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  {
   "cell_type": "markdown",
   "id": "7683b36a",
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   "source": [
    "# tiktoken (OpenAI) Length Function\n",
    "You can also use tiktoken, an open source tokenizer package from OpenAI to estimate tokens used. Will probably be more accurate for their models.\n",
    "\n",
    "1. How the text is split: by character passed in\n",
    "2. How the chunk size is measured: by `tiktoken` tokenizer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "1ad2d0f2",
   "metadata": {},
   "outputs": [],
   "source": [
    "# This is a long document we can split up.\n",
    "with open('../../../state_of_the_union.txt') as f:\n",
    "    state_of_the_union = f.read()\n",
    "from langchain.text_splitter import CharacterTextSplitter"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "825f7c0a",
   "metadata": {},
   "outputs": [],
   "source": [
    "text_splitter = CharacterTextSplitter.from_tiktoken_encoder(chunk_size=100, chunk_overlap=0)\n",
    "texts = text_splitter.split_text(state_of_the_union)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "ae35d165",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Madam Speaker, Madam Vice President, our First Lady and Second Gentleman. Members of Congress and the Cabinet. Justices of the Supreme Court. My fellow Americans.  \n",
      "\n",
      "Last year COVID-19 kept us apart. This year we are finally together again. \n",
      "\n",
      "Tonight, we meet as Democrats Republicans and Independents. But most importantly as Americans. \n",
      "\n",
      "With a duty to one another to the American people to the Constitution.\n"
     ]
    }
   ],
   "source": [
    "print(texts[0])"
   ]
  }
 ],
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