langchain/docs/modules/indexes/document_loaders/examples/unstructured_file.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "20deed05",
   "metadata": {},
   "source": [
    "# Unstructured File Loader\n",
    "This notebook covers how to use Unstructured to load files of many types. Unstructured currently supports loading of text files, powerpoints, html, pdfs, images, and more."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "2886982e",
   "metadata": {},
   "outputs": [],
   "source": [
    "# # Install package\n",
    "!pip install \"unstructured[local-inference]\"\n",
    "!pip install \"detectron2@git+https://github.com/facebookresearch/detectron2.git@v0.6#egg=detectron2\"\n",
    "!pip install layoutparser[layoutmodels,tesseract]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "54d62efd",
   "metadata": {},
   "outputs": [],
   "source": [
    "# # Install other dependencies\n",
    "# # https://github.com/Unstructured-IO/unstructured/blob/main/docs/source/installing.rst\n",
    "# !brew install libmagic\n",
    "# !brew install poppler\n",
    "# !brew install tesseract\n",
    "# # If parsing xml / html documents:\n",
    "# !brew install libxml2\n",
    "# !brew install libxslt"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "af6a64f5",
   "metadata": {},
   "outputs": [],
   "source": [
    "# import nltk\n",
    "# nltk.download('punkt')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "79d3e549",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.document_loaders import UnstructuredFileLoader"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "2593d1dc",
   "metadata": {},
   "outputs": [],
   "source": [
    "loader = UnstructuredFileLoader(\"./example_data/state_of_the_union.txt\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "fe34e941",
   "metadata": {},
   "outputs": [],
   "source": [
    "docs = loader.load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "ee449788",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'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\\nLast year COVID-19 kept us apart. This year we are finally together again.\\n\\nTonight, we meet as Democrats Republicans and Independents. But most importantly as Americans.\\n\\nWith a duty to one another to the American people to the Constit'"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "docs[0].page_content[:400]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7874d01d",
   "metadata": {},
   "source": [
    "## Retain Elements\n",
    "\n",
    "Under the hood, Unstructured creates different \"elements\" for different chunks of text. By default we combine those together, but you can easily keep that separation by specifying `mode=\"elements\"`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "ff5b616d",
   "metadata": {},
   "outputs": [],
   "source": [
    "loader = UnstructuredFileLoader(\"./example_data/state_of_the_union.txt\", mode=\"elements\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "feca3b6c",
   "metadata": {},
   "outputs": [],
   "source": [
    "docs = loader.load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "fec5bbac",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[Document(page_content='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.', lookup_str='', metadata={'source': '../../state_of_the_union.txt'}, lookup_index=0),\n",
       " Document(page_content='Last year COVID-19 kept us apart. This year we are finally together again.', lookup_str='', metadata={'source': '../../state_of_the_union.txt'}, lookup_index=0),\n",
       " Document(page_content='Tonight, we meet as Democrats Republicans and Independents. But most importantly as Americans.', lookup_str='', metadata={'source': '../../state_of_the_union.txt'}, lookup_index=0),\n",
       " Document(page_content='With a duty to one another to the American people to the Constitution.', lookup_str='', metadata={'source': '../../state_of_the_union.txt'}, lookup_index=0),\n",
       " Document(page_content='And with an unwavering resolve that freedom will always triumph over tyranny.', lookup_str='', metadata={'source': '../../state_of_the_union.txt'}, lookup_index=0)]"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "docs[:5]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "672733fd",
   "metadata": {},
   "source": [
    "## Define a Partitioning Strategy\n",
    "\n",
