基类：EventBaseRetriever
路径检索器。
Pathway 是一个开源数据处理框架。
它允许您轻松开发能够处理实时数据源和变化数据的数据转换流水线。
这是为PathwayVectorServer实现检索器API的客户端。
workflows/handler.py 中的源代码llama_index/retrievers/pathway/base.py
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153 | class PathwayRetriever(BaseRetriever):
"""
Pathway retriever.
Pathway is an open data processing framework.
It allows you to easily develop data transformation pipelines
that work with live data sources and changing data.
This is the client that implements Retriever API for PathwayVectorServer.
"""
def __init__(
self,
host: Optional[str] = None,
port: Optional[int] = None,
url: Optional[str] = None,
similarity_top_k: int = DEFAULT_SIMILARITY_TOP_K,
callback_manager: Optional[CallbackManager] = None,
) -> None:
"""Initializing the Pathway retriever client."""
self.client = _VectorStoreClient(host, port, url)
self.similarity_top_k = similarity_top_k
super().__init__(callback_manager)
def _retrieve(self, query_bundle: QueryBundle) -> List[NodeWithScore]:
"""Retrieve."""
rets = self.client(query=query_bundle.query_str, k=self.similarity_top_k)
items = [
NodeWithScore(
node=TextNode(text=ret["text"], extra_info=ret["metadata"]),
# Transform cosine distance into a similairty score
# (higher is more similar)
score=1 - ret["dist"],
)
for ret in rets
]
return sorted(items, key=lambda x: x.score or 0.0, reverse=True)
|