langchain/vectorstores/chroma.py/Chroma/add_texts
class Chroma:    def add_texts(
        self,
        texts: Iterable[str],
        metadatas: Optional[List[dict]] = None,
        ids: Optional[List[str]] = None,
        **kwargs: Any,
    ) -> List[str]:
        """Run more texts through the embeddings and add to the vectorstore.

        Args:
            texts (Iterable[str]): Texts to add to the vectorstore.
            metadatas (Optional[List[dict]], optional): Optional list of metadatas.
            ids (Optional[List[str]], optional): Optional list of IDs.

        Returns:
            List[str]: List of IDs of the added texts.
        """
        # TODO: Handle the case where the user doesn't provide ids on the Collection
        if ids is None:
            ids = [str(uuid.uuid1()) for _ in texts]
        embeddings = None
        if self._embedding_function is not None:
            embeddings = self._embedding_function.embed_documents(list(texts))
        self._collection.add(
            metadatas=metadatas, embeddings=embeddings, documents=texts, ids=ids
        )
        return ids