mirror of
https://github.com/hwchase17/langchain
synced 2024-11-02 09:40:22 +00:00
618 lines
22 KiB
Python
618 lines
22 KiB
Python
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from __future__ import annotations
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import uuid
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from typing import TYPE_CHECKING, Any, Dict, Iterable, List, Optional, Tuple, Type
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from langchain_core.documents import Document
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from langchain_core.embeddings import Embeddings
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from langchain_core.vectorstores import VectorStore
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if TYPE_CHECKING:
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from couchbase.cluster import Cluster
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class CouchbaseVectorStore(VectorStore):
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"""`Couchbase Vector Store` vector store.
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To use it, you need
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- a recent installation of the `couchbase` library
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- a Couchbase database with a pre-defined Search index with support for
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vector fields
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Example:
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.. code-block:: python
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from langchain_community.vectorstores import CouchbaseVectorStore
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from langchain_openai import OpenAIEmbeddings
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from couchbase.cluster import Cluster
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from couchbase.auth import PasswordAuthenticator
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from couchbase.options import ClusterOptions
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from datetime import timedelta
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auth = PasswordAuthenticator(username, password)
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options = ClusterOptions(auth)
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connect_string = "couchbases://localhost"
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cluster = Cluster(connect_string, options)
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# Wait until the cluster is ready for use.
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cluster.wait_until_ready(timedelta(seconds=5))
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embeddings = OpenAIEmbeddings()
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vectorstore = CouchbaseVectorStore(
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cluster=cluster,
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bucket_name="",
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scope_name="",
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collection_name="",
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embedding=embeddings,
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index_name="vector-index",
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)
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vectorstore.add_texts(["hello", "world"])
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results = vectorstore.similarity_search("ola", k=1)
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"""
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# Default batch size
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DEFAULT_BATCH_SIZE = 100
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_metadata_key = "metadata"
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_default_text_key = "text"
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_default_embedding_key = "embedding"
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def _check_bucket_exists(self) -> bool:
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"""Check if the bucket exists in the linked Couchbase cluster"""
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bucket_manager = self._cluster.buckets()
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try:
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bucket_manager.get_bucket(self._bucket_name)
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return True
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except Exception:
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return False
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def _check_scope_and_collection_exists(self) -> bool:
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"""Check if the scope and collection exists in the linked Couchbase bucket
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Raises a ValueError if either is not found"""
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scope_collection_map: Dict[str, Any] = {}
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# Get a list of all scopes in the bucket
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for scope in self._bucket.collections().get_all_scopes():
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scope_collection_map[scope.name] = []
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# Get a list of all the collections in the scope
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for collection in scope.collections:
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scope_collection_map[scope.name].append(collection.name)
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# Check if the scope exists
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if self._scope_name not in scope_collection_map.keys():
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raise ValueError(
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f"Scope {self._scope_name} not found in Couchbase "
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f"bucket {self._bucket_name}"
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)
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# Check if the collection exists in the scope
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if self._collection_name not in scope_collection_map[self._scope_name]:
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raise ValueError(
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f"Collection {self._collection_name} not found in scope "
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f"{self._scope_name} in Couchbase bucket {self._bucket_name}"
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)
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return True
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def _check_index_exists(self) -> bool:
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"""Check if the Search index exists in the linked Couchbase cluster
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Raises a ValueError if the index does not exist"""
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if self._scoped_index:
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all_indexes = [
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index.name for index in self._scope.search_indexes().get_all_indexes()
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]
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if self._index_name not in all_indexes:
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raise ValueError(
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f"Index {self._index_name} does not exist. "
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" Please create the index before searching."
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)
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else:
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all_indexes = [
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index.name for index in self._cluster.search_indexes().get_all_indexes()
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]
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if self._index_name not in all_indexes:
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raise ValueError(
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f"Index {self._index_name} does not exist. "
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" Please create the index before searching."
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)
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return True
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def __init__(
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self,
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cluster: Cluster,
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bucket_name: str,
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scope_name: str,
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collection_name: str,
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embedding: Embeddings,
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index_name: str,
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*,
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text_key: Optional[str] = _default_text_key,
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embedding_key: Optional[str] = _default_embedding_key,
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scoped_index: bool = True,
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) -> None:
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"""
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Initialize the Couchbase Vector Store.
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Args:
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cluster (Cluster): couchbase cluster object with active connection.
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bucket_name (str): name of bucket to store documents in.
