Source code for langchain_community.vectorstores.marqo

from __future__ import annotations

import json
import uuid
from typing import (
    TYPE_CHECKING,
    Any,
    Callable,
    Dict,
    Iterable,
    List,
    Optional,
    Tuple,
    Type,
    Union,
)

from langchain_core.documents import Document
from langchain_core.embeddings import Embeddings
from langchain_core.vectorstores import VectorStore

if TYPE_CHECKING:
    import marqo


[docs]class Marqo(VectorStore): """`Marqo` vector store. Marqo indexes have their own models associated with them to generate your embeddings. This means that you can selected from a range of different models and also use CLIP models to create multimodal indexes with images and text together. Marqo also supports more advanced queries with multiple weighted terms, see See https://docs.marqo.ai/latest/#searching-using-weights-in-queries. This class can flexibly take strings or dictionaries for weighted queries in its similarity search methods. To use, you should have the `marqo` python package installed, you can do this with `pip install marqo`. Example: .. code-block:: python import marqo from langchain_community.vectorstores import Marqo client = marqo.Client(url=os.environ["MARQO_URL"], ...) vectorstore = Marqo(client, index_name) """
[docs] def __init__( self, client: marqo.Client, index_name: str, add_documents_settings: Optional[Dict[str, Any]] = None, searchable_attributes: Optional[List[str]] = None, page_content_builder: Optional[Callable[[Dict[str, Any]], str]] = None, ): """Initialize with Marqo client.""" try: import marqo except ImportError: raise ImportError( "Could not import marqo python package. " "Please install it with `pip install marqo`." ) if not isinstance(client, marqo.Client): raise ValueError( f"client should be an instance of marqo.Client, got {type(client)}" ) self._client = client self._index_name = index_name self._add_documents_settings = ( {} if add_documents_settings is None else add_documents_settings ) self._searchable_attributes = searchable_attributes self.page_content_builder = page_content_builder self.tensor_fields = ["text"] self._document_batch_size = 1024
@property def embeddings(self) -> Optional[Embeddings]: return None
[docs] def add_texts( self, texts: Iterable[str], metadatas: Optional[List[dict]] = None, **kwargs: Any, ) -> List[str]: """Upload texts with metadata (properties) to Marqo. You can either have marqo generate ids for each document or you can provide your own by including a "_id" field in the metadata objects. Args: texts (Iterable[str]): am iterator of texts - assumed to preserve an order that matches the metadatas. metadatas (Optional[List[dict]], optional): a list of metadatas. Raises: ValueError: if metadatas is provided and the number of metadatas differs from the number of texts. Returns: List[str]: The list of ids that were added. """ if self._client.index(self._index_name).get_settings()["index_defaults"][ "treat_urls_and_pointers_as_images" ]: raise ValueError( "Marqo.add_texts is disabled for multimodal indexes. To add documents " "with a multimodal index use the Python client for Marqo directly." ) documents: List[Dict[str, str]] = [] num_docs = 0 for i, text in enumerate(texts): doc = { "text": text, "metadata": json.dumps(metadatas[i]) if metadatas else json.dumps({}), } documents.append(doc) num_docs += 1 ids = [] for i in range(0, num_docs, self._document_batch_size): response = self._client.index(self._index_name).add_documents( documents[i : i + self._document_batch_size], tensor_fields=self.tensor_fields, **self._add_documents_settings, ) if response["errors"]: err_msg = ( f"Error in upload for documents in index range [{i}," f"{i + self._document_batch_size}], " f"check Marqo logs." ) raise RuntimeError(err_msg) ids += [item["_id"] for item in response["items"]] return ids
[docs] def similarity_search_with_score( self, query: Union[str, Dict[str, float]], k: int = 4, ) -> List[Tuple[Document, float]]: """Return documents from Marqo that are similar to the query as well as their scores. Args: query (str): The query to search with, either as a string or a weighted query. k (int, optional): The number of documents to return. Defaults to 4. Returns: List[Tuple[Document, float]]: The matching documents and their scores, ordered by descending score. """ results = self.marqo_similarity_search(query=query, k=k) scored_documents = self._construct_documents_from_results_with_score(results) return scored_documents
[docs] def bulk_similarity_search_with_score( self, queries: Iterable[Union[str, Dict[str, float]]], k: int = 4, **kwargs: Any, ) -> List[List[Tuple[Document, float]]]: """Return documents from Marqo that are similar to the query as well as their scores using a batch of queries. Args: query (Iterable[Union[str, Dict[str, float]]]): An iterable of queries to execute in bulk, queries in the list can be strings or dictionaries of weighted queries. k (int, optional): The number of documents to return. Defaults to 4. Returns: List[Tuple[Document, float]]: A list of lists of the matching documents and their scores for each query """ bulk_results = self.marqo_bulk_similarity_search(queries=queries, k=k) bulk_documents: List[List[Tuple[Document, float]]] = [] for results in bulk_results["result"]: documents = self._construct_documents_from_results_with_score(results) bulk_documents.append(documents) return bulk_documents
