Document summary

LlamaIndex data structures.

DocumentSummaryIndex

Bases: BaseIndex[IndexDocumentSummary]

Document Summary Index.

Parameters:

Name	Type	Description	Default
response_synthesizer	BaseSynthesizer	A response synthesizer for generating summaries.	None
summary_query	str	The query to use to generate the summary for each document.	DEFAULT_SUMMARY_QUERY
show_progress	bool	Whether to show tqdm progress bars. Defaults to False.	False
embed_summaries	bool	Whether to embed the summaries. This is required for running the default embedding-based retriever. Defaults to True.	True

Source code in llama-index-core/llama_index/core/indices/document_summary/base.py

class DocumentSummaryIndex(BaseIndex[IndexDocumentSummary]):
    """Document Summary Index.

    Args:
        response_synthesizer (BaseSynthesizer): A response synthesizer for generating
            summaries.
        summary_query (str): The query to use to generate the summary for each document.
        show_progress (bool): Whether to show tqdm progress bars.
            Defaults to False.
        embed_summaries (bool): Whether to embed the summaries.
            This is required for running the default embedding-based retriever.
            Defaults to True.

    """

    index_struct_cls = IndexDocumentSummary

    def __init__(
        self,
        nodes: Optional[Sequence[BaseNode]] = None,
        objects: Optional[Sequence[IndexNode]] = None,
        index_struct: Optional[IndexDocumentSummary] = None,
        llm: Optional[LLM] = None,
        embed_model: Optional[BaseEmbedding] = None,
        storage_context: Optional[StorageContext] = None,
        response_synthesizer: Optional[BaseSynthesizer] = None,
        summary_query: str = DEFAULT_SUMMARY_QUERY,
        show_progress: bool = False,
        embed_summaries: bool = True,
        **kwargs: Any,
    ) -> None:
        """Initialize params."""
        self._llm = llm or Settings.llm
        self._embed_model = embed_model or Settings.embed_model
        self._response_synthesizer = response_synthesizer or get_response_synthesizer(
            llm=self._llm, response_mode=ResponseMode.TREE_SUMMARIZE
        )
        self._summary_query = summary_query
        self._embed_summaries = embed_summaries

        super().__init__(
            nodes=nodes,
            index_struct=index_struct,
            storage_context=storage_context,
            show_progress=show_progress,
            objects=objects,
            **kwargs,
        )

    @property
    def vector_store(self) -> BasePydanticVectorStore:
        return self._vector_store

    def as_retriever(
        self,
        retriever_mode: Union[str, _RetrieverMode] = _RetrieverMode.EMBEDDING,
        **kwargs: Any,
    ) -> BaseRetriever:
        """Get retriever.

        Args:
            retriever_mode (Union[str, DocumentSummaryRetrieverMode]): A retriever mode.
                Defaults to DocumentSummaryRetrieverMode.EMBEDDING.

        """
        from llama_index.core.indices.document_summary.retrievers import (
            DocumentSummaryIndexEmbeddingRetriever,
            DocumentSummaryIndexLLMRetriever,
        )

        LLMRetriever = DocumentSummaryIndexLLMRetriever
        EmbeddingRetriever = DocumentSummaryIndexEmbeddingRetriever

        if retriever_mode == _RetrieverMode.EMBEDDING:
            if not self._embed_summaries:
                raise ValueError(
                    "Cannot use embedding retriever if embed_summaries is False"
                )

            return EmbeddingRetriever(
                self,
                object_map=self._object_map,
                embed_model=self._embed_model,
                **kwargs,
            )
        if retriever_mode == _RetrieverMode.LLM:
            return LLMRetriever(
                self, object_map=self._object_map, llm=self._llm, **kwargs
            )
        else:
            raise ValueError(f"Unknown retriever mode: {retriever_mode}")

    def get_document_summary(self, doc_id: str) -> str:
        """Get document summary by doc id.

        Args:
            doc_id (str): A document id.

        """
        if doc_id not in self._index_struct.doc_id_to_summary_id:
            raise ValueError(f"doc_id {doc_id} not in index")
        summary_id = self._index_struct.doc_id_to_summary_id[doc_id]
        return self.docstore.get_node(summary_id).get_content()

    def _add_nodes_to_index(
        self,
        index_struct: IndexDocumentSummary,
        nodes: Sequence[BaseNode],
        show_progress: bool = False,
    ) -> None:
        """Add nodes to index."""
        doc_id_to_nodes = defaultdict(list)
        for node in nodes:
            if node.ref_doc_id is None:
                raise ValueError(
                    "ref_doc_id of node cannot be None when building a document "
                    "summary index"
                )
            doc_id_to_nodes[node.ref_doc_id].append(node)

        summary_node_dict = {}
        items = doc_id_to_nodes.items()
        iterable_with_progress = get_tqdm_iterable(
            items, show_progress, "Summarizing documents"
        )

