`langchain_community.vectorstores.astradb`.AstraDB¶

class langchain_community.vectorstores.astradb.AstraDB(*, embedding: Embeddings, collection_name: str, token: Optional[str] = None, api_endpoint: Optional[str] = None, astra_db_client: Optional[LibAstraDB] = None, async_astra_db_client: Optional[AsyncAstraDB] = None, namespace: Optional[str] = None, metric: Optional[str] = None, batch_size: Optional[int] = None, bulk_insert_batch_concurrency: Optional[int] = None, bulk_insert_overwrite_concurrency: Optional[int] = None, bulk_delete_concurrency: Optional[int] = None, setup_mode: SetupMode = SetupMode.SYNC, pre_delete_collection: bool = False)[source]¶

Deprecated since version 0.0.21: Use langchain_astradb.AstraDBVectorStore instead.

Wrapper around DataStax Astra DB for vector-store workloads.

For quickstart and details, visit https://docs.datastax.com/en/astra/astra-db-vector/

Example

from langchain_community.vectorstores import AstraDB
from langchain_openai.embeddings import OpenAIEmbeddings

embeddings = OpenAIEmbeddings()
vectorstore = AstraDB(
    embedding=embeddings,
    collection_name="my_store",
    token="AstraCS:...",
    api_endpoint="https://<DB-ID>-<REGION>.apps.astra.datastax.com"
)

vectorstore.add_texts(["Giraffes", "All good here"])
results = vectorstore.similarity_search("Everything's ok", k=1)

Parameters

embedding (Embeddings) – embedding function to use.
collection_name (str) – name of the Astra DB collection to create/use.
token (Optional[str]) – API token for Astra DB usage.
api_endpoint (Optional[str]) – full URL to the API endpoint, such as https://<DB-ID>-us-east1.apps.astra.datastax.com.
astra_db_client (Optional[LibAstraDB]) – alternative to token+api_endpoint, you can pass an already-created ‘astrapy.db.AstraDB’ instance.
async_astra_db_client (Optional[AsyncAstraDB]) – alternative to token+api_endpoint, you can pass an already-created ‘astrapy.db.AsyncAstraDB’ instance.
namespace (Optional[str]) – namespace (aka keyspace) where the collection is created. Defaults to the database’s “default namespace”.
metric (Optional[str]) – similarity function to use out of those available in Astra DB. If left out, it will use Astra DB API’s defaults (i.e. “cosine” - but, for performance reasons, “dot_product” is suggested if embeddings are normalized to one).
batch_size (Optional[int]) – Size of batches for bulk insertions.
bulk_insert_batch_concurrency (Optional[int]) – Number of threads or coroutines to insert batches concurrently.
bulk_insert_overwrite_concurrency (Optional[int]) – Number of threads or coroutines in a batch to insert pre-existing entries.
bulk_delete_concurrency (Optional[int]) – Number of threads (for deleting multiple rows concurrently).
pre_delete_collection (bool) – whether to delete the collection before creating it. If False and the collection already exists, the collection will be used as is.
setup_mode (SetupMode) –

Note

For concurrency in synchronous add_texts():, as a rule of thumb, on a typical client machine it is suggested to keep the quantity bulk_insert_batch_concurrency * bulk_insert_overwrite_concurrency much below 1000 to avoid exhausting the client multithreading/networking resources. The hardcoded defaults are somewhat conservative to meet most machines’ specs, but a sensible choice to test may be:

bulk_insert_batch_concurrency = 80
bulk_insert_overwrite_concurrency = 10

A bit of experimentation is required to nail the best results here, depending on both the machine/network specs and the expected workload (specifically, how often a write is an update of an existing id). Remember you can pass concurrency settings to individual calls to add_texts() and add_documents() as well.

Attributes

embeddings

Access the query embedding object if available.

