forked from Archives/langchain
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
"""Callback Handler that logs to streamlit."""
|
|
from typing import Any, Dict, List, Optional, Union
|
|
|
|
import streamlit as st
|
|
|
|
from langchain.callbacks.base import BaseCallbackHandler
|
|
from langchain.schema import AgentAction, AgentFinish, LLMResult
|
|
|
|
|
|
class StreamlitCallbackHandler(BaseCallbackHandler):
|
|
"""Callback Handler that logs to streamlit."""
|
|
|
|
def on_llm_start(
|
|
self, serialized: Dict[str, Any], prompts: List[str], **kwargs: Any
|
|
) -> None:
|
|
"""Print out the prompts."""
|
|
st.write("Prompts after formatting:")
|
|
for prompt in prompts:
|
|
st.write(prompt)
|
|
|
|
def on_llm_end(self, response: LLMResult, **kwargs: Any) -> None:
|
|
"""Do nothing."""
|
|
pass
|
|
|
|
def on_llm_error(
|
|
self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
|
|
) -> None:
|
|
"""Do nothing."""
|
|
pass
|
|
|
|
def on_chain_start(
|
|
self, serialized: Dict[str, Any], inputs: Dict[str, Any], **kwargs: Any
|
|
) -> None:
|
|
"""Print out that we are entering a chain."""
|
|
class_name = serialized["name"]
|
|
st.write(f"Entering new {class_name} chain...")
|
|
|
|
def on_chain_end(self, outputs: Dict[str, Any], **kwargs: Any) -> None:
|
|
"""Print out that we finished a chain."""
|
|
st.write("Finished chain.")
|
|
|
|
def on_chain_error(
|
|
self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
|
|
) -> None:
|
|
"""Do nothing."""
|
|
pass
|
|
|
|
def on_tool_start(
|
|
self,
|
|
serialized: Dict[str, Any],
|
|
action: AgentAction,
|
|
**kwargs: Any,
|
|
) -> None:
|
|
"""Print out the log in specified color."""
|
|
# st.write requires two spaces before a newline to render it
|
|
st.markdown(action.log.replace("\n", " \n"))
|
|
|
|
def on_tool_end(
|
|
self,
|
|
output: str,
|
|
observation_prefix: Optional[str] = None,
|
|
llm_prefix: Optional[str] = None,
|
|
**kwargs: Any,
|
|
) -> None:
|
|
"""If not the final action, print out observation."""
|
|
st.write(f"{observation_prefix}{output}")
|
|
st.write(llm_prefix)
|
|
|
|
def on_tool_error(
|
|
self, error: Union[Exception, KeyboardInterrupt], **kwargs: Any
|
|
) -> None:
|
|
"""Do nothing."""
|
|
pass
|
|
|
|
def on_text(self, text: str, **kwargs: Any) -> None:
|
|
"""Run on text."""
|
|
# st.write requires two spaces before a newline to render it
|
|
st.write(text.replace("\n", " \n"))
|
|
|
|
def on_agent_finish(self, finish: AgentFinish, **kwargs: Any) -> None:
|
|
"""Run on agent end."""
|
|
# st.write requires two spaces before a newline to render it
|
|
st.write(finish.log.replace("\n", " \n"))
|