        for doc_id, nodes in iterable_with_progress:
            print(f"current doc id: {doc_id}")
            nodes_with_scores = [NodeWithScore(node=n) for n in nodes]
            # get the summary for each doc_id
            summary_response = self._response_synthesizer.synthesize(
                query=self._summary_query,
                nodes=nodes_with_scores,
            )
            summary_response = cast(Response, summary_response)
            docid_first_node = doc_id_to_nodes.get(doc_id, [TextNode()])[0]
            summary_node_dict[doc_id] = TextNode(
                text=summary_response.response,
                relationships={
                    NodeRelationship.SOURCE: RelatedNodeInfo(node_id=doc_id)
                },
                metadata=docid_first_node.metadata,
                excluded_embed_metadata_keys=docid_first_node.excluded_embed_metadata_keys,
                excluded_llm_metadata_keys=docid_first_node.excluded_llm_metadata_keys,
            )
            self.docstore.add_documents([summary_node_dict[doc_id]])
            logger.info(
                f"> Generated summary for doc {doc_id}: " f"{summary_response.response}"
            )

        for doc_id, nodes in doc_id_to_nodes.items():
            index_struct.add_summary_and_nodes(summary_node_dict[doc_id], nodes)

        if self._embed_summaries:
            summary_nodes = list(summary_node_dict.values())
            id_to_embed_map = embed_nodes(
                summary_nodes, self._embed_model, show_progress=show_progress
            )

            summary_nodes_with_embedding = []
            for node in summary_nodes:
                node_with_embedding = node.model_copy()
                node_with_embedding.embedding = id_to_embed_map[node.node_id]
                summary_nodes_with_embedding.append(node_with_embedding)
            self._vector_store.add(summary_nodes_with_embedding)

    def _build_index_from_nodes(
        self,
        nodes: Sequence[BaseNode],
        **build_kwargs: Any,
    ) -> IndexDocumentSummary:
        """Build index from nodes."""
        # first get doc_id to nodes_dict, generate a summary for each doc_id,
        # then build the index struct
        index_struct = IndexDocumentSummary()
        self._add_nodes_to_index(index_struct, nodes, self._show_progress)
        return index_struct

    def _insert(self, nodes: Sequence[BaseNode], **insert_kwargs: Any) -> None:
        """Insert a document."""
        self._add_nodes_to_index(self._index_struct, nodes)

    def _delete_node(self, node_id: str, **delete_kwargs: Any) -> None:
        pass

    def delete_nodes(
        self,
        node_ids: List[str],
        delete_from_docstore: bool = False,
        **delete_kwargs: Any,
    ) -> None:
        """Delete a list of nodes from the index.

        Args:
            node_ids (List[str]): A list of node_ids from the nodes to delete

        """
        index_nodes = self._index_struct.node_id_to_summary_id.keys()
        for node in node_ids:
            if node not in index_nodes:
                logger.warning(f"node_id {node} not found, will not be deleted.")
                node_ids.remove(node)

        self._index_struct.delete_nodes(node_ids)

        remove_summary_ids = [
            summary_id
            for summary_id in self._index_struct.summary_id_to_node_ids
            if len(self._index_struct.summary_id_to_node_ids[summary_id]) == 0
        ]

        remove_docs = [
            doc_id
            for doc_id in self._index_struct.doc_id_to_summary_id
            if self._index_struct.doc_id_to_summary_id[doc_id] in remove_summary_ids
        ]

        for doc_id in remove_docs:
            self.delete_ref_doc(doc_id)

    def delete_ref_doc(
        self, ref_doc_id: str, delete_from_docstore: bool = False, **delete_kwargs: Any
    ) -> None:
        """Delete a document from the index.
        All nodes in the index related to the document will be deleted.
        """
        ref_doc_info = self.docstore.get_ref_doc_info(ref_doc_id)
        if ref_doc_info is None:
            logger.warning(f"ref_doc_id {ref_doc_id} not found, nothing deleted.")
            return
        self._index_struct.delete(ref_doc_id)
        self._vector_store.delete(ref_doc_id)

        if delete_from_docstore:
            self.docstore.delete_ref_doc(ref_doc_id, raise_error=False)

        self._storage_context.index_store.add_index_struct(self._index_struct)

    @property
    def ref_doc_info(self) -> Dict[str, RefDocInfo]:
        """Retrieve a dict mapping of ingested documents and their nodes+metadata."""
        ref_doc_ids = list(self._index_struct.doc_id_to_summary_id.keys())

        all_ref_doc_info = {}
        for ref_doc_id in ref_doc_ids:
            ref_doc_info = self.docstore.get_ref_doc_info(ref_doc_id)
            if not ref_doc_info:
                continue

            all_ref_doc_info[ref_doc_id] = ref_doc_info
        return all_ref_doc_info

ref_doc_info property

ref_doc_info: Dict[str, RefDocInfo]

Retrieve a dict mapping of ingested documents and their nodes+metadata.

as_retriever

as_retriever(retriever_mode: Union[str, _RetrieverMode] = _RetrieverMode.EMBEDDING, **kwargs: Any) -> BaseRetriever

Get retriever.

