langchain/vectorstores/sklearn.py/SKLearnVectorStore/_load
class SKLearnVectorStore:    def _load(self) -> None:
        if self._serializer is None:
            raise SKLearnVectorStoreException(
                "You must specify a persist_path on creation to load the " "collection."
            )
        data = self._serializer.load()
        self._embeddings = data["embeddings"]
        self._texts = data["texts"]
        self._metadatas = data["metadatas"]
        self._ids = data["ids"]
        self._update_neighbors()