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Update MyFAISS.py (#1041) 

* Update MyFAISS.py

使用remove_ids从faiss索引中删除向量时，索引中剩余的待索引向量idx仍然是连续的  0, 3, 4 - > 0, 1, 2

#为了保证index_to_docstore_id中的idx和faiss索引中的idx相一致，需要将index_to_docstore_id中的idx重排序

* Update MyFAISS.py
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Chiquitita 2023-08-10 21:54:42 +08:00 committed by GitHub
parent 3db73d458b
commit 22c6192561
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vectorstores/MyFAISS.py
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@ -132,11 +132,19 @@ class MyFAISS(FAISS, VectorStore):
_reversed_index = {v: k for k, v in self.index_to_docstore_id.items()}
index_to_delete = [_reversed_index[i] for i in ids]
# 从 self.index 中删除对应id
# 使用remove_ids从faiss索引中删除向量时，剩余的待索引向量idx仍然是连续的 0, 3, 4 - > 0, 1, 2
self.index.remove_ids(np.array(index_to_delete, dtype=np.int64))
for id in ids:
index = list(self.index_to_docstore_id.keys())[list(self.index_to_docstore_id.values()).index(id)]
self.index_to_docstore_id.pop(index)
self.docstore._dict.pop(id)
#为了保证index_to_docstore_id中的idx和faiss索引中的向量idx相一致，需要将index_to_docstore_id中的idx重排序
index_to_docstore_id_items = sorted(self.index_to_docstore_id.items())#0, 1, 3 - > 0, 1, 2
for i in range(len(index_to_docstore_id_items)):
index_to_docstore_id_items[i] = (i, index_to_docstore_id_items[i][1])
self.index_to_docstore_id.clear()
self.index_to_docstore_id.update(index_to_docstore_id_items)
self.save_local(vs_path)
return f"docs delete success"
except Exception as e: