.graph_operations_interface:
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return await driver.graph_operations_interface.node_save(self, driver)
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entity_data: dict[str, Any] = {
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'uuid': self.uuid,
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'name': self.name,
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'name_embedding': self.name_embedding,
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'group_id': self.group_id,
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'summary': self.summary,
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'created_at': self.created_at,
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}
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if driver.provider == GraphProvider.KUZU:
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entity_data['attributes'] = json.dumps(self.attributes)
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entity_data['labels'] = list(set(self.labels + ['Entity']))
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result = await driver.execute_query(
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get_entity_node_save_query(driver.provider, labels=''),
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**entity_data,
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)
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else:
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entity_data.update(self.attributes or {})
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labels = ':'.join(self.labels + ['Entity'])
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result = await driver.execute_query(
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get_entity_node_save_query(driver.provider, labels),
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entity_data=entity_data,
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)
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logger.debug(f'Saved Node to Graph: {self.uuid}')
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return result
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@classmethod
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async def get_by_uuid(cls, driver: GraphDriver, uuid: str):
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records, _, _ = await driver.execute_query(
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"""
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MATCH (n:Entity {uuid: $uuid})
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RETURN
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"""
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+ get_entity_node_return_query(driver.provider),
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uuid=uuid,
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routing_='r',
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)
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nodes = [get_entity_node_from_record(record, driver.provider) for record in records]
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if len(nodes) == 0:
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raise NodeNotFoundError(uuid)
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return nodes[0]
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@classmethod
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async def get_by_uuids(cls, driver: GraphDriver, uuids: list[str]):
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records, _, _ = await driver.execute_query(
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"""
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MATCH (n:Entity)
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WHERE n.uuid IN $uuids
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RETURN
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"""
