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implement on_llm_new_token to support streaming of responses #3497

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merged 1 commit into from
Apr 25, 2023
Merged

implement on_llm_new_token to support streaming of responses #3497

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8 changes: 6 additions & 2 deletions langchain/callbacks/streamlit.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,9 @@

class StreamlitCallbackHandler(BaseCallbackHandler):
"""Callback Handler that logs to streamlit."""
def __init__(self) -> None:
self.tokens_area = st.empty()
self.tokens_stream = ""

def on_llm_start(
self, serialized: Dict[str, Any], prompts: List[str], **kwargs: Any
Expand All @@ -19,8 +22,9 @@ def on_llm_start(
st.write(prompt)

def on_llm_new_token(self, token: str, **kwargs: Any) -> None:
"""Do nothing."""
pass
"""Run on new LLM token. Only available when streaming is enabled."""
self.tokens_stream += token
self.tokens_area.write(self.tokens_stream)

def on_llm_end(self, response: LLMResult, **kwargs: Any) -> None:
"""Do nothing."""
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