langchain/docs/use_cases/evaluation/agent_vectordb_sota_pg.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "984169ca",
   "metadata": {},
   "source": [
    "# Agent VectorDB Question Answering Benchmarking\n",
    "\n",
    "Here we go over how to benchmark performance on a question answering task using an agent to route between multiple vectordatabases.\n",
    "\n",
    "It is highly reccomended that you do any evaluation/benchmarking with tracing enabled. See [here](https://langchain.readthedocs.io/en/latest/tracing.html) for an explanation of what tracing is and how to set it up."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "7b57a50f",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Comment this out if you are NOT using tracing\n",
    "import os\n",
    "os.environ[\"LANGCHAIN_HANDLER\"] = \"langchain\""
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8a16b75d",
   "metadata": {},
   "source": [
    "## Loading the data\n",
    "First, let's load the data."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "5b2d5e98",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Found cached dataset json (/Users/qt/.cache/huggingface/datasets/LangChainDatasets___json/LangChainDatasets--agent-vectordb-qa-sota-pg-d3ae24016b514f92/0.0.0/fe5dd6ea2639a6df622901539cb550cf8797e5a6b2dd7af1cf934bed8e233e6e)\n",
      "100%|██████████| 1/1 [00:00<00:00, 414.42it/s]\n"
     ]
    }
   ],
   "source": [
    "from langchain.evaluation.loading import load_dataset\n",
    "dataset = load_dataset(\"agent-vectordb-qa-sota-pg\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "61375342",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'question': 'What is the purpose of the NATO Alliance?',\n",
       " 'answer': 'The purpose of the NATO Alliance is to secure peace and stability in Europe after World War 2.',\n",
       " 'steps': [{'tool': 'State of Union QA System', 'tool_input': None},\n",
       "  {'tool': None, 'tool_input': 'What is the purpose of the NATO Alliance?'}]}"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dataset[0]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "02500304",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'question': 'What is the purpose of YC?',\n",
       " 'answer': 'The purpose of YC is to cause startups to be founded that would not otherwise have existed.',\n",
       " 'steps': [{'tool': 'Paul Graham QA System', 'tool_input': None},\n",
       "  {'tool': None, 'tool_input': 'What is the purpose of YC?'}]}"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dataset[-1]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "4ab6a716",
   "metadata": {},
   "source": [
    "## Setting up a chain\n",
    "Now we need to create some pipelines for doing question answering. Step one in that is creating indexes over the data in question."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "c18680b5",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.document_loaders import TextLoader\n",
    "loader = TextLoader(\"../../modules/state_of_the_union.txt\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "7f0de2b3",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.indexes import VectorstoreIndexCreator"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "ef84ff99",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Using embedded DuckDB without persistence: data will be transient\n"
     ]
    }
   ],
   "source": [
    "vectorstore_sota = VectorstoreIndexCreator(vectorstore_kwargs={\"collection_name\":\"sota\"}).from_loaders([loader]).vectorstore"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f0b5d8f6",
   "metadata": {},
   "source": [
    "Now we can create a question answering chain."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "8843cb0c",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.chains import RetrievalQA\n",
    "from langchain.llms import OpenAI"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "573719a0",
   "metadata": {},
   "outputs": [],
   "source": [
    "chain_sota = RetrievalQA.from_chain_type(llm=OpenAI(temperature=0), chain_type=\"stuff\", retriever=vectorstore_sota.as_retriever(), input_key=\"question\")\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e48b03d8",
   "metadata": {},
   "source": [
    "Now we do the same for the Paul Graham data."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "c2dbb014",
   "metadata": {},
   "outputs": [],
   "source": [
    "loader = TextLoader(\"../../modules/paul_graham_essay.txt\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "98d16f08",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Using embedded DuckDB without persistence: data will be transient\n"
     ]
    }
   ],
   "source": [
    "vectorstore_pg = VectorstoreIndexCreator(vectorstore_kwargs={\"collection_name\":\"paul_graham\"}).from_loaders([loader]).vectorstore"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "ec0aab02",
   "metadata": {},
   "outputs": [],
   "source": [
    "chain_pg = RetrievalQA.from_chain_type(llm=OpenAI(temperature=0), chain_type=\"stuff\", retriever=vectorstore_pg.as_retriever(), input_key=\"question\")\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "76b5f8fb",
   "metadata": {},
   "source": [
    "We can now set up an agent to route between them."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "id": "ade1aafa",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.agents import initialize_agent, Tool\n",
    "from langchain.agents import AgentType\n",
    "tools = [\n",
    "    Tool(\n",
    "        name = \"State of Union QA System\",\n",
    "        func=chain_sota.run,\n",
    "        description=\"useful for when you need to answer questions about the most recent state of the union address. Input should be a fully formed question.\"\n",
    "    ),\n",
    "    Tool(\n",
    "        name = \"Paul Graham System\",\n",
    "        func=chain_pg.run,\n",
    "        description=\"useful for when you need to answer questions about Paul Graham. Input should be a fully formed question.\"\n",
    "    ),\n",
    "]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "id": "104853f8",
   "metadata": {},
   "outputs": [],
   "source": [
    "agent = initialize_agent(tools, OpenAI(temperature=0), agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION, max_iterations=4)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7f036641",
   "metadata": {},
   "source": [
    "## Make a prediction\n",
    "\n",
    "First, we can make predictions one datapoint at a time. Doing it at this level of granularity allows use to explore the outputs in detail, and also is a lot cheaper than running over multiple datapoints"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "id": "4664e79f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'The purpose of the NATO Alliance is to secure peace and stability in Europe after World War 2.'"