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+ get_entity_node_return_query(driver.provider),
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uuids=uuids,
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routing_='r',
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)
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nodes = [get_entity_node_from_record(record, driver.provider) for record in records]
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return nodes
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|
|
@classmethod
|
|
async def get_by_group_ids(
|
|
cls,
|
|
driver: GraphDriver,
|
|
group_ids: list[str],
|
|
limit: int | None = None,
|
|
uuid_cursor: str | None = None,
|
|
with_embeddings: bool = False,
|
|
):
|
|
cursor_query: LiteralString = 'AND n.uuid < $uuid' if uuid_cursor else ''
|
|
limit_query: LiteralString = 'LIMIT $limit' if limit is not None else ''
|
|
with_embeddings_query: LiteralString = (
|
|
""",
|
|
n.name_embedding AS name_embedding
|
|
"""
|
|
if with_embeddings
|
|
else ''
|
|
)
|
|
|
|
records, _, _ = await driver.execute_query(
|
|
"""
|
|
MATCH (n:Entity)
|
|
WHERE n.group_id IN $group_ids
|
|
"""
|
|
+ cursor_query
|
|
+ """
|
|
RETURN
|
|
"""
|
|
+ get_entity_node_return_query(driver.provider)
|
|
+ with_embeddings_query
|
|
+ """
|
|
ORDER BY n.uuid DESC
|
|
"""
|
|
+ limit_query,
|
|
group_ids=group_ids,
|
|
uuid=uuid_cursor,
|
|
limit=limit,
|
|
routing_='r',
|
|
)
|
|
|
|
nodes = [get_entity_node_from_record(record, driver.provider) for record in records]
|
|
|
|
return nodes
|
|
|
|
|
|
class CommunityNode(Node):
|
|
name_embedding: list[float] | None = Field(default=None, description='embedding of the name')
|
|
summary: str = Field(description='region summary of member nodes', default_factory=str)
|
|
|
|
async def save(self, driver: GraphDriver):
|
|
if driver.provider == GraphProvider.NEPTUNE:
|
|
await driver.save_to_aoss( # pyright: ignore reportAttributeAccessIssue
|
|
'communities',
|
|
[{'name': self.name, 'uuid': self.uuid, 'group_id': self.group_id}],
|
|
)
|
|
result = await driver.execute_query(
|
|
get_community_node_save_query(driver.provider), # type: ignore
|
|
uuid=self.uuid,
|
|
name=self.name,
|
|
group_id=self.group_id,
|
|
summary=self.summary,
|
|
name_embedding=self.name_embedding,
|
|
created_at=self.created_at,
|
|
)
|
|
|
|
logger.debug(f'Saved Node to Graph: {self.uuid}')
|
|
|
|
return result
|
|
|
|
async def generate_name_embedding(self, embedder: EmbedderClient):
|
|
start = time()
|
|
text = self.name.replace('\n', ' ')
|
|
self.name_embedding = await embedder.create(input_data=[text])
|
|
end = time()
|
|
logger.debug(f'embedded {text} in {end - start} ms')
|
|
|
|
return self.name_embedding
|
|
|
|
async def load_name_embedding(self, driver: GraphDriver):
|
|
if driver.provider == GraphProvider.NEPTUNE:
|
|
query: LiteralString = """
|
|
MATCH (c:Community {uuid: $uuid})
|
|
RETURN [x IN split(c.name_embedding, ",") | toFloat(x)] as name_embedding
|
|
"""
|
|
else:
|
|
query: LiteralString = """
|
|
MATCH (c:Community {uuid: $uuid})
|
|
RETURN c.name_embedding AS name_embedding
|
|
"""
|
|
|
|
records, _, _ = await driver.execute_query(
|
|
query,
|
|
uuid=self.uuid,
|
|
routing_='r',
|
|
)
|
|
|
|
if len(records) == 0:
|
|
raise NodeNotFoundError(self.uuid)
|
|
|
|
self.name_embedding = records[0]['name_embedding']
|
|
|
|
@classmethod
|
|
async def get_by_uuid(cls, driver: GraphDriver, uuid: str):
|
|
records, _, _ = await driver.execute_query(
|
|
"""
|
|
MATCH (c:Community {uuid: $uuid})
|
|
RETURN
|
|
"""
|
|
+ (
|
|
COMMUNITY_NODE_RETURN_NEPTUNE
|
|
if driver.provider == GraphProvider.NEPTUNE
|
|
else COMMUNITY_NODE_RETURN
|
|
),
|
|
uuid=uuid,
|
|
routing_='r',
|
|
)
|
|
|
|
nodes = [get_community_node_from_record(record) for record in records]
|
|
|
|
if len(nodes) == 0:
|
|
raise NodeNotFoundError(uuid)
|
|
|
|
return nodes[0]
|
|
|
|
@classmethod
|
|
async def get_by_uuids(cls, driver: GraphDriver, uuids: list[str]):