Methods

`__init__`(*, embedding, collection_name[, ...])	Wrapper around DataStax Astra DB for vector-store workloads.
`aadd_documents`(documents, **kwargs)	Async run more documents through the embeddings and add to the vectorstore.
`aadd_texts`(texts[, metadatas, ids, ...])	Run texts through the embeddings and add them to the vectorstore.
`aclear`()	Empty the collection of all its stored entries.
`add_documents`(documents, **kwargs)	Add or update documents in the vectorstore.
`add_texts`(texts[, metadatas, ids, ...])	Run texts through the embeddings and add them to the vectorstore.
`adelete`([ids, concurrency])	Delete by vector ids.
`adelete_by_document_id`(document_id)	Remove a single document from the store, given its document ID.
`adelete_collection`()	Completely delete the collection from the database (as opposed to `aclear()`, which empties it only).
`afrom_documents`(documents, embedding, **kwargs)	Async return VectorStore initialized from documents and embeddings.
`afrom_texts`(texts, embedding[, metadatas, ids])	Create an Astra DB vectorstore from raw texts.
`aget_by_ids`(ids, /)	Async get documents by their IDs.
`amax_marginal_relevance_search`(query[, k, ...])	Return docs selected using the maximal marginal relevance.
`amax_marginal_relevance_search_by_vector`(...)	Return docs selected using the maximal marginal relevance.
`as_retriever`(**kwargs)	Return VectorStoreRetriever initialized from this VectorStore.
`asearch`(query, search_type, **kwargs)	Async return docs most similar to query using a specified search type.
`asimilarity_search`(query[, k, filter])	Return docs most similar to query.
`asimilarity_search_by_vector`(embedding[, k, ...])	Return docs most similar to embedding vector.
`asimilarity_search_with_relevance_scores`(query)	Async return docs and relevance scores in the range [0, 1].
`asimilarity_search_with_score`(query[, k, filter])	Return docs most similar to query with score.
`asimilarity_search_with_score_by_vector`(...)	Return docs most similar to embedding vector with score.
`asimilarity_search_with_score_id`(query[, k, ...])	Return docs most similar to the query with score and id.
`asimilarity_search_with_score_id_by_vector`(...)	Return docs most similar to embedding vector with score and id.
`astreaming_upsert`(items, /, batch_size, **kwargs)
`aupsert`(items, /, **kwargs)
`clear`()	Empty the collection of all its stored entries.
`delete`([ids, concurrency])	Delete by vector ids.
`delete_by_document_id`(document_id)	Remove a single document from the store, given its document ID.
`delete_collection`()	Completely delete the collection from the database (as opposed to `clear()`, which empties it only).
`from_documents`(documents, embedding, **kwargs)	Create an Astra DB vectorstore from a document list.
`from_texts`(texts, embedding[, metadatas, ids])	Create an Astra DB vectorstore from raw texts.
`get_by_ids`(ids, /)	Get documents by their IDs.
`max_marginal_relevance_search`(query[, k, ...])	Return docs selected using the maximal marginal relevance.
`max_marginal_relevance_search_by_vector`(...)	Return docs selected using the maximal marginal relevance.
`search`(query, search_type, **kwargs)	Return docs most similar to query using a specified search type.
`similarity_search`(query[, k, filter])	Return docs most similar to query.
`similarity_search_by_vector`(embedding[, k, ...])	Return docs most similar to embedding vector.
`similarity_search_with_relevance_scores`(query)	Return docs and relevance scores in the range [0, 1].
`similarity_search_with_score`(query[, k, filter])	Return docs most similar to query with score.
`similarity_search_with_score_by_vector`(embedding)	Return docs most similar to embedding vector with score.
`similarity_search_with_score_id`(query[, k, ...])	Return docs most similar to the query with score and id.
`similarity_search_with_score_id_by_vector`(...)	Return docs most similar to embedding vector with score and id.
`streaming_upsert`(items, /, batch_size, **kwargs)
`upsert`(items, /, **kwargs)

__init__(*, embedding: Embeddings, collection_name: str, token: Optional[str] = None, api_endpoint: Optional[str] = None, astra_db_client: Optional[LibAstraDB] = None, async_astra_db_client: Optional[AsyncAstraDB] = None, namespace: Optional[str] = None, metric: Optional[str] = None, batch_size: Optional[int] = None, bulk_insert_batch_concurrency: Optional[int] = None, bulk_insert_overwrite_concurrency: Optional[int] = None, bulk_delete_concurrency: Optional[int] = None, setup_mode: SetupMode = SetupMode.SYNC, pre_delete_collection: bool = False) → None[source]¶

Wrapper around DataStax Astra DB for vector-store workloads.