Parameters:

Name	Type	Description	Default
retriever_mode	Union[str, DocumentSummaryRetrieverMode]	A retriever mode. Defaults to DocumentSummaryRetrieverMode.EMBEDDING.	EMBEDDING

Source code in llama-index-core/llama_index/core/indices/document_summary/base.py

def as_retriever(
    self,
    retriever_mode: Union[str, _RetrieverMode] = _RetrieverMode.EMBEDDING,
    **kwargs: Any,
) -> BaseRetriever:
    """Get retriever.

    Args:
        retriever_mode (Union[str, DocumentSummaryRetrieverMode]): A retriever mode.
            Defaults to DocumentSummaryRetrieverMode.EMBEDDING.

    """
    from llama_index.core.indices.document_summary.retrievers import (
        DocumentSummaryIndexEmbeddingRetriever,
        DocumentSummaryIndexLLMRetriever,
    )

    LLMRetriever = DocumentSummaryIndexLLMRetriever
    EmbeddingRetriever = DocumentSummaryIndexEmbeddingRetriever

    if retriever_mode == _RetrieverMode.EMBEDDING:
        if not self._embed_summaries:
            raise ValueError(
                "Cannot use embedding retriever if embed_summaries is False"
            )

        return EmbeddingRetriever(
            self,
            object_map=self._object_map,
            embed_model=self._embed_model,
            **kwargs,
        )
    if retriever_mode == _RetrieverMode.LLM:
        return LLMRetriever(
            self, object_map=self._object_map, llm=self._llm, **kwargs
        )
    else:
        raise ValueError(f"Unknown retriever mode: {retriever_mode}")

get_document_summary

get_document_summary(doc_id: str) -> str

Get document summary by doc id.

Parameters:

Name	Type	Description	Default
doc_id	str	A document id.	required

Source code in llama-index-core/llama_index/core/indices/document_summary/base.py

def get_document_summary(self, doc_id: str) -> str:
    """Get document summary by doc id.

    Args:
        doc_id (str): A document id.

    """
    if doc_id not in self._index_struct.doc_id_to_summary_id:
        raise ValueError(f"doc_id {doc_id} not in index")
    summary_id = self._index_struct.doc_id_to_summary_id[doc_id]
    return self.docstore.get_node(summary_id).get_content()

delete_nodes

delete_nodes(node_ids: List[str], delete_from_docstore: bool = False, **delete_kwargs: Any) -> None

Delete a list of nodes from the index.

Parameters:

Name	Type	Description	Default
node_ids	List[str]	A list of node_ids from the nodes to delete	required

Source code in llama-index-core/llama_index/core/indices/document_summary/base.py

def delete_nodes(
    self,
    node_ids: List[str],
    delete_from_docstore: bool = False,
    **delete_kwargs: Any,
) -> None:
    """Delete a list of nodes from the index.

    Args:
        node_ids (List[str]): A list of node_ids from the nodes to delete

    """
    index_nodes = self._index_struct.node_id_to_summary_id.keys()
    for node in node_ids:
        if node not in index_nodes:
            logger.warning(f"node_id {node} not found, will not be deleted.")
            node_ids.remove(node)

    self._index_struct.delete_nodes(node_ids)

    remove_summary_ids = [
        summary_id
        for summary_id in self._index_struct.summary_id_to_node_ids
        if len(self._index_struct.summary_id_to_node_ids[summary_id]) == 0
    ]

    remove_docs = [
        doc_id
        for doc_id in self._index_struct.doc_id_to_summary_id
        if self._index_struct.doc_id_to_summary_id[doc_id] in remove_summary_ids
    ]

    for doc_id in remove_docs:
        self.delete_ref_doc(doc_id)

delete_ref_doc

delete_ref_doc(ref_doc_id: str, delete_from_docstore: bool = False, **delete_kwargs: Any) -> None

Delete a document from the index. All nodes in the index related to the document will be deleted.

Source code in llama-index-core/llama_index/core/indices/document_summary/base.py

def delete_ref_doc(
    self, ref_doc_id: str, delete_from_docstore: bool = False, **delete_kwargs: Any
) -> None:
    """Delete a document from the index.
    All nodes in the index related to the document will be deleted.
    """
    ref_doc_info = self.docstore.get_ref_doc_info(ref_doc_id)
    if ref_doc_info is None:
        logger.warning(f"ref_doc_id {ref_doc_id} not found, nothing deleted.")
        return
    self._index_struct.delete(ref_doc_id)
    self._vector_store.delete(ref_doc_id)

    if delete_from_docstore:
        self.docstore.delete_ref_doc(ref_doc_id, raise_error=False)

    self._storage_context.index_store.add_index_struct(self._index_struct)