langchain/docs/extras/guides/evaluation/qa_benchmarking_pg.ipynb

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  {
   "cell_type": "markdown",
   "id": "984169ca",
   "metadata": {},
   "source": [
    "# Question Answering Benchmarking: Paul Graham Essay\n",
    "\n",
    "Here we go over how to benchmark performance on a question answering task over a Paul Graham essay.\n",
    "\n",
    "It is highly reccomended that you do any evaluation/benchmarking with tracing enabled. See [here](https://python.langchain.com/docs/modules/callbacks/how_to/tracing) for an explanation of what tracing is and how to set it up."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "3bd13ab7",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Comment this out if you are NOT using tracing\n",
    "import os\n",
    "\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/harrisonchase/.cache/huggingface/datasets/LangChainDatasets___json/LangChainDatasets--question-answering-paul-graham-76e8f711e038d742/0.0.0/0f7e3662623656454fcd2b650f34e886a7db4b9104504885bd462096cc7a9f51)\n"
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      "text/plain": [
       "  0%|          | 0/1 [00:00<?, ?it/s]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "from langchain.evaluation.loading import load_dataset\n",
    "\n",
    "dataset = load_dataset(\"question-answering-paul-graham\")"
   ]
  },
  {
   "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 an index over the data in question."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "c18680b5",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.document_loaders import TextLoader\n",
    "\n",
    "loader = TextLoader(\"../../modules/paul_graham_essay.txt\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "7f0de2b3",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.indexes import VectorstoreIndexCreator"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "ef84ff99",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Running Chroma using direct local API.\n",
      "Using DuckDB in-memory for database. Data will be transient.\n"
     ]
    }
   ],
   "source": [
    "vectorstore = VectorstoreIndexCreator().from_loaders([loader]).vectorstore"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f0b5d8f6",
   "metadata": {},
   "source": [
    "Now we can create a question answering chain."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "8843cb0c",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.chains import RetrievalQA\n",
    "from langchain.llms import OpenAI"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "573719a0",
   "metadata": {},
   "outputs": [],
   "source": [
    "chain = RetrievalQA.from_chain_type(\n",
    "    llm=OpenAI(),\n",
    "    chain_type=\"stuff\",\n",
    "    retriever=vectorstore.as_retriever(),\n",
    "    input_key=\"question\",\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "53b5aa23",
   "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": 18,
   "id": "3f81d951",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'question': 'What were the two main things the author worked on before college?',\n",
       " 'answer': 'The two main things the author worked on before college were writing and programming.',\n",
       " 'result': ' Writing and programming.'}"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "chain(dataset[0])"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "d0c16cd7",
   "metadata": {},
   "source": [
    "## Make many predictions\n",
    "Now we can make predictions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "24b4c66e",
   "metadata": {},
   "outputs": [],
   "source": [
    "predictions = chain.apply(dataset)"
   ]
  },
  {
   "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": 10,
   "id": "1d583f03",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'question': 'What were the two main things the author worked on before college?',\n",
       " 'answer': 'The two main things the author worked on before college were writing and programming.',\n",
       " 'result': ' Writing and programming.'}"
      ]
     },
     "execution_count": 10,
     "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": 11,
   "id": "d0a9341d",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.evaluation.qa import QAEvalChain"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "1612dec1",
   "metadata": {},
   "outputs": [],
   "source": [
    "llm = OpenAI(temperature=0)\n",
    "eval_chain = QAEvalChain.from_llm(llm)\n",
    "graded_outputs = eval_chain.evaluate(\n",
    "    dataset, predictions, question_key=\"question\", prediction_key=\"result\"\n",
    ")"
   ]
  },
  {
   "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": 13,
   "id": "2a689df5",
   "metadata": {},
   "outputs": [],
   "source": [
    "for i, prediction in enumerate(predictions):\n",
    "    prediction[\"grade\"] = graded_outputs[i][\"text\"]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "27b61215",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Counter({' CORRECT': 12, ' INCORRECT': 10})"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from collections import Counter\n",
    "\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": 15,
   "id": "47c692a1",
   "metadata": {},
   "outputs": [],
   "source": [
    "incorrect = [pred for pred in predictions if pred[\"grade\"] == \" INCORRECT\"]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "0ef976c1",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'question': 'What did the author write their dissertation on?',\n",
       " 'answer': 'The author wrote their dissertation on applications of continuations.',\n",
       " 'result': ' The author does not mention what their dissertation was on, so it is not known.',\n",
       " 'grade': ' INCORRECT'}"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "incorrect[0]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "7710401a",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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