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scope_name (str): name of scope in the bucket to store documents in.
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collection_name (str): name of collection in the scope to store documents in
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embedding (Embeddings): embedding function to use.
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index_name (str): name of the Search index to use.
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text_key (optional[str]): key in document to use as text.
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Set to text by default.
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embedding_key (optional[str]): key in document to use for the embeddings.
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Set to embedding by default.
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scoped_index (optional[bool]): specify whether the index is a scoped index.
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Set to True by default.
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"""
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try:
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from couchbase.cluster import Cluster
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except ImportError as e:
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raise ImportError(
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"Could not import couchbase python package. "
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"Please install couchbase SDK with `pip install couchbase`."
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) from e
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if not isinstance(cluster, Cluster):
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raise ValueError(
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f"cluster should be an instance of couchbase.Cluster, "
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f"got {type(cluster)}"
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)
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self._cluster = cluster
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if not embedding:
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raise ValueError("Embeddings instance must be provided.")
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if not bucket_name:
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raise ValueError("bucket_name must be provided.")
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if not scope_name:
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raise ValueError("scope_name must be provided.")
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if not collection_name:
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raise ValueError("collection_name must be provided.")
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if not index_name:
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raise ValueError("index_name must be provided.")
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self._bucket_name = bucket_name
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self._scope_name = scope_name
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self._collection_name = collection_name
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self._embedding_function = embedding
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self._text_key = text_key
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self._embedding_key = embedding_key
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self._index_name = index_name
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self._scoped_index = scoped_index
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# Check if the bucket exists
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if not self._check_bucket_exists():
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raise ValueError(
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f"Bucket {self._bucket_name} does not exist. "
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" Please create the bucket before searching."
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)
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try:
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self._bucket = self._cluster.bucket(self._bucket_name)
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self._scope = self._bucket.scope(self._scope_name)
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self._collection = self._scope.collection(self._collection_name)
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except Exception as e:
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raise ValueError(
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"Error connecting to couchbase. "
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"Please check the connection and credentials."
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) from e
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# Check if the scope and collection exists. Throws ValueError if they don't
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try:
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self._check_scope_and_collection_exists()
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except Exception as e:
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raise e
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# Check if the index exists. Throws ValueError if it doesn't
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try:
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self._check_index_exists()
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except Exception as e:
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raise e
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def add_texts(
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self,
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texts: Iterable[str],
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metadatas: Optional[List[Dict[str, Any]]] = None,
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ids: Optional[List[str]] = None,
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batch_size: Optional[int] = None,
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**kwargs: Any,
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) -> List[str]:
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"""Run texts through the embeddings and persist in vectorstore.
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If the document IDs are passed, the existing documents (if any) will be
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overwritten with the new ones.
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Args:
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texts (Iterable[str]): Iterable of strings to add to the vectorstore.
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metadatas (Optional[List[Dict]]): Optional list of metadatas associated
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with the texts.
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ids (Optional[List[str]]): Optional list of ids associated with the texts.
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IDs have to be unique strings across the collection.
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If it is not specified uuids are generated and used as ids.
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batch_size (Optional[int]): Optional batch size for bulk insertions.
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Default is 100.
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Returns:
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List[str]:List of ids from adding the texts into the vectorstore.
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"""
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from couchbase.exceptions import DocumentExistsException
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if not batch_size:
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batch_size = self.DEFAULT_BATCH_SIZE
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doc_ids: List[str] = []
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if ids is None:
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ids = [uuid.uuid4().hex for _ in texts]
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if metadatas is None:
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metadatas = [{} for _ in texts]
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embedded_texts = self._embedding_function.embed_documents(list(texts))
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documents_to_insert = [
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{
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id: {
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self._text_key: text,
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self._embedding_key: vector,
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self._metadata_key: metadata,
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}
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for id, text, vector, metadata in zip(
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ids, texts, embedded_texts, metadatas
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)
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}
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]
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# Insert in batches
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for i in range(0, len(documents_to_insert), batch_size):
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batch = documents_to_insert[i : i + batch_size]
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try:
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result = self._collection.upsert_multi(batch[0])
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if result.all_ok:
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doc_ids.extend(batch[0].keys())
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except DocumentExistsException as e:
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raise ValueError(f"Document already exists: {e}")
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return doc_ids
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def delete(self, ids: Optional[List[str]] = None, **kwargs: Any) -> Optional[bool]:
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"""Delete documents from the vector store by ids.
