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186 | class DenseXRetrievalPack(BaseLlamaPack):
def __init__(
self,
documents: List[Document],
proposition_llm: Optional[LLM] = None,
query_llm: Optional[LLM] = None,
embed_model: Optional[BaseEmbedding] = None,
text_splitter: TextSplitter = SentenceSplitter(),
similarity_top_k: int = 4,
streaming: bool = False,
) -> None:
"""Init params."""
self._proposition_llm = proposition_llm or OpenAI(
model="gpt-3.5-turbo",
temperature=0.1,
max_tokens=750,
)
embed_model = embed_model or OpenAIEmbedding(embed_batch_size=128)
nodes = text_splitter.get_nodes_from_documents(documents)
sub_nodes = self._gen_propositions(nodes)
all_nodes = nodes + sub_nodes
all_nodes_dict = {n.node_id: n for n in all_nodes}
service_context = ServiceContext.from_defaults(
llm=query_llm or OpenAI(),
embed_model=embed_model,
num_output=self._proposition_llm.metadata.num_output,
)
self.vector_index = VectorStoreIndex(
all_nodes, service_context=service_context, show_progress=True
)
self.retriever = RecursiveRetriever(
"vector",
retriever_dict={
"vector": self.vector_index.as_retriever(
similarity_top_k=similarity_top_k
)
},
node_dict=all_nodes_dict,
)
self.query_engine = RetrieverQueryEngine.from_args(
self.retriever,
service_context=service_context,
streaming=streaming,
)
async def _aget_proposition(self, node: TextNode) -> List[TextNode]:
"""Get proposition."""
inital_output = await self._proposition_llm.apredict(
PROPOSITIONS_PROMPT, node_text=node.text
)
outputs = inital_output.split("\n")
all_propositions = []
for output in outputs:
if not output.strip():
continue
if not output.strip().endswith("]"):
if not output.strip().endswith('"') and not output.strip().endswith(
","
):
output = output + '"'
output = output + " ]"
if not output.strip().startswith("["):
if not output.strip().startswith('"'):
output = '"' + output
output = "[ " + output
try:
propositions = json.loads(output)
except Exception:
# fallback to yaml
try:
propositions = yaml.safe_load(output)
except Exception:
# fallback to next output
continue
if not isinstance(propositions, list):
continue
all_propositions.extend(propositions)
assert isinstance(all_propositions, list)
nodes = [TextNode(text=prop) for prop in all_propositions if prop]
return [IndexNode.from_text_node(n, node.node_id) for n in nodes]
def _gen_propositions(self, nodes: List[TextNode]) -> List[TextNode]:
"""Get propositions."""
sub_nodes = asyncio.run(
run_jobs(
[self._aget_proposition(node) for node in nodes],
show_progress=True,
workers=8,
)
)
# Flatten list
return [node for sub_node in sub_nodes for node in sub_node]
def get_modules(self) -> Dict[str, Any]:
"""Get modules."""
return {
"query_engine": self.query_engine,
"retriever": self.retriever,
}
def run(self, query_str: str, **kwargs: Any) -> RESPONSE_TYPE:
"""Run the pipeline."""
return self.query_engine.query(query_str)
|