langchain/docs/extras/integrations/vectorstores/weaviate.ipynb

{
 "cells": [
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "683953b3",
   "metadata": {},
   "source": [
    "# Weaviate\n",
    "\n",
    ">[Weaviate](https://weaviate.io/) is an open-source vector database. It allows you to store data objects and vector embeddings from your favorite ML-models, and scale seamlessly into billions of data objects.\n",
    "\n",
    "This notebook shows how to use functionality related to the `Weaviate`vector database.\n",
    "\n",
    "See the `Weaviate` [installation instructions](https://weaviate.io/developers/weaviate/installation)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "e9ab167c-fffc-4d30-b1c1-37cc1b641698",
   "metadata": {
    "tags": []
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Requirement already satisfied: weaviate-client in /workspaces/langchain/.venv/lib/python3.9/site-packages (3.19.1)\n",
      "Requirement already satisfied: requests<2.29.0,>=2.28.0 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from weaviate-client) (2.28.2)\n",
      "Requirement already satisfied: validators<=0.21.0,>=0.18.2 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from weaviate-client) (0.20.0)\n",
      "Requirement already satisfied: tqdm<5.0.0,>=4.59.0 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from weaviate-client) (4.65.0)\n",
      "Requirement already satisfied: authlib>=1.1.0 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from weaviate-client) (1.2.0)\n",
      "Requirement already satisfied: cryptography>=3.2 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from authlib>=1.1.0->weaviate-client) (40.0.2)\n",
      "Requirement already satisfied: charset-normalizer<4,>=2 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from requests<2.29.0,>=2.28.0->weaviate-client) (3.1.0)\n",
      "Requirement already satisfied: idna<4,>=2.5 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from requests<2.29.0,>=2.28.0->weaviate-client) (3.4)\n",
      "Requirement already satisfied: urllib3<1.27,>=1.21.1 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from requests<2.29.0,>=2.28.0->weaviate-client) (1.26.15)\n",
      "Requirement already satisfied: certifi>=2017.4.17 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from requests<2.29.0,>=2.28.0->weaviate-client) (2023.5.7)\n",
      "Requirement already satisfied: decorator>=3.4.0 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from validators<=0.21.0,>=0.18.2->weaviate-client) (5.1.1)\n",
      "Requirement already satisfied: cffi>=1.12 in /workspaces/langchain/.venv/lib/python3.9/site-packages (from cryptography>=3.2->authlib>=1.1.0->weaviate-client) (1.15.1)\n",
      "Requirement already satisfied: pycparser in /workspaces/langchain/.venv/lib/python3.9/site-packages (from cffi>=1.12->cryptography>=3.2->authlib>=1.1.0->weaviate-client) (2.21)\n"
     ]
    }
   ],
   "source": [
    "!pip install weaviate-client"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "6b34828d-e627-4d85-aabd-eeb15d9f4b00",
   "metadata": {},
   "source": [
    "We want to use `OpenAIEmbeddings` so we have to get the OpenAI API Key."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "37697b9f-fbb2-430e-b95d-28d6eb83486d",
   "metadata": {},
   "outputs": [],
   "source": [
    "import os\n",
    "import getpass\n",
    "\n",
    "os.environ[\"OPENAI_API_KEY\"] = getpass.getpass(\"OpenAI API Key:\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "fea2dbae-a609-4458-a05f-f1c8e1f37c6f",
   "metadata": {},
   "outputs": [],
   "source": [
    "WEAVIATE_URL = getpass.getpass(\"WEAVIATE_URL:\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "53b7ce2d-3c09-4d1c-b66b-5769ce6746ae",
   "metadata": {},
   "outputs": [],
   "source": [
    "os.environ[\"WEAVIATE_API_KEY\"] = getpass.getpass(\"WEAVIATE_API_KEY:\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "aac9563e",
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "from langchain.embeddings.openai import OpenAIEmbeddings\n",
    "from langchain.text_splitter import CharacterTextSplitter\n",
    "from langchain.vectorstores import Weaviate\n",
    "from langchain.document_loaders import TextLoader"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "a3c3999a",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.document_loaders import TextLoader\n",
    "\n",
    "loader = TextLoader(\"../../../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()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "21e9e528",
   "metadata": {},
   "outputs": [],
   "source": [
    "db = Weaviate.from_documents(docs, embeddings, weaviate_url=WEAVIATE_URL, by_text=False)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "b4170176",
   "metadata": {},
   "outputs": [],
   "source": [
    "query = \"What did the president say about Ketanji Brown Jackson\"\n",
    "docs = db.similarity_search(query)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "ecf3b890",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Tonight. I call on the Senate to: Pass the Freedom to Vote Act. Pass the John Lewis Voting Rights Act. And while you’re at it, pass the Disclose Act so Americans can know who is funding our elections. \n",
      "\n",