For quickstart and details, visit https://docs.datastax.com/en/astra/astra-db-vector/

Example

from langchain_community.vectorstores import AstraDB
from langchain_openai.embeddings import OpenAIEmbeddings

embeddings = OpenAIEmbeddings()
vectorstore = AstraDB(
    embedding=embeddings,
    collection_name="my_store",
    token="AstraCS:...",
    api_endpoint="https://<DB-ID>-<REGION>.apps.astra.datastax.com"
)

vectorstore.add_texts(["Giraffes", "All good here"])
results = vectorstore.similarity_search("Everything's ok", k=1)

Parameters

embedding (Embeddings) – embedding function to use.
collection_name (str) – name of the Astra DB collection to create/use.
token (Optional[str]) – API token for Astra DB usage.
api_endpoint (Optional[str]) – full URL to the API endpoint, such as https://<DB-ID>-us-east1.apps.astra.datastax.com.
astra_db_client (Optional[LibAstraDB]) – alternative to token+api_endpoint, you can pass an already-created ‘astrapy.db.AstraDB’ instance.
async_astra_db_client (Optional[AsyncAstraDB]) – alternative to token+api_endpoint, you can pass an already-created ‘astrapy.db.AsyncAstraDB’ instance.
namespace (Optional[str]) – namespace (aka keyspace) where the collection is created. Defaults to the database’s “default namespace”.
metric (Optional[str]) – similarity function to use out of those available in Astra DB. If left out, it will use Astra DB API’s defaults (i.e. “cosine” - but, for performance reasons, “dot_product” is suggested if embeddings are normalized to one).
batch_size (Optional[int]) – Size of batches for bulk insertions.
bulk_insert_batch_concurrency (Optional[int]) – Number of threads or coroutines to insert batches concurrently.
bulk_insert_overwrite_concurrency (Optional[int]) – Number of threads or coroutines in a batch to insert pre-existing entries.
bulk_delete_concurrency (Optional[int]) – Number of threads (for deleting multiple rows concurrently).
pre_delete_collection (bool) – whether to delete the collection before creating it. If False and the collection already exists, the collection will be used as is.
setup_mode (SetupMode) –

Return type

None

Note

For concurrency in synchronous add_texts():, as a rule of thumb, on a typical client machine it is suggested to keep the quantity bulk_insert_batch_concurrency * bulk_insert_overwrite_concurrency much below 1000 to avoid exhausting the client multithreading/networking resources. The hardcoded defaults are somewhat conservative to meet most machines’ specs, but a sensible choice to test may be:

bulk_insert_batch_concurrency = 80
bulk_insert_overwrite_concurrency = 10

A bit of experimentation is required to nail the best results here, depending on both the machine/network specs and the expected workload (specifically, how often a write is an update of an existing id). Remember you can pass concurrency settings to individual calls to add_texts() and add_documents() as well.

async aadd_documents(documents: List[Document], **kwargs: Any) → List[str]¶

Async run more documents through the embeddings and add to the vectorstore.

Parameters

documents (List[Document]) – Documents to add to the vectorstore.
kwargs (Any) – Additional keyword arguments.

Returns

List of IDs of the added texts.

Raises

ValueError – If the number of IDs does not match the number of documents.

Return type

List[str]

async aadd_texts(texts: Iterable[str], metadatas: Optional[List[dict]] = None, ids: Optional[List[str]] = None, *, batch_size: Optional[int] = None, batch_concurrency: Optional[int] = None, overwrite_concurrency: Optional[int] = None, **kwargs: Any) → List[str][source]¶

Run texts through the embeddings and add them to the vectorstore.

If passing explicit ids, those entries whose id is in the store already will be replaced.

Parameters

texts (Iterable[str]) – Texts to add to the vectorstore.
metadatas (Optional[List[dict]]) – Optional list of metadatas.
ids (Optional[List[str]]) – Optional list of ids.
batch_size (Optional[int]) – Number of documents in each API call. Check the underlying Astra DB HTTP API specs for the max value (20 at the time of writing this). If not provided, defaults to the instance-level setting.
batch_concurrency (Optional[int]) – number of threads to process insertion batches concurrently. Defaults to instance-level setting if not provided.
overwrite_concurrency (Optional[int]) – number of threads to process pre-existing documents in each batch (which require individual API calls). Defaults to instance-level setting if not provided.
kwargs (Any) –

Return type

List[str]

Note

There are constraints on the allowed field names in the metadata dictionaries, coming from the underlying Astra DB API. For instance, the $ (dollar sign) cannot be used in the dict keys. See this document for details: https://docs.datastax.com/en/astra/astra-db-vector/api-reference/data-api.html

Returns

The list of ids of the added texts.

Parameters

texts (Iterable[str]) –
metadatas (Optional[List[dict]]) –
ids (Optional[List[str]]) –
batch_size (Optional[int]) –
batch_concurrency (Optional[int]) –
overwrite_concurrency (Optional[int]) –
kwargs (Any) –

Return type

List[str]

async aclear() → None[source]¶

Empty the collection of all its stored entries.

