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238 | class TreeSummarize(BaseSynthesizer):
"""
Tree summarize response builder.
This response builder recursively merges text chunks and summarizes them
in a bottom-up fashion (i.e. building a tree from leaves to root).
More concretely, at each recursively step:
1. we repack the text chunks so that each chunk fills the context window of the LLM
2. if there is only one chunk, we give the final response
3. otherwise, we summarize each chunk and recursively summarize the summaries.
"""
def __init__(
self,
llm: Optional[LLMPredictorType] = None,
callback_manager: Optional[CallbackManager] = None,
prompt_helper: Optional[PromptHelper] = None,
summary_template: Optional[BasePromptTemplate] = None,
output_cls: Optional[BaseModel] = None,
streaming: bool = False,
use_async: bool = False,
verbose: bool = False,
# deprecated
service_context: Optional[ServiceContext] = None,
) -> None:
if service_context is not None:
prompt_helper = service_context.prompt_helper
super().__init__(
llm=llm,
callback_manager=callback_manager,
prompt_helper=prompt_helper,
service_context=service_context,
streaming=streaming,
output_cls=output_cls,
)
self._summary_template = summary_template or DEFAULT_TREE_SUMMARIZE_PROMPT_SEL
self._use_async = use_async
self._verbose = verbose
def _get_prompts(self) -> PromptDictType:
"""Get prompts."""
return {"summary_template": self._summary_template}
def _update_prompts(self, prompts: PromptDictType) -> None:
"""Update prompts."""
if "summary_template" in prompts:
self._summary_template = prompts["summary_template"]
async def aget_response(
self,
query_str: str,
text_chunks: Sequence[str],
**response_kwargs: Any,
) -> RESPONSE_TEXT_TYPE:
"""Get tree summarize response."""
summary_template = self._summary_template.partial_format(query_str=query_str)
# repack text_chunks so that each chunk fills the context window
text_chunks = self._prompt_helper.repack(
summary_template, text_chunks=text_chunks
)
if self._verbose:
print(f"{len(text_chunks)} text chunks after repacking")
# give final response if there is only one chunk
if len(text_chunks) == 1:
response: RESPONSE_TEXT_TYPE
if self._streaming:
response = await self._llm.astream(
summary_template, context_str=text_chunks[0], **response_kwargs
)
else:
if self._output_cls is None:
response = await self._llm.apredict(
summary_template,
context_str=text_chunks[0],
**response_kwargs,
)
else:
response = await self._llm.astructured_predict(
self._output_cls,
summary_template,
context_str=text_chunks[0],
**response_kwargs,
)
# return pydantic object if output_cls is specified
return response
else:
# summarize each chunk
if self._output_cls is None:
tasks = [
self._llm.apredict(
summary_template,
context_str=text_chunk,
**response_kwargs,
)
for text_chunk in text_chunks
]
else:
tasks = [
self._llm.astructured_predict(
self._output_cls,
summary_template,
context_str=text_chunk,
**response_kwargs,
)
for text_chunk in text_chunks
]
summary_responses = await asyncio.gather(*tasks)
if self._output_cls is not None:
summaries = [summary.json() for summary in summary_responses]
else:
summaries = summary_responses
# recursively summarize the summaries
return await self.aget_response(
query_str=query_str,
text_chunks=summaries,
**response_kwargs,
)
def get_response(
self,
query_str: str,
text_chunks: Sequence[str],
**response_kwargs: Any,
) -> RESPONSE_TEXT_TYPE:
"""Get tree summarize response."""
summary_template = self._summary_template.partial_format(query_str=query_str)
# repack text_chunks so that each chunk fills the context window
text_chunks = self._prompt_helper.repack(
summary_template, text_chunks=text_chunks
)
if self._verbose:
print(f"{len(text_chunks)} text chunks after repacking")
# give final response if there is only one chunk
if len(text_chunks) == 1:
response: RESPONSE_TEXT_TYPE
if self._streaming:
response = self._llm.stream(
summary_template, context_str=text_chunks[0], **response_kwargs
)
else:
if self._output_cls is None:
response = self._llm.predict(
summary_template,
context_str=text_chunks[0],
**response_kwargs,
)
else:
response = self._llm.structured_predict(
self._output_cls,
summary_template,
context_str=text_chunks[0],
**response_kwargs,
)
return response
else:
# summarize each chunk
if self._use_async:
if self._output_cls is None:
tasks = [
self._llm.apredict(
summary_template,
context_str=text_chunk,
**response_kwargs,
)
for text_chunk in text_chunks
]
else:
tasks = [
self._llm.astructured_predict(
self._output_cls,
summary_template,
context_str=text_chunk,
**response_kwargs,
)
for text_chunk in text_chunks
]
summary_responses = run_async_tasks(tasks)
if self._output_cls is not None:
summaries = [summary.json() for summary in summary_responses]
else:
summaries = summary_responses
else:
if self._output_cls is None:
summaries = [
self._llm.predict(
summary_template,
context_str=text_chunk,
**response_kwargs,
)
for text_chunk in text_chunks
]
else:
summaries = [
self._llm.structured_predict(
self._output_cls,
summary_template,
context_str=text_chunk,
**response_kwargs,
)
for text_chunk in text_chunks
]
summaries = [summary.json() for summary in summaries]
# recursively summarize the summaries
return self.get_response(
query_str=query_str, text_chunks=summaries, **response_kwargs
)
|