    "Unstructured document loader allow users to pass in a `strategy` parameter that lets `unstructured` know how to partitioning the document. Currently supported strategies are `\"hi_res\"` (the default) and `\"fast\"`. Hi res partitioning strategies are more accurate, but take longer to process. Fast strategies partition the document more quickly, but trade-off accuracy. Not all document types have separate hi res and fast partitioning strategies. For those document types, the `strategy` kwarg is ignored. In some cases, the high res strategy will fallback to fast if there is a dependency missing (i.e. a model for document partitioning). You can see how to apply a strategy to an `UnstructuredFileLoader` below."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "767238a4",
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.document_loaders import UnstructuredFileLoader"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "9518b425",
   "metadata": {},
   "outputs": [],
   "source": [
    "loader = UnstructuredFileLoader(\"layout-parser-paper-fast.pdf\", strategy=\"fast\", mode=\"elements\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "645f29e9",
   "metadata": {},
   "outputs": [],
   "source": [
    "docs = loader.load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "60685353",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[Document(page_content='1', lookup_str='', metadata={'source': 'layout-parser-paper-fast.pdf', 'filename': 'layout-parser-paper-fast.pdf', 'page_number': 1, 'category': 'UncategorizedText'}, lookup_index=0),\n",
       " Document(page_content='2', lookup_str='', metadata={'source': 'layout-parser-paper-fast.pdf', 'filename': 'layout-parser-paper-fast.pdf', 'page_number': 1, 'category': 'UncategorizedText'}, lookup_index=0),\n",
       " Document(page_content='0', lookup_str='', metadata={'source': 'layout-parser-paper-fast.pdf', 'filename': 'layout-parser-paper-fast.pdf', 'page_number': 1, 'category': 'UncategorizedText'}, lookup_index=0),\n",
       " Document(page_content='2', lookup_str='', metadata={'source': 'layout-parser-paper-fast.pdf', 'filename': 'layout-parser-paper-fast.pdf', 'page_number': 1, 'category': 'UncategorizedText'}, lookup_index=0),\n",
       " Document(page_content='n', lookup_str='', metadata={'source': 'layout-parser-paper-fast.pdf', 'filename': 'layout-parser-paper-fast.pdf', 'page_number': 1, 'category': 'Title'}, lookup_index=0)]"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "docs[:5]"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8de9ef16",
   "metadata": {},
   "source": [
    "## PDF Example\n",
    "\n",
    "Processing PDF documents works exactly the same way. Unstructured detects the file type and extracts the same types of `elements`. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "8ca8a648",
   "metadata": {},
   "outputs": [],
   "source": [
    "!wget  https://raw.githubusercontent.com/Unstructured-IO/unstructured/main/example-docs/layout-parser-paper.pdf -P \"../../\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "686e5eb4",
   "metadata": {},
   "outputs": [],
   "source": [
    "loader = UnstructuredFileLoader(\"./example_data/layout-parser-paper.pdf\", mode=\"elements\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c90f0e94",
   "metadata": {},
   "outputs": [],
   "source": [
    "docs = loader.load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "6ec859d8",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[Document(page_content='LayoutParser : A Unified Toolkit for Deep Learning Based Document Image Analysis', lookup_str='', metadata={'source': '../../layout-parser-paper.pdf'}, lookup_index=0),\n",
       " Document(page_content='Zejiang Shen 1 ( (ea)\\n ), Ruochen Zhang 2 , Melissa Dell 3 , Benjamin Charles Germain Lee 4 , Jacob Carlson 3 , and Weining Li 5', lookup_str='', metadata={'source': '../../layout-parser-paper.pdf'}, lookup_index=0),\n",
       " Document(page_content='Allen Institute for AI shannons@allenai.org', lookup_str='', metadata={'source': '../../layout-parser-paper.pdf'}, lookup_index=0),\n",
       " Document(page_content='Brown University ruochen zhang@brown.edu', lookup_str='', metadata={'source': '../../layout-parser-paper.pdf'}, lookup_index=0),\n",
       " Document(page_content='Harvard University { melissadell,jacob carlson } @fas.harvard.edu', lookup_str='', metadata={'source': '../../layout-parser-paper.pdf'}, lookup_index=0)]"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "docs[:5]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f52b04cb",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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