Return type: None

add_documents(documents: List[Document], **kwargs: Any) → List[str]¶

Add or update documents in the vectorstore.

Parameters

documents (List[Document]) – Documents to add to the vectorstore.
kwargs (Any) – Additional keyword arguments. if kwargs contains ids and documents contain ids, the ids in the kwargs will receive precedence.

Returns

List of IDs of the added texts.

Raises

ValueError – If the number of ids does not match the number of documents.

Return type

List[str]

add_texts(texts: Iterable[str], metadatas: Optional[List[dict]] = None, ids: Optional[List[str]] = None, *, batch_size: Optional[int] = None, batch_concurrency: Optional[int] = None, overwrite_concurrency: Optional[int] = None, **kwargs: Any) → List[str][source]¶

Run texts through the embeddings and add them to the vectorstore.

If passing explicit ids, those entries whose id is in the store already will be replaced.

Parameters

texts (Iterable[str]) – Texts to add to the vectorstore.
metadatas (Optional[List[dict]]) – Optional list of metadatas.
ids (Optional[List[str]]) – Optional list of ids.
batch_size (Optional[int]) – Number of documents in each API call. Check the underlying Astra DB HTTP API specs for the max value (20 at the time of writing this). If not provided, defaults to the instance-level setting.
batch_concurrency (Optional[int]) – number of threads to process insertion batches concurrently. Defaults to instance-level setting if not provided.
overwrite_concurrency (Optional[int]) – number of threads to process pre-existing documents in each batch (which require individual API calls). Defaults to instance-level setting if not provided.
kwargs (Any) –

Return type

List[str]

Note

There are constraints on the allowed field names in the metadata dictionaries, coming from the underlying Astra DB API. For instance, the $ (dollar sign) cannot be used in the dict keys. See this document for details: https://docs.datastax.com/en/astra/astra-db-vector/api-reference/data-api.html

Returns

The list of ids of the added texts.

Parameters

texts (Iterable[str]) –
metadatas (Optional[List[dict]]) –
ids (Optional[List[str]]) –
batch_size (Optional[int]) –
batch_concurrency (Optional[int]) –
overwrite_concurrency (Optional[int]) –
kwargs (Any) –

Return type

List[str]

async adelete(ids: Optional[List[str]] = None, concurrency: Optional[int] = None, **kwargs: Any) → Optional[bool][source]¶

Delete by vector ids.

Parameters

ids (Optional[List[str]]) – List of ids to delete.
concurrency (Optional[int]) – max concurrency of single-doc delete requests. Defaults to instance-level setting.
**kwargs (Any) – Other keyword arguments that subclasses might use.

Returns

True if deletion is successful, False otherwise.

Return type

Optional[bool]

async adelete_by_document_id(document_id: str) → bool[source]¶

Remove a single document from the store, given its document ID.

Parameters: document_id (str) – The document ID
Return type: bool

Returns: True if a document has indeed been deleted, False if ID not found.

async adelete_collection() → None[source]¶

Completely delete the collection from the database (as opposed to aclear(), which empties it only). Stored data is lost and unrecoverable, resources are freed. Use with caution.

Return type: None

async classmethod afrom_documents(documents: List[Document], embedding: Embeddings, **kwargs: Any) → VST¶

Async return VectorStore initialized from documents and embeddings.

Parameters

documents (List[Document]) – List of Documents to add to the vectorstore.
embedding (Embeddings) – Embedding function to use.
kwargs (Any) – Additional keyword arguments.

Returns

VectorStore initialized from documents and embeddings.

Return type

VectorStore

async classmethod afrom_texts(texts: List[str], embedding: Embeddings, metadatas: Optional[List[dict]] = None, ids: Optional[List[str]] = None, **kwargs: Any) → ADBVST[source]¶

Create an Astra DB vectorstore from raw texts.

Parameters

texts (List[str]) – the texts to insert.
embedding (Embeddings) – the embedding function to use in the store.
metadatas (Optional[List[dict]]) – metadata dicts for the texts.
ids (Optional[List[str]]) – ids to associate to the texts.
**kwargs (Any) – you can pass any argument that you would to add_texts() and/or to the ‘AstraDB’ constructor (see these methods for details). These arguments will be routed to the respective methods as they are.

Returns

an AstraDb vectorstore.

Return type

ADBVST

async aget_by_ids(ids: Sequence[str], /) → List[Document]¶

Async get documents by their IDs.

The returned documents are expected to have the ID field set to the ID of the document in the vector store.

Fewer documents may be returned than requested if some IDs are not found or if there are duplicated IDs.

