132 lines
4.8 KiB
Python
132 lines
4.8 KiB
Python
from typing import List, Dict, Optional
|
|
|
|
from langchain.embeddings.base import Embeddings
|
|
from langchain.schema import Document
|
|
from langchain.vectorstores import Milvus
|
|
from pymilvus import connections
|
|
|
|
from configs import kbs_config
|
|
|
|
from server.knowledge_base.kb_service.base import KBService, SupportedVSType, EmbeddingsFunAdapter, \
|
|
score_threshold_process
|
|
from server.knowledge_base.utils import KnowledgeFile
|
|
|
|
|
|
class MilvusKBService(KBService):
|
|
milvus: Milvus
|
|
|
|
@staticmethod
|
|
def get_collection(milvus_name):
|
|
from pymilvus import Collection
|
|
return Collection(milvus_name)
|
|
|
|
# def save_vector_store(self):
|
|
# if self.milvus.col:
|
|
# self.milvus.col.flush()
|
|
|
|
def get_doc_by_id(self, id: str) -> Optional[Document]:
|
|
if self.milvus.col:
|
|
data_list = self.milvus.col.query(expr=f'pk == {id}', output_fields=["*"])
|
|
if len(data_list) > 0:
|
|
data = data_list[0]
|
|
text = data.pop("text")
|
|
return Document(page_content=text, metadata=data)
|
|
|
|
@staticmethod
|
|
def search(milvus_name, content, limit=3):
|
|
search_params = {
|
|
"metric_type": "L2",
|
|
"params": {"nprobe": 10},
|
|
}
|
|
print(content)
|
|
c = MilvusKBService.get_collection(milvus_name)
|
|
r = c.search(content, "embeddings", search_params, limit=limit, output_fields=["content"])
|
|
return r
|
|
|
|
def search_all(self, query, limit=3):
|
|
connections.connect("default", host="localhost", port="19530")
|
|
embedding_function = EmbeddingsFunAdapter(self._load_embeddings())
|
|
search_params = {
|
|
"metric_type": "L2",
|
|
"params": {"nprobe": 10},
|
|
}
|
|
content = [embedding_function.embed_query(query)]
|
|
c = MilvusKBService.get_collection(self.kb_name)
|
|
r = c.search(content, "vector", search_params, limit=limit, output_fields=["*"])
|
|
return r
|
|
|
|
def do_delete_one_doc(self, pk):
|
|
if self.milvus.col:
|
|
self.milvus.col.delete(expr=f'pk in [{pk}]')
|
|
print("delete success")
|
|
|
|
def do_create_kb(self):
|
|
pass
|
|
|
|
def vs_type(self) -> str:
|
|
return SupportedVSType.MILVUS
|
|
|
|
def _load_milvus(self, embeddings: Embeddings = None):
|
|
if embeddings is None:
|
|
self.embeddings = self._load_embeddings()
|
|
embeddings = self.embeddings
|
|
self.milvus = Milvus(embedding_function=EmbeddingsFunAdapter(embeddings),
|
|
collection_name=self.kb_name, connection_args=kbs_config.get("milvus"))
|
|
|
|
def do_init(self):
|
|
self._load_milvus()
|
|
|
|
def do_drop_kb(self):
|
|
if self.milvus.col:
|
|
self.milvus.col.release()
|
|
self.milvus.col.drop()
|
|
|
|
def do_search(self, query: str, top_k: int, score_threshold: float, embeddings: Embeddings):
|
|
self._load_milvus(embeddings=EmbeddingsFunAdapter(embeddings))
|
|
# similarity_search_with_score使用带分数的进行搜索
|
|
return score_threshold_process(score_threshold, top_k, self.milvus.similarity_search_with_score(query, top_k))
|
|
|
|
def do_search_all(self, query: str, top_k: int, score_threshold: float, embeddings: Embeddings):
|
|
r = self.search_all(query, top_k)
|
|
return r
|
|
|
|
def do_add_doc(self, docs: List[Document], **kwargs) -> List[Dict]:
|
|
# TODO: workaround for bug #10492 in langchain
|
|
for doc in docs:
|
|
for k, v in doc.metadata.items():
|
|
doc.metadata[k] = str(v)
|
|
for field in self.milvus.fields:
|
|
doc.metadata.setdefault(field, "")
|
|
doc.metadata.pop(self.milvus._text_field, None)
|
|
doc.metadata.pop(self.milvus._vector_field, None)
|
|
|
|
|
|
ids = self.milvus.add_documents(docs)
|
|
doc_infos = [{"id": id, "metadata": doc.metadata} for id, doc in zip(ids, docs)]
|
|
return doc_infos
|
|
|
|
def do_delete_doc(self, kb_file: KnowledgeFile, **kwargs):
|
|
if self.milvus.col:
|
|
filepath = kb_file.filepath.replace('\\', '\\\\')
|
|
delete_list = [item.get("pk") for item in
|
|
self.milvus.col.query(expr=f'source == "{filepath}"', output_fields=["pk"])]
|
|
self.milvus.col.delete(expr=f'pk in {delete_list}')
|
|
|
|
def do_clear_vs(self):
|
|
if self.milvus.col:
|
|
self.do_drop_kb()
|
|
self.do_init()
|
|
|
|
|
|
if __name__ == '__main__':
|
|
# 测试建表使用
|
|
from server.db.base import Base, engine
|
|
|
|
Base.metadata.create_all(bind=engine)
|
|
milvusService = MilvusKBService("test")
|
|
# milvusService.add_doc(KnowledgeFile("README.md", "test"))
|
|
|
|
print(milvusService.get_doc_by_id("445466355570849011"))
|
|
# milvusService.delete_doc(KnowledgeFile("README.md", "test"))
|
|
# milvusService.do_drop_kb()
|