examples/How_to_format_inputs_to_ChatGPT_models.ipynb

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    "# How to format inputs to ChatGPT models\n",
    "\n",
    "ChatGPT is powered by `gpt-3.5-turbo`, OpenAI's most advanced model.\n",
    "\n",
    "You can build your own applications with `gpt-3.5-turbo` using the OpenAI API.\n",
    "\n",
    "Chat models take a series of messages as input, and return an AI-written message as output.\n",
    "\n",
    "This guide illustrates the chat format with a few example API calls."
   ]
  },
  {
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   "source": [
    "## 1. Import the openai library"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "# if needed, install and/or upgrade to the latest version of the OpenAI Python library\n",
    "%pip install --upgrade openai\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# import the OpenAI Python library for calling the OpenAI API\n",
    "import openai\n"
   ]
  },
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   "source": [
    "# 2. An example chat API call\n",
    "\n",
    "A chat API call has two required inputs:\n",
    "- `model`: the name of the model you want to use (e.g., `gpt-3.5-turbo`)\n",
    "- `messages`: a list of message objects, where each object has at least two fields:\n",
    "    - `role`: the role of the messenger (either `system`, `user`, or `assistant`)\n",
    "    - `content`: the content of the message (e.g., `Write me a beautiful poem`)\n",
    "\n",
    "Typically, a conversation will start with a system message, followed by alternating user and assistant messages, but you are not required to follow this format.\n",
    "\n",
    "Let's look at an example chat API calls to see how the chat format works in practice."
   ]
  },
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   "source": [
    "# Example OpenAI Python library request\n",
    "MODEL = \"gpt-3.5-turbo\"\n",
    "response = openai.ChatCompletion.create(\n",
    "    model=MODEL,\n",
    "    messages=[\n",
    "        {\"role\": \"system\", \"content\": \"You are a helpful assistant.\"},\n",
    "        {\"role\": \"user\", \"content\": \"Knock knock.\"},\n",
    "        {\"role\": \"assistant\", \"content\": \"Who's there?\"},\n",
    "        {\"role\": \"user\", \"content\": \"Orange.\"},\n",
    "    ],\n",
    "    temperature=0,\n",
    ")\n",
    "\n",
    "response\n"
   ]
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   "source": [
    "As you can see, the response object has a few fields:\n",
    "- `id`: the ID of the request\n",
    "- `object`: the type of object returned (e.g., `chat.completion`)\n",
    "- `created`: the timestamp of the request\n",
    "- `model`: the full name of the model used to generate the response\n",
    "- `usage`: the number of tokens used to generate the replies, counting prompt, completion, and total\n",
    "- `choices`: a list of completion objects (only one, unless you set `n` greater than 1)\n",
    "    - `message`: the message object generated by the model, with `role` and `content`\n",
    "    - `finish_reason`: the reason the model stopped generating text (either `stop`, or `length` if `max_tokens` limit was reached)\n",
    "    - `index`: the index of the completion in the list of choices"
   ]
  },
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   "source": [
    "Extract just the reply with:"
   ]
  },
  {
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   "source": [
    "response['choices'][0]['message']['content']\n"
   ]
  },
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   "source": [
    "Even non-conversation-based tasks can fit into the chat format, by placing the instruction in the first user message.\n",
    "\n",
    "For example, to ask the model to explain asynchronous programming in the style of the pirate Blackbeard, we can structure conversation as follows:"
   ]
  },
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   "source": [
    "# example with a system message\n",
    "response = openai.ChatCompletion.create(\n",
    "    model=MODEL,\n",
    "    messages=[\n",
    "        {\"role\": \"system\", \"content\": \"You are a helpful assistant.\"},\n",
    "        {\"role\": \"user\", \"content\": \"Explain asynchronous programming in the style of the pirate Blackbeard.\"},\n",
    "    ],\n",
    "    temperature=0,\n",
    ")\n",
    "\n",
    "print(response['choices'][0]['message']['content'])\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "# example without a system message\n",
    "response = openai.ChatCompletion.create(\n",
    "    model=MODEL,\n",
    "    messages=[\n",
    "        {\"role\": \"user\", \"content\": \"Explain asynchronous programming in the style of the pirate Blackbeard.\"},\n",
    "    ],\n",
    "    temperature=0,\n",
    ")\n",
    "\n",
    "print(response['choices'][0]['message']['content'])\n"
   ]
  },
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   "source": [
    "## 3. Tips for instructing gpt-3.5-turbo-0301\n",
    "\n",
    "Best practices for instructing models may change from model version to model version. The advice that follows applies to `gpt-3.5-turbo-0301` and may not apply to future models."