Users should not assume that the order of the returned documents matches the order of the input IDs. Instead, users should rely on the ID field of the returned documents.

This method should NOT raise exceptions if no documents are found for some IDs.

Parameters: ids (Sequence[str]) – List of ids to retrieve.
Returns: List of Documents.
Return type: List[Document]

New in version 0.2.11.

async amax_marginal_relevance_search(query: str, k: int = 4, fetch_k: int = 20, lambda_mult: float = 0.5, filter: Optional[Dict[str, Any]] = None, **kwargs: Any) → List[Document][source]¶

Return docs selected using the maximal marginal relevance.

Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.

Parameters

query (str) – Query to look up documents similar to.
k (int) – Number of Documents to return.
fetch_k (int) – Number of Documents to fetch to pass to MMR algorithm.
lambda_mult (float) – Number between 0 and 1 that determines the degree of diversity among the results with 0 corresponding to maximum diversity and 1 to minimum diversity.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.
kwargs (Any) –

Returns

The list of Documents selected by maximal marginal relevance.

Return type

List[Document]

async amax_marginal_relevance_search_by_vector(embedding: List[float], k: int = 4, fetch_k: int = 20, lambda_mult: float = 0.5, filter: Optional[Dict[str, Any]] = None, **kwargs: Any) → List[Document][source]¶

Return docs selected using the maximal marginal relevance.

Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.

Parameters

embedding (List[float]) – Embedding to look up documents similar to.
k (int) – Number of Documents to return.
fetch_k (int) – Number of Documents to fetch to pass to MMR algorithm.
lambda_mult (float) – Number between 0 and 1 that determines the degree of diversity among the results with 0 corresponding to maximum diversity and 1 to minimum diversity.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.
kwargs (Any) –

Returns

The list of Documents selected by maximal marginal relevance.

Return type

List[Document]

as_retriever(**kwargs: Any) → VectorStoreRetriever¶

Return VectorStoreRetriever initialized from this VectorStore.

Parameters

**kwargs (Any) –

Keyword arguments to pass to the search function. Can include: search_type (Optional[str]): Defines the type of search that

the Retriever should perform. Can be “similarity” (default), “mmr”, or “similarity_score_threshold”.

search_kwargs (Optional[Dict]): Keyword arguments to pass to the

search function. Can include things like:

k: Amount of documents to return (Default: 4) score_threshold: Minimum relevance threshold

for similarity_score_threshold

fetch_k: Amount of documents to pass to MMR algorithm: (Default: 20)
lambda_mult: Diversity of results returned by MMR;: 1 for minimum diversity and 0 for maximum. (Default: 0.5)

filter: Filter by document metadata

Returns

Retriever class for VectorStore.

Return type

VectorStoreRetriever

Examples:

# Retrieve more documents with higher diversity
# Useful if your dataset has many similar documents
docsearch.as_retriever(
    search_type="mmr",
    search_kwargs={'k': 6, 'lambda_mult': 0.25}
)

# Fetch more documents for the MMR algorithm to consider
# But only return the top 5
docsearch.as_retriever(
    search_type="mmr",
    search_kwargs={'k': 5, 'fetch_k': 50}
)

# Only retrieve documents that have a relevance score
# Above a certain threshold
docsearch.as_retriever(
    search_type="similarity_score_threshold",
    search_kwargs={'score_threshold': 0.8}
)

# Only get the single most similar document from the dataset
docsearch.as_retriever(search_kwargs={'k': 1})

# Use a filter to only retrieve documents from a specific paper
docsearch.as_retriever(
    search_kwargs={'filter': {'paper_title':'GPT-4 Technical Report'}}
)

async asearch(query: str, search_type: str, **kwargs: Any) → List[Document]¶

Async return docs most similar to query using a specified search type.

Parameters

query (str) – Input text.
search_type (str) – Type of search to perform. Can be “similarity”, “mmr”, or “similarity_score_threshold”.
**kwargs (Any) – Arguments to pass to the search method.

Returns

List of Documents most similar to the query.

Raises

ValueError – If search_type is not one of “similarity”, “mmr”, or “similarity_score_threshold”.

Return type

List[Document]

async asimilarity_search(query: str, k: int = 4, filter: Optional[Dict[str, Any]] = None, **kwargs: Any) → List[Document][source]¶

Return docs most similar to query.

Parameters

query (str) – Query to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.
kwargs (Any) –

Returns

The list of Documents most similar to the query.

Return type

List[Document]

async asimilarity_search_by_vector(embedding: List[float], k: int = 4, filter: Optional[Dict[str, Any]] = None, **kwargs: Any) → List[Document][source]¶

Return docs most similar to embedding vector.

