langchain/docs/snippets/modules/memory/how_to/summary.mdx

```python
from langchain.memory import ConversationSummaryMemory, ChatMessageHistory
from langchain.llms import OpenAI
```


```python
memory = ConversationSummaryMemory(llm=OpenAI(temperature=0))
memory.save_context({"input": "hi"}, {"output": "whats up"})
```


```python
memory.load_memory_variables({})
```

<CodeOutputBlock lang="python">

```
    {'history': '\nThe human greets the AI, to which the AI responds.'}
```

</CodeOutputBlock>

We can also get the history as a list of messages (this is useful if you are using this with a chat model).


```python
memory = ConversationSummaryMemory(llm=OpenAI(temperature=0), return_messages=True)
memory.save_context({"input": "hi"}, {"output": "whats up"})
```


```python
memory.load_memory_variables({})
```

<CodeOutputBlock lang="python">

```
    {'history': [SystemMessage(content='\nThe human greets the AI, to which the AI responds.', additional_kwargs={})]}
```

</CodeOutputBlock>

We can also utilize the `predict_new_summary` method directly.


```python
messages = memory.chat_memory.messages
previous_summary = ""
memory.predict_new_summary(messages, previous_summary)
```

<CodeOutputBlock lang="python">

```
    '\nThe human greets the AI, to which the AI responds.'
```

</CodeOutputBlock>

## Initializing with messages

If you have messages outside this class, you can easily initialize the class with ChatMessageHistory. During loading, a summary will be calculated.


```python
history = ChatMessageHistory()
history.add_user_message("hi")
history.add_ai_message("hi there!")
```


```python
memory = ConversationSummaryMemory.from_messages(llm=OpenAI(temperature=0), chat_memory=history, return_messages=True)
```


```python
memory.buffer
```

<CodeOutputBlock lang="python">

```
    '\nThe human greets the AI, to which the AI responds with a friendly greeting.'
```

</CodeOutputBlock>

## Using in a chain
Let's walk through an example of using this in a chain, again setting `verbose=True` so we can see the prompt.


```python
from langchain.llms import OpenAI
from langchain.chains import ConversationChain
llm = OpenAI(temperature=0)
conversation_with_summary = ConversationChain(
    llm=llm, 
    memory=ConversationSummaryMemory(llm=OpenAI()),
    verbose=True
)
conversation_with_summary.predict(input="Hi, what's up?")
```

<CodeOutputBlock lang="python">

```
    
    
    > 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?"
```

</CodeOutputBlock>


```python
conversation_with_summary.predict(input="Tell me more about it!")
```

<CodeOutputBlock lang="python">

```
    
    
    > 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:
    
    The human greeted the AI and asked how it was doing. The AI replied that it was doing great and was currently helping a customer with a technical issue.
    Human: Tell me more about it!
    AI:
    
    > Finished chain.





    " Sure! The customer is having trouble with their computer not connecting to the internet. I'm helping them troubleshoot the issue and figure out what the problem is. So far, we've tried resetting the router and checking the network settings, but the issue still persists. We're currently looking into other possible solutions."
```

</CodeOutputBlock>


```python
conversation_with_summary.predict(input="Very cool -- what is the scope of the project?")
```

<CodeOutputBlock lang="python">

```
    
    
    > 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:
    
    The human greeted the AI and asked how it was doing. The AI replied that it was doing great and was currently helping a customer with a technical issue where their computer was not connecting to the internet. The AI was troubleshooting the issue and had already tried resetting the router and checking the network settings, but the issue still persisted and they were looking into other possible solutions.
    Human: Very cool -- what is the scope of the project?
    AI:
    
    > Finished chain.





    " The scope of the project is to troubleshoot the customer's computer issue and find a solution that will allow them to connect to the internet. We are currently exploring different possibilities and have already tried resetting the router and checking the network settings, but the issue still persists."
```

</CodeOutputBlock>