回调处理器，使 Chainlit 能够在 UI 中显示中间步骤。

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用法

代码示例
from llama_index.core.callbacks import CallbackManager
from llama_index.core.service_context import ServiceContext
import chainlit as cl



@cl.on_chat_start
async def start():
    service_context = ServiceContext.from_defaults(callback_manager=CallbackManager([cl.LlamaIndexCallbackHandler()]))
    # use the service context to create the predictor