Parameters

embedding (List[float]) – Embedding to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.
kwargs (Any) –

Returns

The list of Documents most similar to the query vector.

Return type

List[Document]

async asimilarity_search_with_relevance_scores(query: str, k: int = 4, **kwargs: Any) → List[Tuple[Document, float]]¶

Async return docs and relevance scores in the range [0, 1].

0 is dissimilar, 1 is most similar.

Parameters

query (str) – Input text.
k (int) – Number of Documents to return. Defaults to 4.
**kwargs (Any) –
kwargs to be passed to similarity search. Should include: score_threshold: Optional, a floating point value between 0 to 1 to

filter the resulting set of retrieved docs

Returns

List of Tuples of (doc, similarity_score)

Return type

List[Tuple[Document, float]]

async asimilarity_search_with_score(query: str, k: int = 4, filter: Optional[Dict[str, Any]] = None) → List[Tuple[Document, float]][source]¶

Return docs most similar to query with score.

Parameters

query (str) – Query to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.

Returns

The list of (Document, score), the most similar to the query vector.

Return type

List[Tuple[Document, float]]

async asimilarity_search_with_score_by_vector(embedding: List[float], k: int = 4, filter: Optional[Dict[str, Any]] = None) → List[Tuple[Document, float]][source]¶

Return docs most similar to embedding vector with score.

Parameters

embedding (List[float]) – Embedding to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.

Returns

The list of (Document, score), the most similar to the query vector.

Return type

List[Tuple[Document, float]]

async asimilarity_search_with_score_id(query: str, k: int = 4, filter: Optional[Dict[str, Any]] = None) → List[Tuple[Document, float, str]][source]¶

Return docs most similar to the query with score and id.

Parameters

query (str) – Query to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.

Returns

The list of (Document, score, id), the most similar to the query.

Return type

List[Tuple[Document, float, str]]

async asimilarity_search_with_score_id_by_vector(embedding: List[float], k: int = 4, filter: Optional[Dict[str, Any]] = None) → List[Tuple[Document, float, str]][source]¶

Return docs most similar to embedding vector with score and id.

Parameters

embedding (List[float]) – Embedding to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.

Returns

The list of (Document, score, id), the most similar to the query vector.

Return type

List[Tuple[Document, float, str]]

astreaming_upsert(items: AsyncIterable[Document], /, batch_size: int, **kwargs: Any) → AsyncIterator[UpsertResponse]¶

Beta

Added in 0.2.11. The API is subject to change.

Upsert documents in a streaming fashion. Async version of streaming_upsert.

Parameters

items (AsyncIterable[Document]) – Iterable of Documents to add to the vectorstore.
batch_size (int) – The size of each batch to upsert.
kwargs (Any) – Additional keyword arguments. kwargs should only include parameters that are common to all documents. (e.g., timeout for indexing, retry policy, etc.) kwargs should not include ids to avoid ambiguous semantics. Instead the ID should be provided as part of the Document object.

Yields

UpsertResponse – A response object that contains the list of IDs that were successfully added or updated in the vectorstore and the list of IDs that failed to be added or updated.

Return type

AsyncIterator[UpsertResponse]

New in version 0.2.11.

async aupsert(items: Sequence[Document], /, **kwargs: Any) → UpsertResponse¶

Beta

Added in 0.2.11. The API is subject to change.

Add or update documents in the vectorstore. Async version of upsert.

The upsert functionality should utilize the ID field of the Document object if it is provided. If the ID is not provided, the upsert method is free to generate an ID for the document.

When an ID is specified and the document already exists in the vectorstore, the upsert method should update the document with the new data. If the document does not exist, the upsert method should add the document to the vectorstore.

Parameters

items (Sequence[Document]) – Sequence of Documents to add to the vectorstore.
kwargs (Any) – Additional keyword arguments.

Returns

A response object that contains the list of IDs that were successfully added or updated in the vectorstore and the list of IDs that failed to be added or updated.

Return type

UpsertResponse

New in version 0.2.11.

clear() → None[source]¶

Empty the collection of all its stored entries.

Return type: None

delete(ids: Optional[List[str]] = None, concurrency: Optional[int] = None, **kwargs: Any) → Optional[bool][source]¶

Delete by vector ids.

Parameters

ids (Optional[List[str]]) – List of ids to delete.
concurrency (Optional[int]) – max number of threads issuing single-doc delete requests. Defaults to instance-level setting.
kwargs (Any) –

Returns

True if deletion is successful, False otherwise.

