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152 | class RelytVectorStore(BasePydanticVectorStore):
"""Relyt向量存储。
示例:
`pip install llama-index-vector-stores-relyt`
```python
from llama_index.vector_stores.relyt import RelytVectorStore
# 设置relyt客户端
from pgvecto_rs.sdk import PGVectoRs
import os
URL = "postgresql+psycopg://{username}:{password}@{host}:{port}/{db_name}".format(
port=os.getenv("RELYT_PORT", "5432"),
host=os.getenv("RELYT_HOST", "localhost"),
username=os.getenv("RELYT_USER", "postgres"),
password=os.getenv("RELYT_PASS", "mysecretpassword"),
db_name=os.getenv("RELYT_NAME", "postgres"),
)
client = PGVectoRs(
db_url=URL,
collection_name="example",
dimension=1536, # 使用OpenAI的文本嵌入-ada-002
)
# 初始化RelytVectorStore
vector_store = RelytVectorStore(client=client)
```"""
stores_text = True
_client: "PGVectoRs" = PrivateAttr()
_collection_name: str = PrivateAttr()
def __init__(self, client: "PGVectoRs", collection_name: str) -> None:
self._client: PGVectoRs = client
self._collection_name = collection_name
self.init_index()
super().__init__()
@classmethod
def class_name(cls) -> str:
return "RelytStore"
def init_index(self):
index_name = f"idx_{self._collection_name}_embedding"
with self._client._engine.connect() as conn:
with conn.begin():
index_query = text(
f"""
SELECT 1
FROM pg_indexes
WHERE indexname = '{index_name}';
"""
)
result = conn.execute(index_query).scalar()
if not result:
index_statement = text(
f"""
CREATE INDEX {index_name}
ON collection_{self._collection_name}
USING vectors (embedding vector_l2_ops)
WITH (options = $$
optimizing.optimizing_threads = 30
segment.max_growing_segment_size = 2000
segment.max_sealed_segment_size = 30000000
[indexing.hnsw]
m=30
ef_construction=500
$$);
"""
)
conn.execute(index_statement)
@property
def client(self) -> Any:
return self._client
def add(
self,
nodes: List[BaseNode],
) -> List[str]:
records = [
Record(
id=node.id_,
text=node.get_content(metadata_mode=MetadataMode.NONE),
meta=node_to_metadata_dict(node, remove_text=True),
embedding=node.get_embedding(),
)
for node in nodes
]
self._client.insert(records)
return [node.id_ for node in nodes]
def delete(self, ref_doc_id: str, **delete_kwargs: Any) -> None:
self._client.delete(meta_contains({"ref_doc_id": ref_doc_id}))
def drop(self) -> None:
self._client.drop()
# TODO: the more filter type(le, ne, ge ...) will add later, after the base api supported,
# now only support eq filter for meta information
def query(self, query: VectorStoreQuery, **kwargs: Any) -> VectorStoreQueryResult:
results = self._client.search(
embedding=query.query_embedding,
top_k=query.similarity_top_k,
filter=(
meta_contains(
{pair.key: pair.value for pair in query.filters.legacy_filters()}
)
if query.filters is not None
else None
),
)
nodes = [
metadata_dict_to_node(record.meta, text=record.text)
for record, _ in results
]
return VectorStoreQueryResult(
nodes=nodes,
similarities=[score for _, score in results],
ids=[str(record.id) for record, _ in results],
)
|