PyMuPDF4LLMLoader

This notebook provides a quick overview for getting started with PyMuPDF4LLM document loader. For detailed documentation of all PyMuPDF4LLMLoader features and configurations head to the GitHub repository.

Overview

Integration details

Class	Package	Local	Serializable	JS support
PyMuPDF4LLMLoader	langchain_pymupdf4llm	✅	❌	❌

Loader features

Source	Document Lazy Loading	Native Async Support	Extract Images	Extract Tables
PyMuPDF4LLMLoader	✅	❌	✅	✅

Setup

To access PyMuPDF4LLM document loader you'll need to install the langchain-pymupdf4llm integration package.

Credentials

No credentials are required to use PyMuPDF4LLMLoader.

To enable automated tracing of your model calls, set your LangSmith API key:

# os.environ["LANGSMITH_API_KEY"] = getpass.getpass("Enter your LangSmith API key: ")
# os.environ["LANGSMITH_TRACING"] = "true"

Installation

Install langchain_community and langchain-pymupdf4llm.

%pip install -qU langchain_community langchain-pymupdf4llm

Note: you may need to restart the kernel to use updated packages.

Initialization

Now we can instantiate our model object and load documents:

from langchain_pymupdf4llm import PyMuPDF4LLMLoader

file_path = "./example_data/layout-parser-paper.pdf"
loader = PyMuPDF4LLMLoader(file_path)

Load

docs = loader.load()
docs[0]

Document(metadata={'producer': 'pdfTeX-1.40.21', 'creator': 'LaTeX with hyperref', 'creationdate': '2021-06-22T01:27:10+00:00', 'source': './example_data/layout-parser-paper.pdf', 'file_path': './example_data/layout-parser-paper.pdf', 'total_pages': 16, 'format': 'PDF 1.5', 'title': '', 'author': '', 'subject': '', 'keywords': '', 'moddate': '2021-06-22T01:27:10+00:00', 'trapped': '', 'modDate': 'D:20210622012710Z', 'creationDate': 'D:20210622012710Z', 'page': 0}, page_content='\`\`\`\nLayoutParser: A Unified Toolkit for Deep\n\n## Learning Based Document Image Analysis\n\n\`\`\`\n\nZejiang Shen[1] (�), Ruochen Zhang[2], Melissa Dell[3], Benjamin Charles Germain\nLee[4], Jacob Carlson[3], and Weining Li[5]\n\n1 Allen Institute for AI\n\`\`\`\n              shannons@allenai.org\n\n\`\`\`\n2 Brown University\n\`\`\`\n             ruochen zhang@brown.edu\n\n\`\`\`\n3 Harvard University\n_{melissadell,jacob carlson}@fas.harvard.edu_\n4 University of Washington\n\`\`\`\n              bcgl@cs.washington.edu\n\n\`\`\`\n5 University of Waterloo\n\`\`\`\n              w422li@uwaterloo.ca\n\n\`\`\`\n\n**Abstract. Recent advances in document image analysis (DIA) have been**\nprimarily driven by the application of neural networks. Ideally, research\noutcomes could be easily deployed in production and extended for further\ninvestigation. However, various factors like loosely organized codebases\nand sophisticated model configurations complicate the easy reuse of important innovations by a wide audience. Though there have been on-going\nefforts to improve reusability and simplify deep learning (DL) model\ndevelopment in disciplines like natural language processing and computer\nvision, none of them are optimized for challenges in the domain of DIA.\nThis represents a major gap in the existing toolkit, as DIA is central to\nacademic research across a wide range of disciplines in the social sciences\nand humanities. This paper introduces LayoutParser, an open-source\nlibrary for streamlining the usage of DL in DIA research and applications. The core LayoutParser library comes with a set of simple and\nintuitive interfaces for applying and customizing DL models for layout detection, character recognition, and many other document processing tasks.\nTo promote extensibility, LayoutParser also incorporates a community\nplatform for sharing both pre-trained models and full document digitization pipelines. We demonstrate that LayoutParser is helpful for both\nlightweight and large-scale digitization pipelines in real-word use cases.\n[The library is publicly available at https://layout-parser.github.io.](https://layout-parser.github.io)\n\n**Keywords: Document Image Analysis · Deep Learning · Layout Analysis**\n\n    - Character Recognition · Open Source library · Toolkit.\n\n### 1 Introduction\n\n\nDeep Learning(DL)-based approaches are the state-of-the-art for a wide range of\ndocument image analysis (DIA) tasks including document image classification [11,\n\n')

import pprint

pprint.pp(docs[0].metadata)

{'producer': 'pdfTeX-1.40.21',
 'creator': 'LaTeX with hyperref',
 'creationdate': '2021-06-22T01:27:10+00:00',
 'source': './example_data/layout-parser-paper.pdf',
 'file_path': './example_data/layout-parser-paper.pdf',
 'total_pages': 16,
 'format': 'PDF 1.5',
 'title': '',
 'author': '',
 'subject': '',
 'keywords': '',
 'moddate': '2021-06-22T01:27:10+00:00',
 'trapped': '',
 'modDate': 'D:20210622012710Z',
 'creationDate': 'D:20210622012710Z',
 'page': 0}