def _construct_documents_from_results_with_score( self, results: Dict[str, List[Dict[str, str]]] ) -> List[Tuple[Document, Any]]: """Helper to convert Marqo results into documents. Args: results (List[dict]): A marqo results object with the 'hits'. include_scores (bool, optional): Include scores alongside documents. Defaults to False. Returns: Union[List[Document], List[Tuple[Document, float]]]: The documents or document score pairs if `include_scores` is true. """ documents: List[Tuple[Document, Any]] = [] for res in results["hits"]: if self.page_content_builder is None: text = res["text"] else: text = self.page_content_builder(res) metadata = json.loads(res.get("metadata", "{}")) documents.append( (Document(page_content=text, metadata=metadata), res["_score"]) ) return documents def _construct_documents_from_results_without_score( self, results: Dict[str, List[Dict[str, str]]] ) -> List[Document]: """Helper to convert Marqo results into documents. Args: results (List[dict]): A marqo results object with the 'hits'. include_scores (bool, optional): Include scores alongside documents. Defaults to False. Returns: Union[List[Document], List[Tuple[Document, float]]]: The documents or document score pairs if `include_scores` is true. """ documents: List[Document] = [] for res in results["hits"]: if self.page_content_builder is None: text = res["text"] else: text = self.page_content_builder(res) metadata = json.loads(res.get("metadata", "{}")) documents.append(Document(page_content=text, metadata=metadata)) return documents
[docs] @classmethod def from_documents( cls: Type[Marqo], documents: List[Document], embedding: Union[Embeddings, None] = None, **kwargs: Any, ) -> Marqo: """Return VectorStore initialized from documents. Note that Marqo does not need embeddings, we retain the parameter to adhere to the Liskov substitution principle. Args: documents (List[Document]): Input documents embedding (Any, optional): Embeddings (not required). Defaults to None. Returns: VectorStore: A Marqo vectorstore """ texts = [d.page_content for d in documents] metadatas = [d.metadata for d in documents] return cls.from_texts(texts, metadatas=metadatas, **kwargs)
[docs] @classmethod def from_texts( cls, texts: List[str], embedding: Any = None, metadatas: Optional[List[dict]] = None, index_name: str = "", url: str = "http://localhost:8882", api_key: str = "", add_documents_settings: Optional[Dict[str, Any]] = None, searchable_attributes: Optional[List[str]] = None, page_content_builder: Optional[Callable[[Dict[str, str]], str]] = None, index_settings: Optional[Dict[str, Any]] = None, verbose: bool = True, **kwargs: Any, ) -> Marqo: """Return Marqo initialized from texts. Note that Marqo does not need embeddings, we retain the parameter to adhere to the Liskov substitution principle. This is a quick way to get started with marqo - simply provide your texts and metadatas and this will create an instance of the data store and index the provided data. To know the ids of your documents with this approach you will need to include them in under the key "_id" in your metadatas for each text Example: .. code-block:: python from langchain_community.vectorstores import Marqo datastore = Marqo(texts=['text'], index_name='my-first-index', url='http://localhost:8882') Args: texts (List[str]): A list of texts to index into marqo upon creation. embedding (Any, optional): Embeddings (not required). Defaults to None. index_name (str, optional): The name of the index to use, if none is provided then one will be created with a UUID. Defaults to None. url (str, optional): The URL for Marqo. Defaults to "http://localhost:8882". api_key (str, optional): The API key for Marqo. Defaults to "". metadatas (Optional[List[dict]], optional): A list of metadatas, to accompany the texts. Defaults to None. this is only used when a new index is being created. Defaults to "cpu". Can be "cpu" or "cuda". add_documents_settings (Optional[Dict[str, Any]], optional): Settings for adding documents, see https://docs.marqo.ai/0.0.16/API-Reference/documents/#query-parameters. Defaults to {}. index_settings (Optional[Dict[str, Any]], optional): Index settings if the index doesn't exist, see https://docs.marqo.ai/0.0.16/API-Reference/indexes/#index-defaults-object. Defaults to {}. Returns: Marqo: An instance of the Marqo vector store """ try: import marqo except ImportError: raise ImportError( "Could not import marqo python package. " "Please install it with `pip install marqo`." ) if not index_name: index_name = str(uuid.uuid4()) client = marqo.Client(url=url, api_key=api_key) try: client.create_index(index_name, settings_dict=index_settings or {}) if verbose: print(f"Created {index_name} successfully.") # noqa: T201 except Exception: if verbose: print(f"Index {index_name} exists.") # noqa: T201 instance: Marqo = cls( client, index_name, searchable_attributes=searchable_attributes, add_documents_settings=add_documents_settings or {}, page_content_builder=page_content_builder, ) instance.add_texts(texts, metadatas) return instance
[docs] def get_indexes(self) -> List[Dict[str, str]]: """Helper to see your available indexes in marqo, useful if the from_texts method was used without an index name specified Returns: List[Dict[str, str]]: The list of indexes """ return self._client.get_indexes()["results"]
[docs] def get_number_of_documents(self) -> int: """Helper to see the number of documents in the index Returns: int: The number of documents """ return self._client.index(self._index_name).get_stats()["numberOfDocuments"]