|
|
records, _, _ = await driver.execute_query(
|
|
"""
|
|
MATCH (c:Community)
|
|
WHERE c.uuid IN $uuids
|
|
RETURN
|
|
"""
|
|
+ (
|
|
COMMUNITY_NODE_RETURN_NEPTUNE
|
|
if driver.provider == GraphProvider.NEPTUNE
|
|
else COMMUNITY_NODE_RETURN
|
|
),
|
|
uuids=uuids,
|
|
routing_='r',
|
|
)
|
|
|
|
communities = [get_community_node_from_record(record) for record in records]
|
|
|
|
return communities
|
|
|
|
@classmethod
|
|
async def get_by_group_ids(
|
|
cls,
|
|
driver: GraphDriver,
|
|
group_ids: list[str],
|
|
limit: int | None = None,
|
|
uuid_cursor: str | None = None,
|
|
):
|
|
cursor_query: LiteralString = 'AND c.uuid < $uuid' if uuid_cursor else ''
|
|
limit_query: LiteralString = 'LIMIT $limit' if limit is not None else ''
|
|
|
|
records, _, _ = await driver.execute_query(
|
|
"""
|
|
MATCH (c:Community)
|
|
WHERE c.group_id IN $group_ids
|
|
"""
|
|
+ cursor_query
|
|
+ """
|
|
RETURN
|
|
"""
|
|
+ (
|
|
COMMUNITY_NODE_RETURN_NEPTUNE
|
|
if driver.provider == GraphProvider.NEPTUNE
|
|
else COMMUNITY_NODE_RETURN
|
|
)
|
|
+ """
|
|
ORDER BY c.uuid DESC
|
|
"""
|
|
+ limit_query,
|
|
group_ids=group_ids,
|
|
uuid=uuid_cursor,
|
|
limit=limit,
|
|
routing_='r',
|
|
)
|
|
|
|
communities = [get_community_node_from_record(record) for record in records]
|
|
|
|
return communities
|
|
|
|
|
|
# Node helpers
|
|
def get_episodic_node_from_record(record: Any) -> EpisodicNode:
|
|
created_at = parse_db_date(record['created_at'])
|
|
valid_at = parse_db_date(record['valid_at'])
|
|
|
|
if created_at is None:
|
|
raise ValueError(f'created_at cannot be None for episode {record.get("uuid", "unknown")}')
|
|
if valid_at is None:
|
|
raise ValueError(f'valid_at cannot be None for episode {record.get("uuid", "unknown")}')
|
|
|
|
return EpisodicNode(
|
|
content=record['content'],
|
|
created_at=created_at,
|
|
valid_at=valid_at,
|
|
uuid=record['uuid'],
|
|
group_id=record['group_id'],
|
|
source=EpisodeType.from_str(record['source']),
|
|
name=record['name'],
|
|
source_description=record['source_description'],
|
|
entity_edges=record['entity_edges'],
|
|
)
|
|
|
|
|
|
def get_entity_node_from_record(record: Any, provider: GraphProvider) -> EntityNode:
|
|
if provider == GraphProvider.KUZU:
|
|
attributes = json.loads(record['attributes']) if record['attributes'] else {}
|
|
else:
|
|
attributes = record['attributes']
|
|
attributes.pop('uuid', None)
|
|
attributes.pop('name', None)
|
|
attributes.pop('group_id', None)
|
|
attributes.pop('name_embedding', None)
|
|
attributes.pop('summary', None)
|
|
attributes.pop('created_at', None)
|
|
attributes.pop('labels', None)
|
|
|
|
labels = record.get('labels', [])
|
|
group_id = record.get('group_id')
|
|
if 'Entity_' + group_id.replace('-', '') in labels:
|
|
labels.remove('Entity_' + group_id.replace('-', ''))
|
|
|
|
entity_node = EntityNode(
|
|
uuid=record['uuid'],
|
|
name=record['name'],
|
|
name_embedding=record.get('name_embedding'),
|
|
group_id=group_id,
|
|
labels=labels,
|
|
created_at=parse_db_date(record['created_at']), # type: ignore
|
|
summary=record['summary'],
|
|
attributes=attributes,
|
|
)
|
|
|
|
return entity_node
|
|
|
|
|
|
def get_community_node_from_record(record: Any) -> CommunityNode:
|
|
return CommunityNode(
|
|
uuid=record['uuid'],
|
|
name=record['name'],
|
|
group_id=record['group_id'],
|
|
name_embedding=record['name_embedding'],
|
|
created_at=parse_db_date(record['created_at']), # type: ignore
|
|
summary=record['summary'],
|
|
)
|
|
|
|
|
|
async def create_entity_node_embeddings(embedder: EmbedderClient, nodes: list[EntityNode]):
|
|
# filter out falsey values from nodes
|
|
filtered_nodes = [node for node in nodes if node.name]
|
|
|
|
if not filtered_nodes:
|
|
return
|
|
|
|
name_embeddings = await embedder.create_batch([node.name for node in filtered_nodes])
|
|
for node, name_embedding in zip(filtered_nodes, name_embeddings, strict=True):
|
|
node.name_embedding = name_embedding
|