langchain/docs/extras/modules/model_io/models/llms/integrations/gpt4all.ipynb

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    "# GPT4All\n",
    "\n",
    "[GitHub:nomic-ai/gpt4all](https://github.com/nomic-ai/gpt4all) an ecosystem of open-source chatbots trained on a massive collections of clean assistant data including code, stories and dialogue.\n",
    "\n",
    "This example goes over how to use LangChain to interact with `GPT4All` models."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
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    "tags": []
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     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Note: you may need to restart the kernel to use updated packages.\n"
     ]
    }
   ],
   "source": [
    "%pip install gpt4all > /dev/null"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "tags": []
   },
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   "source": [
    "from langchain import PromptTemplate, LLMChain\n",
    "from langchain.llms import GPT4All\n",
    "from langchain.callbacks.streaming_stdout import StreamingStdOutCallbackHandler"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
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   "source": [
    "template = \"\"\"Question: {question}\n",
    "\n",
    "Answer: Let's think step by step.\"\"\"\n",
    "\n",
    "prompt = PromptTemplate(template=template, input_variables=[\"question\"])"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Specify Model\n",
    "\n",
    "To run locally, download a compatible ggml-formatted model. \n",
    " \n",
    "**Download option 1**: The [gpt4all page](https://gpt4all.io/index.html) has a useful `Model Explorer` section:\n",
    "\n",
    "* Select a model of interest\n",
    "* Download using the UI and move the `.bin` to the `local_path` (noted below)\n",
    "\n",
    "For more info, visit https://github.com/nomic-ai/gpt4all.\n",
    "\n",
    "--- \n",
    "\n",
    "**Download option 2**: Uncomment the below block to download a model. \n",
    "\n",
    "* You may want to update `url` to a new version, whih can be browsed using the [gpt4all page](https://gpt4all.io/index.html)."
   ]
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  {
   "cell_type": "code",
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   "source": [
    "local_path = (\n",
    "    \"./models/ggml-gpt4all-l13b-snoozy.bin\"  # replace with your desired local file path\n",
    ")\n",
    "\n",
    "# import requests\n",
    "\n",
    "# from pathlib import Path\n",
    "# from tqdm import tqdm\n",
    "\n",
    "# Path(local_path).parent.mkdir(parents=True, exist_ok=True)\n",
    "\n",
    "# # Example model. Check https://github.com/nomic-ai/gpt4all for the latest models.\n",
    "# url = 'http://gpt4all.io/models/ggml-gpt4all-l13b-snoozy.bin'\n",
    "\n",
    "# # send a GET request to the URL to download the file. Stream since it's large\n",
    "# response = requests.get(url, stream=True)\n",
    "\n",
    "# # open the file in binary mode and write the contents of the response to it in chunks\n",
    "# # This is a large file, so be prepared to wait.\n",
    "# with open(local_path, 'wb') as f:\n",
    "#     for chunk in tqdm(response.iter_content(chunk_size=8192)):\n",
    "#         if chunk:\n",
    "#             f.write(chunk)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Callbacks support token-wise streaming\n",
    "callbacks = [StreamingStdOutCallbackHandler()]\n",
    "\n",
    "# Verbose is required to pass to the callback manager\n",
    "llm = GPT4All(model=local_path, callbacks=callbacks, verbose=True)\n",
    "\n",
    "# If you want to use a custom model add the backend parameter\n",
    "# Check https://docs.gpt4all.io/gpt4all_python.html for supported backends\n",
    "llm = GPT4All(model=local_path, backend=\"gptj\", callbacks=callbacks, verbose=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "llm_chain = LLMChain(prompt=prompt, llm=llm)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "question = \"What NFL team won the Super Bowl in the year Justin Bieber was born?\"\n",
    "\n",
    "llm_chain.run(question)"
   ]
  }
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