mirror of
https://github.com/hwchase17/langchain
synced 2024-11-11 19:11:02 +00:00
0f7569ddbc
Feedback that `RunnableWithMessageHistory` is unwieldy compared to
ConversationChain and similar legacy abstractions is common.
Legacy chains using memory typically had no explicit notion of threads
or separate sessions. To use `RunnableWithMessageHistory`, users are
forced to introduce this concept into their code. This possibly felt
like unnecessary boilerplate.
Here we enable `RunnableWithMessageHistory` to run without a config if
the `get_session_history` callable has no arguments. This enables
minimal implementations like the following:
```python
from langchain_core.chat_history import InMemoryChatMessageHistory
from langchain_core.runnables.history import RunnableWithMessageHistory
from langchain_openai import ChatOpenAI
llm = ChatOpenAI(model="gpt-3.5-turbo-0125")
memory = InMemoryChatMessageHistory()
chain = RunnableWithMessageHistory(llm, lambda: memory)
chain.invoke("Hi I'm Bob") # Hello Bob!
chain.invoke("What is my name?") # Your name is Bob.
```
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| .. | ||
| __init__.py | ||
| base.py | ||
| branch.py | ||
| config.py | ||
| configurable.py | ||
| fallbacks.py | ||
| graph_ascii.py | ||
| graph_mermaid.py | ||
| graph_png.py | ||
| graph.py | ||
| history.py | ||
| learnable.py | ||
| passthrough.py | ||
| retry.py | ||
| router.py | ||
| schema.py | ||
| utils.py | ||