docs: Add Databricks Vector Search example notebook (#14158)

This PR adds an example notebook for the Databricks Vector Search vector
store. It also adds an introduction to the Databricks Vector Search
product on the Databricks's provider page.

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/docs/integrations/providers/databricks.md

@@ -79,3 +79,9 @@ Databricks as an LLM provider
 
 The notebook [Wrap Databricks endpoints as LLMs](/docs/integrations/llms/databricks#wrapping-a-serving-endpoint-custom-model) demonstrates how to serve a custom model that has been registered by MLflow as a Databricks endpoint.
 It supports two types of endpoints: the serving endpoint, which is recommended for both production and development, and the cluster driver proxy app, which is recommended for interactive development. 
+
+
+Databricks Vector Search
+------------------------
+
+Databricks Vector Search is a serverless similarity search engine that allows you to store a vector representation of your data, including metadata, in a vector database. With Vector Search, you can create auto-updating vector search indexes from Delta tables managed by Unity Catalog and query them with a simple API to return the most similar vectors. See the notebook [Databricks Vector Search](/docs/integrations/vectorstores/databricks_vector_search) for instructions to use it with LangChain.

docs/docs/integrations/vectorstores/databricks_vector_search.ipynb

@@ -0,0 +1,385 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "5a8c5767-adfe-4b9d-a665-a898756d7a6c",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "# Databricks Vector Search\n",
+    "\n",
+    "Databricks Vector Search is a serverless similarity search engine that allows you to store a vector representation of your data, including metadata, in a vector database. With Vector Search, you can create auto-updating vector search indexes from Delta tables managed by Unity Catalog and query them with a simple API to return the most similar vectors.\n",
+    "\n",
+    "This notebook shows how to use LangChain with Databricks Vector Search."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "746cfacd-fb30-48fd-96a5-bbcc0d15ae49",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "Install `databricks-vectorsearch` and related Python packages used in this notebook."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "9258a3e7-e050-4390-9d3f-9adff1460dab",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "!pip install langchain-core databricks-vectorsearch openai tiktoken"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "f4f09d6d-002d-4cb0-a664-0a83bd2a13da",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "Use `OpenAIEmbeddings` for the embeddings."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "f11b902d-a772-45e0-bbd9-526218b717cc",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "import getpass\n",
+    "import os\n",
+    "\n",
+    "os.environ[\"OPENAI_API_KEY\"] = getpass.getpass(\"OpenAI API Key:\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "59b568f3-8db2-427e-9a4a-1df6fa7a1739",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "Split documents and get embeddings."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "b28e1c7b-eae4-4be8-abbd-8433c7557dc2",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "from langchain.document_loaders import TextLoader\n",
+    "from langchain.embeddings import OpenAIEmbeddings\n",
+    "from langchain.text_splitter import CharacterTextSplitter\n",
+    "\n",
+    "loader = TextLoader(\"../../modules/state_of_the_union.txt\")\n",
+    "documents = loader.load()\n",
+    "text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)\n",
+    "docs = text_splitter.split_documents(documents)\n",
+    "\n",
+    "embeddings = OpenAIEmbeddings()\n",
+    "emb_dim = len(embeddings.embed_query(\"hello\"))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "e8fcdda1-208a-45c9-816e-ff0d2c8f59d6",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "## Setup Databricks Vector Search client"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "9b87fff1-99e5-4d9f-aba3-d21a7ccc498e",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "from databricks.vector_search.client import VectorSearchClient\n",
+    "\n",
+    "vsc = VectorSearchClient()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Create a Vector Search Endpoint\n",
+    "This endpoint is used to create and access vector search indexes."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "vsc.create_endpoint(name=\"vector_search_demo_endpoint\", endpoint_type=\"STANDARD\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "81090f87-3efd-4c1e-9f58-8d6adba7553d",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "## Create Direct Vector Access Index\n",
+    "Direct Vector Access Index supports direct read and write of embedding vectors and metadata through a REST API or an SDK. For this index, you manage embedding vectors and index updates yourself."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "9389ec6b-5885-411f-a26e-1a4b03651f5c",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "vector_search_endpoint_name = \"vector_search_demo_endpoint\"\n",
+    "index_name = \"ml.llm.demo_index\"\n",
+    "\n",
+    "index = vsc.create_direct_access_index(\n",
+    "    endpoint_name=vector_search_endpoint_name,\n",
+    "    index_name=index_name,\n",
+    "    primary_key=\"id\",\n",
+    "    embedding_dimension=emb_dim,\n",
+    "    embedding_vector_column=\"text_vector\",\n",
+    "    schema={\n",
+    "        \"id\": \"string\",\n",
+    "        \"text\": \"string\",\n",
+    "        \"text_vector\": \"array<float>\",\n",
+    "        \"source\": \"string\",\n",
+    "    },\n",
+    ")\n",
+    "\n",
+    "index.describe()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "047a14c9-2f06-4f74-883d-815b2c69786c",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "from langchain.vectorstores import DatabricksVectorSearch\n",
+    "\n",
+    "dvs = DatabricksVectorSearch(\n",
+    "    index, text_column=\"text\", embedding=embeddings, columns=[\"source\"]\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "951bd581-2ced-497f-9c70-4fda902fd3a1",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "## Add docs to the index"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "1e85f235-901f-4cf5-845f-5dbf4ce42078",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "dvs.add_documents(docs)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "8bea6f0a-b305-455a-acba-99cc8c9350b5",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "## Similarity search"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "25c5a044-a61a-4929-9e65-a0f0462925df",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "query = \"What did the president say about Ketanji Brown Jackson\"\n",
+    "dvs.similarity_search(query)\n",
+    "print(docs[0].page_content)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "46e3f41b-dac2-4bed-91cb-a3914c25d275",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "source": [
+    "## Work with Delta Sync Index\n",
+    "\n",
+    "You can also use `DatabricksVectorSearch` to search in a Delta Sync Index. Delta Sync Index automatically syncs from a Delta table. You don't need to call `add_text`/`add_documents` manually. See [Databricks documentation page](https://docs.databricks.com/en/generative-ai/vector-search.html#delta-sync-index-with-managed-embeddings) for more details."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "application/vnd.databricks.v1+cell": {
+     "cellMetadata": {},
+     "inputWidgets": {},
+     "nuid": "0c1f448e-77ca-41ce-887c-15948e866a0e",
+     "showTitle": false,
+     "title": ""
+    }
+   },
+   "outputs": [],
+   "source": [
+    "dvs_delta_sync = DatabricksVectorSearch(\"catalog_name.schema_name.delta_sync_index\")\n",
+    "dvs_delta_sync.similarity_search(query)"
+   ]
+  }
+ ],
+ "metadata": {
+  "application/vnd.databricks.v1+notebook": {
+   "dashboards": [],
+   "language": "python",
+   "notebookMetadata": {
+    "pythonIndentUnit": 2
+   },
+   "notebookName": "databricks_vector_search",
+   "widgets": {}
+  },
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}

libs/community/langchain_community/vectorstores/databricks_vector_search.py

@@ -96,7 +96,7 @@ class DatabricksVectorSearch(VectorStore):
             )
 
     For more information on Databricks Vector Search, see `Databricks Vector Search
-    documentation <TODO: pending-link-to-documentation-page>`.
+    documentation: https://docs.databricks.com/en/generative-ai/vector-search.html.
 
     """