   ]
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    "### System messages\n",
    "\n",
    "The system message can be used to prime the assistant with different personalities or behaviors.\n",
    "\n",
    "However, the model does not generally pay as much attention to the system message, and therefore we recommend placing important instructions in the user message instead."
   ]
  },
  {
   "cell_type": "code",
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   "source": [
    "# An example of a system message that primes the assistant to explain concepts in great depth\n",
    "response = openai.ChatCompletion.create(\n",
    "    model=MODEL,\n",
    "    messages=[\n",
    "        {\"role\": \"system\", \"content\": \"You are a friendly and helpful teaching assistant. You explain concepts in great depth using simple terms, and you give examples to help people learn. At the end of each explanation, you ask a question to check for understanding\"},\n",
    "        {\"role\": \"user\", \"content\": \"Can you explain how fractions work?\"},\n",
    "    ],\n",
    "    temperature=0,\n",
    ")\n",
    "\n",
    "print(response[\"choices\"][0][\"message\"][\"content\"])\n"
   ]
  },
  {
   "cell_type": "code",
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   "source": [
    "# An example of a system message that primes the assistant to give brief, to-the-point answers\n",
    "response = openai.ChatCompletion.create(\n",
    "    model=MODEL,\n",
    "    messages=[\n",
    "        {\"role\": \"system\", \"content\": \"You are a laconic assistant. You reply with brief, to-the-point answers with no elaboration.\"},\n",
    "        {\"role\": \"user\", \"content\": \"Can you explain how fractions work?\"},\n",
    "    ],\n",
    "    temperature=0,\n",
    ")\n",
    "\n",
    "print(response[\"choices\"][0][\"message\"][\"content\"])\n"
   ]
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    "### Few-shot prompting\n",
    "\n",
    "In some cases, it's easier to show the model what you want rather than tell the model what you want.\n",
    "\n",
    "One way to show the model what you want is with faked example messages.\n",
    "\n",
    "For example:"
   ]
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  {
   "cell_type": "code",
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   "source": [
    "# An example of a faked few-shot conversation to prime the model into translating business jargon to simpler speech\n",
    "response = openai.ChatCompletion.create(\n",
    "    model=MODEL,\n",
    "    messages=[\n",
    "        {\"role\": \"system\", \"content\": \"You are a helpful, pattern-following assistant.\"},\n",
    "        {\"role\": \"user\", \"content\": \"Help me translate the following corporate jargon into plain English.\"},\n",
    "        {\"role\": \"assistant\", \"content\": \"Sure, I'd be happy to!\"},\n",
    "        {\"role\": \"user\", \"content\": \"New synergies will help drive top-line growth.\"},\n",
    "        {\"role\": \"assistant\", \"content\": \"Things working well together will increase revenue.\"},\n",
    "        {\"role\": \"user\", \"content\": \"Let's circle back when we have more bandwidth to touch base on opportunities for increased leverage.\"},\n",
    "        {\"role\": \"assistant\", \"content\": \"Let's talk later when we're less busy about how to do better.\"},\n",
    "        {\"role\": \"user\", \"content\": \"This late pivot means we don't have time to boil the ocean for the client deliverable.\"},\n",
    "    ],\n",
    "    temperature=0,\n",
    ")\n",
    "\n",
    "print(response[\"choices\"][0][\"message\"][\"content\"])\n"
   ]
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   "source": [
    "To help clarify that the example messages are not part of a real conversation, and shouldn't be referred back to by the model, you can instead set the `name` field of `system` messages to `example_user` and `example_assistant`.\n",
    "\n",
    "Transforming the few-shot example above, we could write:"
   ]
  },
  {
   "cell_type": "code",
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   "metadata": {},
   "outputs": [],
   "source": [
    "# The business jargon translation example, but with example names for the example messages\n",
    "response = openai.ChatCompletion.create(\n",
    "    model=MODEL,\n",
    "    messages=[\n",
    "        {\"role\": \"system\", \"content\": \"You are a helpful, pattern-following assistant that translates corporate jargon into plain English.\"},\n",
    "        {\"role\": \"system\", \"name\":\"example_user\", \"content\": \"New synergies will help drive top-line growth.\"},\n",
    "        {\"role\": \"system\", \"name\": \"example_assistant\", \"content\": \"Things working well together will increase revenue.\"},\n",
    "        {\"role\": \"system\", \"name\":\"example_user\", \"content\": \"Let's circle back when we have more bandwidth to touch base on opportunities for increased leverage.\"},\n",
    "        {\"role\": \"system\", \"name\": \"example_assistant\", \"content\": \"Let's talk later when we're less busy about how to do better.\"},\n",
    "        {\"role\": \"user\", \"content\": \"This late pivot means we don't have time to boil the ocean for the client deliverable.\"},\n",
    "    ],\n",
    "    temperature=0,\n",
    ")\n",
    "\n",
    "print(response[\"choices\"][0][\"message\"][\"content\"])\n"
   ]
  },
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   "source": [
    "Not every attempt at engineering conversations will succeed at first.\n",
    "\n",
    "If your first attempts fail, don't be afraid to experiment with different ways of priming or conditioning the model.\n",
    "\n",
    "As an example, one developer discovered an increase in accuracy when they inserted a user message that said \"Great job so far, these have been perfect\" to help condition the model into providing higher quality responses.\n",
    "\n",
    "For more ideas on how to lift the reliability of the models, consider reading our guide on [techniques to increase reliability](../techniques_to_improve_reliability.md). It was written for non-chat models, but many of its principles still apply."