      "Tonight, I’d like to honor someone who has dedicated his life to serve this country: Justice Stephen Breyer—an Army veteran, Constitutional scholar, and retiring Justice of the United States Supreme Court. Justice Breyer, thank you for your service. \n",
      "\n",
      "One of the most serious constitutional responsibilities a President has is nominating someone to serve on the United States Supreme Court. \n",
      "\n",
      "And I did that 4 days ago, when I nominated Circuit Court of Appeals Judge Ketanji Brown Jackson. One of our nation’s top legal minds, who will continue Justice Breyer’s legacy of excellence.\n"
     ]
    }
   ],
   "source": [
    "print(docs[0].page_content)"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "a15863ee",
   "metadata": {},
   "source": [
    "## Similarity search with score"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "64e03db8",
   "metadata": {},
   "source": [
    "Sometimes we might want to perform the search, but also obtain a relevancy score to know how good is a particular result. \n",
    "The returned distance score is cosine distance. Therefore, a lower score is better."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "102105a1",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(Document(page_content='Tonight. I call on the Senate to: Pass the Freedom to Vote Act. Pass the John Lewis Voting Rights Act. And while you’re at it, pass the Disclose Act so Americans can know who is funding our elections. \\n\\nTonight, I’d like to honor someone who has dedicated his life to serve this country: Justice Stephen Breyer—an Army veteran, Constitutional scholar, and retiring Justice of the United States Supreme Court. Justice Breyer, thank you for your service. \\n\\nOne of the most serious constitutional responsibilities a President has is nominating someone to serve on the United States Supreme Court. \\n\\nAnd I did that 4 days ago, when I nominated Circuit Court of Appeals Judge Ketanji Brown Jackson. One of our nation’s top legal minds, who will continue Justice Breyer’s legacy of excellence.', metadata={'_additional': {'vector': [-0.015289668, -0.011418287, -0.018540842, 0.00274522, 0.008310737, 0.014179829, 0.0080104275, -0.0010217049, -0.022327352, -0.0055002323, 0.018958665, 0.0020548347, -0.0044393567, -0.021609223, -0.013709779, -0.004543812, 0.025722157, 0.01821442, 0.031728342, -0.031388864, -0.01051083, -0.029978717, 0.011555385, 0.0009751897, 0.014675993, -0.02102166, 0.0301354, -0.031754456, 0.013526983, -0.03392191, 0.002800712, -0.0027778621, -0.024259781, -0.006202043, -0.019950991, 0.0176138, -0.0001134321, 0.008343379, 0.034209162, -0.027654583, 0.03149332, -0.0008389079, 0.0053696632, -0.0024644958, -0.016582303, 0.0066720927, -0.005036711, -0.035514854, 0.002942706, 0.02958701, 0.032825127, 0.015694432, -0.019846536, -0.024520919, -0.021974817, -0.0063293483, -0.01081114, -0.0084282495, 0.003025944, -0.010210521, 0.008780787, 0.014793505, -0.006486031, 0.011966679, 0.01774437, -0.006985459, -0.015459408, 0.01625588, -0.016007798, 0.01706541, 0.035567082, 0.0029900377, 0.021543937, -0.0068483613, 0.040868197, -0.010909067, -0.03339963, 0.010954766, -0.014689049, -0.021596165, 0.0025607906, -0.01599474, -0.017757427, -0.0041651614, 0.010752384, 0.0053598704, -0.00019248774, 0.008480477, -0.010517359, -0.005017126, 0.0020434097, 0.011699011, 0.0051379027, 0.021687564, -0.010830725, 0.020734407, -0.006606808, 0.029769806, 0.02817686, -0.047318324, 0.024338122, -0.001150642, -0.026231378, -0.012325744, -0.0318328, -0.0094989175, -0.00897664, 0.004736402, 0.0046482678, 0.0023241339, -0.005826656, 0.0072531262, 0.015498579, -0.0077819317, -0.011953622, -0.028934162, -0.033974137, -0.01574666, 0.0086306315, -0.029299757, 0.030213742, -0.0033148287, 0.013448641, -0.013474754, 0.015851116, 0.0076578907, -0.037421167, -0.015185213, 0.010719741, -0.014636821, 0.0001918757, 0.011783881, 0.0036330915, -0.02132197, 0.0031010215, 0.0024334856, -0.0033229894, 0.050086394, 0.0031973163, -0.01115062, 0.004837593, 0.01298512, -0.018645298, -0.02992649, 0.004837593, 0.0067634913, 0.02992649, 0.0145062525, 0.00566018, -0.0017055618, -0.0056667086, 0.012697867, 0.0150677, -0.007559964, -0.01991182, -0.005268472, -0.008650217, -0.008702445, 0.027550127, 0.0018296026, 0.0018589807, -0.033295177, 0.0036265631, -0.0060290387, 0.014349569, 0.019898765, 0.00023339267, 0.0034568228, -0.018958665, 0.012031963, 0.005186866, 0.020747464, -0.03817847, 0.028202975, -0.01340947, 0.00091643346, 0.014884903, -0.02314994, -0.024468692, 0.0004859627, 0.018828096, 0.012906778, 0.027941836, 0.027550127, -0.015028529, 0.018606128, 0.03449641, -0.017757427, -0.016020855, -0.012142947, 0.025304336, 0.00821281, -0.0025461016, -0.01902395, -0.635507, -0.030083172, 0.0177052, -0.0104912445, 0.012502013, -0.0010747487, 0.00465806, 0.020825805, -0.006887532, 0.013892576, -0.019977106, 0.029952602, 0.0012004217, -0.015211326, -0.008708973, -0.017809656, 0.008578404, -0.01612531, 0.022614606, -0.022327352, -0.032616217, 0.0050693536, -0.020629952, -0.01357921, 0.011477043, 0.0013938275, -0.0052390937, 0.0142581705, -0.013200559, 0.013252786, -0.033582427, 0.030579336, -0.011568441, 0.0038387382, 0.049564116, 0.016791213, -0.01991182, 0.010889481, -0.0028251936, 0.035932675, -0.02183119, -0.008611047, 0.025121538, 0.