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Args:
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ids (List[str]): List of IDs of the documents to delete.
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batch_size (Optional[int]): Optional batch size for bulk deletions.
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Returns:
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bool: True if all the documents were deleted successfully, False otherwise.
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"""
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from couchbase.exceptions import DocumentNotFoundException
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if ids is None:
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raise ValueError("No document ids provided to delete.")
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batch_size = kwargs.get("batch_size", self.DEFAULT_BATCH_SIZE)
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deletion_status = True
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# Delete in batches
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for i in range(0, len(ids), batch_size):
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batch = ids[i : i + batch_size]
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try:
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result = self._collection.remove_multi(batch)
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except DocumentNotFoundException as e:
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deletion_status = False
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raise ValueError(f"Document not found: {e}")
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deletion_status &= result.all_ok
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return deletion_status
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@property
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def embeddings(self) -> Embeddings:
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"""Return the query embedding object."""
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return self._embedding_function
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def _format_metadata(self, row_fields: Dict[str, Any]) -> Dict[str, Any]:
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"""Helper method to format the metadata from the Couchbase Search API.
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Args:
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row_fields (Dict[str, Any]): The fields to format.
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Returns:
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Dict[str, Any]: The formatted metadata.
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"""
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metadata = {}
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for key, value in row_fields.items():
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# Couchbase Search returns the metadata key with a prefix
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# `metadata.` We remove it to get the original metadata key
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if key.startswith(self._metadata_key):
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new_key = key.split(self._metadata_key + ".")[-1]
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metadata[new_key] = value
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else:
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metadata[key] = value
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return metadata
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def similarity_search_with_score_by_vector(
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self,
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embedding: List[float],
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k: int = 4,
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search_options: Optional[Dict[str, Any]] = {},
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**kwargs: Any,
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) -> List[Tuple[Document, float]]:
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"""Return docs most similar to embedding vector with their scores.
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Args:
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embedding (List[float]): Embedding vector to look up documents similar to.
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k (int): Number of Documents to return.
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Defaults to 4.
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search_options (Optional[Dict[str, Any]]): Optional search options that are
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passed to Couchbase search.
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Defaults to empty dictionary.
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fields (Optional[List[str]]): Optional list of fields to include in the
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metadata of results. Note that these need to be stored in the index.
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If nothing is specified, defaults to all the fields stored in the index.
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Returns:
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List of (Document, score) that are the most similar to the query vector.
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"""
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import couchbase.search as search
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from couchbase.options import SearchOptions
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from couchbase.vector_search import VectorQuery, VectorSearch
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fields = kwargs.get("fields", ["*"])
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# Document text field needs to be returned from the search
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if fields != ["*"] and self._text_key not in fields:
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fields.append(self._text_key)
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search_req = search.SearchRequest.create(
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VectorSearch.from_vector_query(
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VectorQuery(
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self._embedding_key,
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embedding,
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k,
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)
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)
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)
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try:
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if self._scoped_index:
|
||
|
|
search_iter = self._scope.search(
|
||
|
|
self._index_name,
|
||
|
|
search_req,
|
||
|
|
SearchOptions(
|
||
|
|
limit=k,
|
||
|
|
fields=fields,
|
||
|
|
raw=search_options,
|
||
|
|
),
|
||
|
|
)
|
||
|
|
|
||
|
|
else:
|
||
|
|
search_iter = self._cluster.search(
|
||
|
|
index=self._index_name,
|
||
|
|
request=search_req,
|
||
|
|
options=SearchOptions(limit=k, fields=fields, raw=search_options),
|
||
|
|
)
|
||
|
|
|
||
|
|
docs_with_score = []
|
||
|
|
|
||
|
|
# Parse the results
|
||
|
|
for row in search_iter.rows():
|
||
|
|
text = row.fields.pop(self._text_key, "")
|
||
|
|
|
||
|
|
# Format the metadata from Couchbase
|
||
|
|
metadata = self._format_metadata(row.fields)
|
||
|
|
|
||
|
|
score = row.score
|
||
|
|
doc = Document(page_content=text, metadata=metadata)
|
||
|
|
docs_with_score.append((doc, score))
|
||
|
|
|
||
|
|
except Exception as e:
|
||
|
|
raise ValueError(f"Search failed with error: {e}")
|
||
|
|
|
||
|
|
return docs_with_score
|
||
|
|
|
||
|
|
def similarity_search(
|
||
|
|
self,
|
||
|
|
query: str,
|
||
|
|
k: int = 4,
|
||
|
|
search_options: Optional[Dict[str, Any]] = {},
|
||
|
|
**kwargs: Any,
|
||
|
|
) -> List[Document]:
|
||
|
|
"""Return documents most similar to embedding vector with their scores.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
query (str): Query to look up for similar documents
|
||
|
|
k (int): Number of Documents to return.