   ]
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    "## 4. Counting tokens\n",
    "\n",
    "When you submit your request, the API transforms the messages into a sequence of tokens.\n",
    "\n",
    "The number of tokens used affects:\n",
    "- the cost of the request\n",
    "- the time it takes to generate the response\n",
    "- when the reply gets cut off from hitting the maximum token limit (4096 for `gpt-3.5-turbo`)\n",
    "\n",
    "As of Mar 01, 2023, you can use the following function to count the number of tokens that a list of messages will use."
   ]
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  {
   "cell_type": "code",
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   "source": [
    "import tiktoken\n",
    "\n",
    "\n",
    "def num_tokens_from_messages(messages, model=\"gpt-3.5-turbo-0301\"):\n",
    "    \"\"\"Returns the number of tokens used by a list of messages.\"\"\"\n",
    "    try:\n",
    "        encoding = tiktoken.encoding_for_model(model)\n",
    "    except KeyError:\n",
    "        encoding = tiktoken.get_encoding(\"cl100k_base\")\n",
    "    if model == \"gpt-3.5-turbo-0301\":  # note: future models may deviate from this\n",
    "        num_tokens = 0\n",
    "        for message in messages:\n",
    "            num_tokens += 4  # every message follows <im_start>{role/name}\\n{content}<im_end>\\n\n",
    "            for key, value in message.items():\n",
    "                num_tokens += len(encoding.encode(value))\n",
    "                if key == \"name\":  # if there's a name, the role is omitted\n",
    "                    num_tokens += -1  # role is always required and always 1 token\n",
    "        num_tokens += 2  # every reply is primed with <im_start>assistant\n",
    "        return num_tokens\n",
    "    else:\n",
    "        raise NotImplementedError(f\"\"\"num_tokens_from_messages() is not presently implemented for model {model}.\n",
    "See https://github.com/openai/openai-python/blob/main/chatml.md for information on how messages are converted to tokens.\"\"\")\n"
   ]
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   "source": [
    "messages = [\n",
    "    {\"role\": \"system\", \"content\": \"You are a helpful, pattern-following assistant that translates corporate jargon into plain English.\"},\n",
    "    {\"role\": \"system\", \"name\":\"example_user\", \"content\": \"New synergies will help drive top-line growth.\"},\n",
    "    {\"role\": \"system\", \"name\": \"example_assistant\", \"content\": \"Things working well together will increase revenue.\"},\n",
    "    {\"role\": \"system\", \"name\":\"example_user\", \"content\": \"Let's circle back when we have more bandwidth to touch base on opportunities for increased leverage.\"},\n",
    "    {\"role\": \"system\", \"name\": \"example_assistant\", \"content\": \"Let's talk later when we're less busy about how to do better.\"},\n",
    "    {\"role\": \"user\", \"content\": \"This late pivot means we don't have time to boil the ocean for the client deliverable.\"},\n",
    "]\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# example token count from the function defined above\n",
    "print(f\"{num_tokens_from_messages(messages)} prompt tokens counted.\")\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# example token count from the OpenAI API\n",
    "response = openai.ChatCompletion.create(\n",
    "    model=MODEL,\n",
    "    messages=messages,\n",
    "    temperature=0,\n",
    ")\n",
    "\n",
    "print(f'{response[\"usage\"][\"prompt_tokens\"]} prompt tokens used.')\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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  }
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