       " 0.8154189703772676)"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "docs = db.similarity_search_with_score(query, by_text=False)\n",
    "docs[0]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8fc3487b",
   "metadata": {},
   "source": [
    "# Persistance"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "281c0fcc",
   "metadata": {},
   "source": [
    "Anything uploaded to weaviate is automatically persistent into the database. You do not need to call any specific method or pass any param for this to happen."
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "05fd146c",
   "metadata": {},
   "source": [
    "# Retriever options"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "503e2e75",
   "metadata": {},
   "source": [
    "## Retriever options\n",
    "\n",
    "This section goes over different options for how to use Weaviate as a retriever.\n",
    "\n",
    "### MMR\n",
    "\n",
    "In addition to using similarity search in the retriever object, you can also use `mmr`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "8b7df7ae",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Document(page_content='Tonight. I call on the Senate to: Pass the Freedom to Vote Act. Pass the John Lewis Voting Rights Act. And while you’re at it, pass the Disclose Act so Americans can know who is funding our elections. \\n\\nTonight, I’d like to honor someone who has dedicated his life to serve this country: Justice Stephen Breyer—an Army veteran, Constitutional scholar, and retiring Justice of the United States Supreme Court. Justice Breyer, thank you for your service. \\n\\nOne of the most serious constitutional responsibilities a President has is nominating someone to serve on the United States Supreme Court. \\n\\nAnd I did that 4 days ago, when I nominated Circuit Court of Appeals Judge Ketanji Brown Jackson. One of our nation’s top legal minds, who will continue Justice Breyer’s legacy of excellence.', metadata={'source': '../../../state_of_the_union.txt'})"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "retriever = db.as_retriever(search_type=\"mmr\")\n",
    "retriever.get_relevant_documents(query)[0]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "fbd7a6cb",
   "metadata": {},
   "source": [
    "## Question Answering with Sources"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f349acb9",
   "metadata": {},
   "source": [
    "This section goes over how to do question-answering with sources over an Index. It does this by using the `RetrievalQAWithSourcesChain`, which does the lookup of the documents from an Index. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "5e824f3b",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.chains import RetrievalQAWithSourcesChain\n",
    "from langchain import OpenAI"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "61209cc3",
   "metadata": {},
   "outputs": [],
   "source": [
    "with open(\"../../../state_of_the_union.txt\") as f:\n",
    "    state_of_the_union = f.read()\n",
    "text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)\n",
    "texts = text_splitter.split_text(state_of_the_union)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "4abc3d37",
   "metadata": {},
   "outputs": [],
   "source": [
    "docsearch = Weaviate.from_texts(\n",
    "    texts,\n",
    "    embeddings,\n",
    "    weaviate_url=WEAVIATE_URL,\n",
    "    by_text=False,\n",
    "    metadatas=[{\"source\": f\"{i}-pl\"} for i in range(len(texts))],\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "c7062393",
   "metadata": {},
   "outputs": [],
   "source": [
    "chain = RetrievalQAWithSourcesChain.from_chain_type(\n",
    "    OpenAI(temperature=0), chain_type=\"stuff\", retriever=docsearch.as_retriever()\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "7e41b773",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'answer': \" The president honored Justice Breyer for his service and mentioned his legacy of excellence. He also nominated Circuit Court of Appeals Judge Ketanji Brown Jackson to continue Justice Breyer's legacy.\\n\",\n",
       " 'sources': '31-pl, 34-pl'}"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "chain(\n",
    "    {\"question\": \"What did the president say about Justice Breyer\"},\n",
    "    return_only_outputs=True,\n",
    ")"
   ]
  }
 ],
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