|
||
|
|
Defaults to 4.
|
||
|
|
search_options (Optional[Dict[str, Any]]): Optional search options that are
|
||
|
|
passed to Couchbase search.
|
||
|
|
Defaults to empty dictionary
|
||
|
|
fields (Optional[List[str]]): Optional list of fields to include in the
|
||
|
|
metadata of results. Note that these need to be stored in the index.
|
||
|
|
If nothing is specified, defaults to all the fields stored in the index.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
List of Documents most similar to the query.
|
||
|
|
"""
|
||
|
|
query_embedding = self.embeddings.embed_query(query)
|
||
|
|
docs_with_scores = self.similarity_search_with_score_by_vector(
|
||
|
|
query_embedding, k, search_options, **kwargs
|
||
|
|
)
|
||
|
|
return [doc for doc, _ in docs_with_scores]
|
||
|
|
|
||
|
|
def similarity_search_with_score(
|
||
|
|
self,
|
||
|
|
query: str,
|
||
|
|
k: int = 4,
|
||
|
|
search_options: Optional[Dict[str, Any]] = {},
|
||
|
|
**kwargs: Any,
|
||
|
|
) -> List[Tuple[Document, float]]:
|
||
|
|
"""Return documents that are most similar to the query with their scores.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
query (str): Query to look up for similar documents
|
||
|
|
k (int): Number of Documents to return.
|
||
|
|
Defaults to 4.
|
||
|
|
search_options (Optional[Dict[str, Any]]): Optional search options that are
|
||
|
|
passed to Couchbase search.
|
||
|
|
Defaults to empty dictionary.
|
||
|
|
fields (Optional[List[str]]): Optional list of fields to include in the
|
||
|
|
metadata of results. Note that these need to be stored in the index.
|
||
|
|
If nothing is specified, defaults to text and metadata fields.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
List of (Document, score) that are most similar to the query.
|
||
|
|
"""
|
||
|
|
query_embedding = self.embeddings.embed_query(query)
|
||
|
|
docs_with_score = self.similarity_search_with_score_by_vector(
|
||
|
|
query_embedding, k, search_options, **kwargs
|
||
|
|
)
|
||
|
|
return docs_with_score
|
||
|
|
|
||
|
|
def similarity_search_by_vector(
|
||
|
|
self,
|
||
|
|
embedding: List[float],
|
||
|
|
k: int = 4,
|
||
|
|
search_options: Optional[Dict[str, Any]] = {},
|
||
|
|
**kwargs: Any,
|
||
|
|
) -> List[Document]:
|
||
|
|
"""Return documents that are most similar to the vector embedding.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
embedding (List[float]): Embedding to look up documents similar to.
|
||
|
|
k (int): Number of Documents to return.
|
||
|
|
Defaults to 4.
|
||
|
|
search_options (Optional[Dict[str, Any]]): Optional search options that are
|
||
|
|
passed to Couchbase search.
|
||
|
|
Defaults to empty dictionary.
|
||
|
|
fields (Optional[List[str]]): Optional list of fields to include in the
|
||
|
|
metadata of results. Note that these need to be stored in the index.
|
||
|
|
If nothing is specified, defaults to document text and metadata fields.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
List of Documents most similar to the query.
|
||
|
|
"""
|
||
|
|
docs_with_score = self.similarity_search_with_score_by_vector(
|
||
|
|
embedding, k, search_options, **kwargs
|
||
|
|
)
|
||
|
|
return [doc for doc, _ in docs_with_score]
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _from_kwargs(
|
||
|
|
cls: Type[CouchbaseVectorStore],
|
||
|
|
embedding: Embeddings,
|
||
|
|
**kwargs: Any,
|
||
|
|
) -> CouchbaseVectorStore:
|
||
|
|
"""Initialize the Couchbase vector store from keyword arguments for the
|
||
|
|
vector store.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
embedding: Embedding object to use to embed text.