      ]
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "agent.run(dataset[0]['question'])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "d0c16cd7",
   "metadata": {},
   "source": [
    "## Make many predictions\n",
    "Now we can make predictions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "id": "799f6c17",
   "metadata": {},
   "outputs": [],
   "source": [
    "predictions = []\n",
    "predicted_dataset = []\n",
    "error_dataset = []\n",
    "for data in dataset:\n",
    "    new_data = {\"input\": data[\"question\"], \"answer\": data[\"answer\"]}\n",
    "    try:\n",
    "        predictions.append(agent(new_data))\n",
    "        predicted_dataset.append(new_data)\n",
    "    except Exception:\n",
    "        error_dataset.append(new_data)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "49d969fb",
   "metadata": {},
   "source": [
    "## Evaluate performance\n",
    "Now we can evaluate the predictions. The first thing we can do is look at them by eye."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "id": "1d583f03",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'input': 'What is the purpose of the NATO Alliance?',\n",
       " 'answer': 'The purpose of the NATO Alliance is to secure peace and stability in Europe after World War 2.',\n",
       " 'output': 'The purpose of the NATO Alliance is to secure peace and stability in Europe after World War 2.'}"
      ]
     },
     "execution_count": 37,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "predictions[0]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "4783344b",
   "metadata": {},
   "source": [
    "Next, we can use a language model to score them programatically"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "id": "d0a9341d",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.evaluation.qa import QAEvalChain"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "id": "1612dec1",
   "metadata": {},
   "outputs": [],
   "source": [
    "llm = OpenAI(temperature=0)\n",
    "eval_chain = QAEvalChain.from_llm(llm)\n",
    "graded_outputs = eval_chain.evaluate(predicted_dataset, predictions, question_key=\"input\", prediction_key=\"output\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "79587806",
   "metadata": {},
   "source": [
    "We can add in the graded output to the `predictions` dict and then get a count of the grades."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "2a689df5",
   "metadata": {},
   "outputs": [],
   "source": [
    "for i, prediction in enumerate(predictions):\n",
    "    prediction['grade'] = graded_outputs[i]['text']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "id": "27b61215",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Counter({' CORRECT': 28, ' INCORRECT': 5})"
      ]
     },
     "execution_count": 41,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from collections import Counter\n",
    "Counter([pred['grade'] for pred in predictions])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "12fe30f4",
   "metadata": {},
   "source": [
    "We can also filter the datapoints to the incorrect examples and look at them."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "id": "47c692a1",
   "metadata": {},
   "outputs": [],
   "source": [
    "incorrect = [pred for pred in predictions if pred['grade'] == \" INCORRECT\"]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "id": "0ef976c1",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'input': 'What are the four common sense steps that the author suggests to move forward safely?',\n",
       " 'answer': 'The four common sense steps suggested by the author to move forward safely are: stay protected with vaccines and treatments, prepare for new variants, end the shutdown of schools and businesses, and stay vigilant.',\n",
       " 'output': 'The four common sense steps suggested in the most recent State of the Union address are: cutting the cost of prescription drugs, providing a pathway to citizenship for Dreamers, revising laws so businesses have the workers they need and families don’t wait decades to reunite, and protecting access to health care and preserving a woman’s right to choose.',\n",
       " 'grade': ' INCORRECT'}"
      ]
     },
     "execution_count": 43,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "incorrect[0]"
   ]
  }
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