Return type

Optional[bool]

delete_by_document_id(document_id: str) → bool[source]¶

Remove a single document from the store, given its document ID.

Parameters: document_id (str) – The document ID
Return type: bool

Returns: True if a document has indeed been deleted, False if ID not found.

delete_collection() → None[source]¶

Completely delete the collection from the database (as opposed to clear(), which empties it only). Stored data is lost and unrecoverable, resources are freed. Use with caution.

Return type: None

classmethod from_documents(documents: List[Document], embedding: Embeddings, **kwargs: Any) → ADBVST[source]¶

Create an Astra DB vectorstore from a document list.

Utility method that defers to ‘from_texts’ (see that one).

Args: see ‘from_texts’, except here you have to supply ‘documents’: in place of ‘texts’ and ‘metadatas’.

Returns

an AstraDB vectorstore.

Parameters

documents (List[Document]) –
embedding (Embeddings) –
kwargs (Any) –

Return type

ADBVST

classmethod from_texts(texts: List[str], embedding: Embeddings, metadatas: Optional[List[dict]] = None, ids: Optional[List[str]] = None, **kwargs: Any) → ADBVST[source]¶

Create an Astra DB vectorstore from raw texts.

Parameters

texts (List[str]) – the texts to insert.
embedding (Embeddings) – the embedding function to use in the store.
metadatas (Optional[List[dict]]) – metadata dicts for the texts.
ids (Optional[List[str]]) – ids to associate to the texts.
**kwargs (Any) – you can pass any argument that you would to add_texts() and/or to the ‘AstraDB’ constructor (see these methods for details). These arguments will be routed to the respective methods as they are.

Returns

an AstraDb vectorstore.

Return type

ADBVST

get_by_ids(ids: Sequence[str], /) → List[Document]¶

Get documents by their IDs.

The returned documents are expected to have the ID field set to the ID of the document in the vector store.

Fewer documents may be returned than requested if some IDs are not found or if there are duplicated IDs.

Users should not assume that the order of the returned documents matches the order of the input IDs. Instead, users should rely on the ID field of the returned documents.

This method should NOT raise exceptions if no documents are found for some IDs.

Parameters: ids (Sequence[str]) – List of ids to retrieve.
Returns: List of Documents.
Return type: List[Document]

New in version 0.2.11.

max_marginal_relevance_search(query: str, k: int = 4, fetch_k: int = 20, lambda_mult: float = 0.5, filter: Optional[Dict[str, Any]] = None, **kwargs: Any) → List[Document][source]¶

Return docs selected using the maximal marginal relevance.

Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.

Parameters

query (str) – Query to look up documents similar to.
k (int) – Number of Documents to return.
fetch_k (int) – Number of Documents to fetch to pass to MMR algorithm.
lambda_mult (float) – Number between 0 and 1 that determines the degree of diversity among the results with 0 corresponding to maximum diversity and 1 to minimum diversity.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.
kwargs (Any) –

Returns

The list of Documents selected by maximal marginal relevance.

Return type

List[Document]

max_marginal_relevance_search_by_vector(embedding: List[float], k: int = 4, fetch_k: int = 20, lambda_mult: float = 0.5, filter: Optional[Dict[str, Any]] = None, **kwargs: Any) → List[Document][source]¶

Return docs selected using the maximal marginal relevance.

Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.

Parameters

embedding (List[float]) – Embedding to look up documents similar to.
k (int) – Number of Documents to return.
fetch_k (int) – Number of Documents to fetch to pass to MMR algorithm.
lambda_mult (float) – Number between 0 and 1 that determines the degree of diversity among the results with 0 corresponding to maximum diversity and 1 to minimum diversity.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.
kwargs (Any) –

Returns

The list of Documents selected by maximal marginal relevance.

Return type

List[Document]

search(query: str, search_type: str, **kwargs: Any) → List[Document]¶

Return docs most similar to query using a specified search type.

Parameters

query (str) – Input text
search_type (str) – Type of search to perform. Can be “similarity”, “mmr”, or “similarity_score_threshold”.
**kwargs (Any) – Arguments to pass to the search method.

Returns

List of Documents most similar to the query.

Raises

ValueError – If search_type is not one of “similarity”, “mmr”, or “similarity_score_threshold”.

Return type

List[Document]

similarity_search(query: str, k: int = 4, filter: Optional[Dict[str, Any]] = None, **kwargs: Any) → List[Document][source]¶

Return docs most similar to query.