|
||
|
|
**kwargs: Keyword arguments to initialize the vector store with.
|
||
|
|
Accepted arguments are:
|
||
|
|
- cluster
|
||
|
|
- bucket_name
|
||
|
|
- scope_name
|
||
|
|
- collection_name
|
||
|
|
- index_name
|
||
|
|
- text_key
|
||
|
|
- embedding_key
|
||
|
|
- scoped_index
|
||
|
|
|
||
|
|
"""
|
||
|
|
cluster = kwargs.get("cluster", None)
|
||
|
|
bucket_name = kwargs.get("bucket_name", None)
|
||
|
|
scope_name = kwargs.get("scope_name", None)
|
||
|
|
collection_name = kwargs.get("collection_name", None)
|
||
|
|
index_name = kwargs.get("index_name", None)
|
||
|
|
text_key = kwargs.get("text_key", cls._default_text_key)
|
||
|
|
embedding_key = kwargs.get("embedding_key", cls._default_embedding_key)
|
||
|
|
scoped_index = kwargs.get("scoped_index", True)
|
||
|
|
|
||
|
|
return cls(
|
||
|
|
embedding=embedding,
|
||
|
|
cluster=cluster,
|
||
|
|
bucket_name=bucket_name,
|
||
|
|
scope_name=scope_name,
|
||
|
|
collection_name=collection_name,
|
||
|
|
index_name=index_name,
|
||
|
|
text_key=text_key,
|
||
|
|
embedding_key=embedding_key,
|
||
|
|
scoped_index=scoped_index,
|
||
|
|
)
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def from_texts(
|
||
|
|
cls: Type[CouchbaseVectorStore],
|
||
|
|
texts: List[str],
|
||
|
|
embedding: Embeddings,
|
||
|
|
metadatas: Optional[List[Dict[Any, Any]]] = None,
|
||
|
|
**kwargs: Any,
|
||
|
|
) -> CouchbaseVectorStore:
|
||
|
|
"""Construct a Couchbase vector store from a list of texts.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
.. code-block:: python
|
||
|
|
|
||
|
|
from langchain_community.vectorstores import CouchbaseVectorStore
|
||
|
|
from langchain_openai import OpenAIEmbeddings
|
||
|
|
|
||
|
|
from couchbase.cluster import Cluster
|
||
|
|
from couchbase.auth import PasswordAuthenticator
|
||
|
|
from couchbase.options import ClusterOptions
|
||
|
|
from datetime import timedelta
|
||
|
|
|
||
|
|
auth = PasswordAuthenticator(username, password)
|
||
|
|
options = ClusterOptions(auth)
|
||
|
|
connect_string = "couchbases://localhost"
|
||
|
|
cluster = Cluster(connect_string, options)
|
||
|
|
|
||
|
|
# Wait until the cluster is ready for use.
|
||
|
|
cluster.wait_until_ready(timedelta(seconds=5))
|
||
|
|
|
||
|
|
embeddings = OpenAIEmbeddings()
|
||
|
|
|
||
|
|
texts = ["hello", "world"]
|
||
|
|
|
||
|
|
vectorstore = CouchbaseVectorStore.from_texts(
|
||
|
|
texts,
|
||
|
|
embedding=embeddings,
|
||
|
|
cluster=cluster,
|
||
|
|
bucket_name="",
|
||
|
|
scope_name="",
|
||
|
|
collection_name="",
|
||
|
|
index_name="vector-index",
|
||
|
|
)
|
||
|
|
|
||
|
|
Args:
|
||
|
|
texts (List[str]): list of texts to add to the vector store.
|
||
|
|
embedding (Embeddings): embedding function to use.
|
||
|
|
metadatas (optional[List[Dict]): list of metadatas to add to documents.
|
||
|
|
**kwargs: Keyword arguments used to initialize the vector store with and/or
|
||
|
|
passed to `add_texts` method. Check the constructor and/or `add_texts`
|
||
|
|
for the list of accepted arguments.
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
A Couchbase vector store.
|
||
|
|
|
||
|
|
"""
|
||
|
|
vector_store = cls._from_kwargs(embedding, **kwargs)
|
||
|
|
batch_size = kwargs.get("batch_size", vector_store.DEFAULT_BATCH_SIZE)
|
||
|
|
ids = kwargs.get("ids", None)
|
||
|
|
vector_store.add_texts(
|
||
|
|
texts, metadatas=metadatas, ids=ids, batch_size=batch_size
|
||
|
|
)
|
||
|
|
|
||
|
|
return vector_store
|