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from typing import Any, Dict, List | |
from pydantic import BaseModel | |
from langchain.memory.chat_memory import BaseChatMemory | |
from langchain.schema import BaseMessage, get_buffer_string | |
class ConversationBufferWindowMemory(BaseChatMemory, BaseModel): | |
"""Buffer for storing conversation memory.""" | |
human_prefix: str = "Human" | |
ai_prefix: str = "AI" | |
memory_key: str = "history" #: :meta private: | |
k: int = 5 | |
def buffer(self) -> List[BaseMessage]: | |
"""String buffer of memory.""" | |
return self.chat_memory.messages | |
def memory_variables(self) -> List[str]: | |
"""Will always return list of memory variables. | |
:meta private: | |
""" | |
return [self.memory_key] | |
def load_memory_variables(self, inputs: Dict[str, Any]) -> Dict[str, str]: | |
"""Return history buffer.""" | |
if self.return_messages: | |
buffer: Any = self.buffer[-self.k * 2 :] | |
else: | |
buffer = get_buffer_string( | |
self.buffer[-self.k * 2 :], | |
human_prefix=self.human_prefix, | |
ai_prefix=self.ai_prefix, | |
) | |
return {self.memory_key: buffer} | |