streaming

[navaneethstabilix]

write a code for streaming a response in fastapi in langraph

[dosubot[bot]]

I found a similar unsolved discussion about issues with streaming in FastAPI, which might be relevant to your query. You can check it out here ^[1].

For implementing streaming responses in FastAPI using LangChain, you can use the stream method provided by the ChatOllama class. Here's an example:

from fastapi import FastAPI
from langchain_ollama import ChatOllama
from fastapi.responses import StreamingResponse

app = FastAPI()

# Instantiate the chat model
llm = ChatOllama(
    model="llama3",
    temperature=0.8,
    num_predict=256,
    # other params ...
)

@app.get("/stream")
async def stream_response():
    messages = [("human", "Return the words Hello World!")]

    async def event_generator():
        for chunk in llm.stream(messages):
            yield chunk

    return StreamingResponse(event_generator(), media_type="text/event-stream")

This code sets up a FastAPI endpoint that streams responses using the ChatOllama model. The StreamingResponse is used to send chunks of data as they are generated, which is useful for real-time applications ^[2].

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[navaneethstabilix]

chunk = chunk.encode(self.charset)

AttributeError: 'AIMessageChunk' object has no attribute 'encode'

error in above code