Files
browser-use/browser_use/agent/memory/service.py
2025-04-09 18:51:44 -07:00

133 lines
4.5 KiB
Python

from __future__ import annotations
import logging
from typing import List, Optional
from langchain_core.language_models.chat_models import BaseChatModel
from langchain_core.messages import (
BaseMessage,
HumanMessage,
)
from langchain_core.messages.utils import convert_to_openai_messages
from mem0 import Memory as Mem0Memory
from pydantic import BaseModel
from browser_use.agent.message_manager.service import MessageManager
from browser_use.agent.message_manager.views import ManagedMessage, MessageMetadata
from browser_use.utils import time_execution_sync
logger = logging.getLogger(__name__)
class MemorySettings(BaseModel):
"""Settings for procedural memory."""
agent_id: str
interval: int = 10
config: Optional[dict] | None = None
class Memory:
"""
Manages procedural memory for agents.
This class implements a procedural memory management system using Mem0 that transforms agent interaction history
into concise, structured representations at specified intervals. It serves to optimize context window
utilization during extended task execution by converting verbose historical information into compact,
yet comprehensive memory constructs that preserve essential operational knowledge.
"""
# Default configuration values as class constants
DEFAULT_VECTOR_STORE = {'provider': 'faiss', 'config': {'embedding_model_dims': 384}}
DEFAULT_EMBEDDER = {'provider': 'huggingface', 'config': {'model': 'all-MiniLM-L6-v2'}}
def __init__(
self,
message_manager: MessageManager,
llm: BaseChatModel,
settings: MemorySettings,
):
self.message_manager = message_manager
self.llm = llm
self.settings = settings
self._memory_config = self.settings.config or self._get_default_config(llm)
self.mem0 = Mem0Memory.from_config(config_dict=self._memory_config)
@staticmethod
def _get_default_config(llm: BaseChatModel) -> dict:
"""Returns the default configuration for memory."""
return {
'vector_store': Memory.DEFAULT_VECTOR_STORE,
'llm': {'provider': 'langchain', 'config': {'model': llm}},
'embedder': Memory.DEFAULT_EMBEDDER,
}
@time_execution_sync('--create_procedural_memory')
def create_procedural_memory(self, current_step: int) -> None:
"""
Create a procedural memory if needed based on the current step.
Args:
current_step: The current step number of the agent
"""
logger.info(f'Creating procedural memory at step {current_step}')
# Get all messages
all_messages = self.message_manager.state.history.messages
# Separate messages into those to keep as-is and those to process for memory
new_messages = []
messages_to_process = []
for msg in all_messages:
if isinstance(msg, ManagedMessage) and msg.metadata.message_type in {'init', 'memory'}:
# Keep system and memory messages as they are
new_messages.append(msg)
else:
if len(msg.message.content) > 0:
messages_to_process.append(msg)
# Need at least 2 messages to create a meaningful summary
if len(messages_to_process) <= 1:
logger.info('Not enough non-memory messages to summarize')
return
# Create a procedural memory
memory_content = self._create([m.message for m in messages_to_process], current_step)
if not memory_content:
logger.warning('Failed to create procedural memory')
return
# Replace the processed messages with the consolidated memory
memory_message = HumanMessage(content=memory_content)
memory_tokens = self.message_manager._count_tokens(memory_message)
memory_metadata = MessageMetadata(tokens=memory_tokens, message_type='memory')
# Calculate the total tokens being removed
removed_tokens = sum(m.metadata.tokens for m in messages_to_process)
# Add the memory message
new_messages.append(ManagedMessage(message=memory_message, metadata=memory_metadata))
# Update the history
self.message_manager.state.history.messages = new_messages
self.message_manager.state.history.current_tokens -= removed_tokens
self.message_manager.state.history.current_tokens += memory_tokens
logger.info(f'Messages consolidated: {len(messages_to_process)} messages converted to procedural memory')
def _create(self, messages: List[BaseMessage], current_step: int) -> Optional[str]:
parsed_messages = convert_to_openai_messages(messages)
try:
results = self.mem0.add(
messages=parsed_messages,
agent_id=self.settings.agent_id,
memory_type='procedural_memory',
metadata={'step': current_step},
)
if len(results.get('results', [])):
return results.get('results', [])[0].get('memory')
return None
except Exception as e:
logger.error(f'Error creating procedural memory: {e}')
return None