Parameters

query (str) – Query to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.
kwargs (Any) –

Returns

The list of Documents most similar to the query.

Return type

List[Document]

similarity_search_by_vector(embedding: List[float], k: int = 4, filter: Optional[Dict[str, Any]] = None, **kwargs: Any) → List[Document][source]¶

Return docs most similar to embedding vector.

Parameters

embedding (List[float]) – Embedding to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.
kwargs (Any) –

Returns

The list of Documents most similar to the query vector.

Return type

List[Document]

similarity_search_with_relevance_scores(query: str, k: int = 4, **kwargs: Any) → List[Tuple[Document, float]]¶

Return docs and relevance scores in the range [0, 1].

0 is dissimilar, 1 is most similar.

Parameters

query (str) – Input text.
k (int) – Number of Documents to return. Defaults to 4.
**kwargs (Any) –
kwargs to be passed to similarity search. Should include: score_threshold: Optional, a floating point value between 0 to 1 to

filter the resulting set of retrieved docs.

Returns

List of Tuples of (doc, similarity_score).

Return type

List[Tuple[Document, float]]

similarity_search_with_score(query: str, k: int = 4, filter: Optional[Dict[str, Any]] = None) → List[Tuple[Document, float]][source]¶

Return docs most similar to query with score.

Parameters

query (str) – Query to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.

Returns

The list of (Document, score), the most similar to the query vector.

Return type

List[Tuple[Document, float]]

similarity_search_with_score_by_vector(embedding: List[float], k: int = 4, filter: Optional[Dict[str, Any]] = None) → List[Tuple[Document, float]][source]¶

Return docs most similar to embedding vector with score.

Parameters

embedding (List[float]) – Embedding to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.

Returns

The list of (Document, score), the most similar to the query vector.

Return type

List[Tuple[Document, float]]

similarity_search_with_score_id(query: str, k: int = 4, filter: Optional[Dict[str, Any]] = None) → List[Tuple[Document, float, str]][source]¶

Return docs most similar to the query with score and id.

Parameters

query (str) – Query to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.

Returns

The list of (Document, score, id), the most similar to the query.

Return type

List[Tuple[Document, float, str]]

similarity_search_with_score_id_by_vector(embedding: List[float], k: int = 4, filter: Optional[Dict[str, Any]] = None) → List[Tuple[Document, float, str]][source]¶

Return docs most similar to embedding vector with score and id.

Parameters

embedding (List[float]) – Embedding to look up documents similar to.
k (int) – Number of Documents to return. Defaults to 4.
filter (Optional[Dict[str, Any]]) – Filter on the metadata to apply.

Returns

The list of (Document, score, id), the most similar to the query vector.

Return type

List[Tuple[Document, float, str]]

streaming_upsert(items: Iterable[Document], /, batch_size: int, **kwargs: Any) → Iterator[UpsertResponse]¶

Beta

Added in 0.2.11. The API is subject to change.

Upsert documents in a streaming fashion.

Parameters

items (Iterable[Document]) – Iterable of Documents to add to the vectorstore.
batch_size (int) – The size of each batch to upsert.
kwargs (Any) – Additional keyword arguments. kwargs should only include parameters that are common to all documents. (e.g., timeout for indexing, retry policy, etc.) kwargs should not include ids to avoid ambiguous semantics. Instead, the ID should be provided as part of the Document object.

Yields

UpsertResponse – A response object that contains the list of IDs that were successfully added or updated in the vectorstore and the list of IDs that failed to be added or updated.

Return type

Iterator[UpsertResponse]

New in version 0.2.11.

upsert(items: Sequence[Document], /, **kwargs: Any) → UpsertResponse¶

Beta

Added in 0.2.11. The API is subject to change.

Add or update documents in the vectorstore.

The upsert functionality should utilize the ID field of the Document object if it is provided. If the ID is not provided, the upsert method is free to generate an ID for the document.

When an ID is specified and the document already exists in the vectorstore, the upsert method should update the document with the new data. If the document does not exist, the upsert method should add the document to the vectorstore.

Parameters

items (Sequence[Document]) – Sequence of Documents to add to the vectorstore.
kwargs (Any) – Additional keyword arguments.

Returns

A response object that contains the list of IDs that were successfully added or updated in the vectorstore and the list of IDs that failed to be added or updated.

Return type

UpsertResponse

New in version 0.2.11.

Examples using AstraDB¶

Astra DB (Cassandra)

langchain_community.vectorstores.astradb.AstraDB¶

Examples using AstraDB¶

`langchain_community.vectorstores.astradb`.AstraDB¶