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ConversationBufferWindowMemory 保存一段时间内对话交互的列表。它仅使用最后 K 个交互。这对于保持最近交互的滑动窗口非常有用，因此缓冲区不会变得太大。

我们首先来探讨一下这种存储器的基本功能。

示例代码，

from langchain.memory import ConversationBufferWindowMemory

memory = ConversationBufferWindowMemory( k=1)
memory.save_context({"input": "hi"}, {"output": "whats up"})
memory.save_context({"input": "not much you"}, {"output": "not much"})

memory.load_memory_variables({})

输出结果，

    {'history': 'Human: not much you\nAI: not much'}

我们还可以获取历史记录作为消息列表（如果您将其与聊天模型一起使用，这非常有用）。

示例代码，

memory = ConversationBufferWindowMemory( k=1, return_messages=True)
memory.save_context({"input": "hi"}, {"output": "whats up"})
memory.save_context({"input": "not much you"}, {"output": "not much"})

memory.load_memory_variables({})

输出结果，

    {'history': [HumanMessage(content='not much you', additional_kwargs={}),AIMessage(content='not much', additional_kwargs={})]}

Using in a chain

让我们看一下示例，再次设置 verbose=True 以便我们可以看到提示。

from langchain.llms import OpenAI
from langchain.chains import ConversationChain
conversation_with_summary = ConversationChain(llm=OpenAI(temperature=0), # We set a low k=2, to only keep the last 2 interactions in memorymemory=ConversationBufferWindowMemory(k=2), verbose=True
)
conversation_with_summary.predict(input="Hi, what's up?")

输出结果，

    > Entering new ConversationChain chain...Prompt after formatting:The following is a friendly conversation between a human and an AI. The AI is talkative and provides lots of specific details from its context. If the AI does not know the answer to a question, it truthfully says it does not know.Current conversation:Human: Hi, what's up?AI:> Finished chain." Hi there! I'm doing great. I'm currently helping a customer with a technical issue. How about you?"

示例代码，

conversation_with_summary.predict(input="What's their issues?")

输出结果，

    > Entering new ConversationChain chain...Prompt after formatting:The following is a friendly conversation between a human and an AI. The AI is talkative and provides lots of specific details from its context. If the AI does not know the answer to a question, it truthfully says it does not know.Current conversation:Human: Hi, what's up?AI:  Hi there! I'm doing great. I'm currently helping a customer with a technical issue. How about you?Human: What's their issues?AI:> Finished chain." The customer is having trouble connecting to their Wi-Fi network. I'm helping them troubleshoot the issue and get them connected."

示例代码，

conversation_with_summary.predict(input="Is it going well?")

输出结果，

    > Entering new ConversationChain chain...Prompt after formatting:The following is a friendly conversation between a human and an AI. The AI is talkative and provides lots of specific details from its context. If the AI does not know the answer to a question, it truthfully says it does not know.Current conversation:Human: Hi, what's up?AI:  Hi there! I'm doing great. I'm currently helping a customer with a technical issue. How about you?Human: What's their issues?AI:  The customer is having trouble connecting to their Wi-Fi network. I'm helping them troubleshoot the issue and get them connected.Human: Is it going well?AI:> Finished chain." Yes, it's going well so far. We've already identified the problem and are now working on a solution."

示例代码，

# Notice here that the first interaction does not appear.
conversation_with_summary.predict(input="What's the solution?")

输出结果，

    > Entering new ConversationChain chain...Prompt after formatting:The following is a friendly conversation between a human and an AI. The AI is talkative and provides lots of specific details from its context. If the AI does not know the answer to a question, it truthfully says it does not know.Current conversation:Human: What's their issues?AI:  The customer is having trouble connecting to their Wi-Fi network. I'm helping them troubleshoot the issue and get them connected.Human: Is it going well?AI:  Yes, it's going well so far. We've already identified the problem and are now working on a solution.Human: What's the solution?AI:> Finished chain." The solution is to reset the router and reconfigure the settings. We're currently in the process of doing that."

完结！