Lazy Load

pages = []
for doc in loader.lazy_load():
    pages.append(doc)
    if len(pages) >= 10:
        # do some paged operation, e.g.
        # index.upsert(page)

        pages = []
len(pages)

from IPython.display import Markdown, display

part = pages[0].page_content[778:1189]
print(part)
# Markdown rendering
display(Markdown(part))

pprint.pp(pages[0].metadata)

{'producer': 'pdfTeX-1.40.21',
 'creator': 'LaTeX with hyperref',
 'creationdate': '2021-06-22T01:27:10+00:00',
 'source': './example_data/layout-parser-paper.pdf',
 'file_path': './example_data/layout-parser-paper.pdf',
 'total_pages': 16,
 'format': 'PDF 1.5',
 'title': '',
 'author': '',
 'subject': '',
 'keywords': '',
 'moddate': '2021-06-22T01:27:10+00:00',
 'trapped': '',
 'modDate': 'D:20210622012710Z',
 'creationDate': 'D:20210622012710Z',
 'page': 10}

The metadata attribute contains at least the following keys:

source
page (if in mode page)
total_page
creationdate
creator
producer

Additional metadata are specific to each parser. These pieces of information can be helpful (to categorize your PDFs for example).

Splitting mode & custom pages delimiter

When loading the PDF file you can split it in two different ways:

By page
As a single text flow

By default PyMuPDF4LLMLoader will split the PDF by page.

Extract the PDF by page. Each page is extracted as a langchain Document object:

loader = PyMuPDF4LLMLoader(
    "./example_data/layout-parser-paper.pdf",
    mode="page",
)
docs = loader.load()

print(len(docs))
pprint.pp(docs[0].metadata)

16
{'producer': 'pdfTeX-1.40.21',
 'creator': 'LaTeX with hyperref',
 'creationdate': '2021-06-22T01:27:10+00:00',
 'source': './example_data/layout-parser-paper.pdf',
 'file_path': './example_data/layout-parser-paper.pdf',
 'total_pages': 16,
 'format': 'PDF 1.5',
 'title': '',
 'author': '',
 'subject': '',
 'keywords': '',
 'moddate': '2021-06-22T01:27:10+00:00',
 'trapped': '',
 'modDate': 'D:20210622012710Z',
 'creationDate': 'D:20210622012710Z',
 'page': 0}

In this mode the pdf is split by pages and the resulting Documents metadata contains the page (page number). But in some cases we could want to process the pdf as a single text flow (so we don't cut some paragraphs in half). In this case you can use the single mode :

Extract the whole PDF as a single langchain Document object:

loader = PyMuPDF4LLMLoader(
    "./example_data/layout-parser-paper.pdf",
    mode="single",
)
docs = loader.load()

print(len(docs))
pprint.pp(docs[0].metadata)

1
{'producer': 'pdfTeX-1.40.21',
 'creator': 'LaTeX with hyperref',
 'creationdate': '2021-06-22T01:27:10+00:00',
 'source': './example_data/layout-parser-paper.pdf',
 'file_path': './example_data/layout-parser-paper.pdf',
 'total_pages': 16,
 'format': 'PDF 1.5',
 'title': '',
 'author': '',
 'subject': '',
 'keywords': '',
 'moddate': '2021-06-22T01:27:10+00:00',
 'trapped': '',
 'modDate': 'D:20210622012710Z',
 'creationDate': 'D:20210622012710Z'}

Logically, in this mode, the page (page_number) metadata disappears. Here's how to clearly identify where pages end in the text flow :

Add a custom pages_delimiter to identify where are ends of pages in single mode:

loader = PyMuPDF4LLMLoader(
    "./example_data/layout-parser-paper.pdf",
    mode="single",
    pages_delimiter="\n-------THIS IS A CUSTOM END OF PAGE-------\n\n",
)
docs = loader.load()

part = docs[0].page_content[10663:11317]
print(part)
display(Markdown(part))

The default pages_delimiter is \n-----\n\n. But this could simply be \n, or \f to clearly indicate a page change, or  for seamless injection in a Markdown viewer without a visual effect.

Extract images from the PDF

You can extract images from your PDFs (in text form) with a choice of three different solutions:

rapidOCR (lightweight Optical Character Recognition tool)
Tesseract (OCR tool with high precision)
Multimodal language model

The result is inserted at the end of text of the page.

Extract images from the PDF with rapidOCR:

%pip install -qU rapidocr-onnxruntime pillow

Note: you may need to restart the kernel to use updated packages.

from langchain_community.document_loaders.parsers import RapidOCRBlobParser

loader = PyMuPDF4LLMLoader(
    "./example_data/layout-parser-paper.pdf",
    mode="page",
    extract_images=True,
    images_parser=RapidOCRBlobParser(),
)
docs = loader.load()

part = docs[5].page_content[1863:]
print(part)
display(Markdown(part))

API Reference:RapidOCRBlobParser

Be careful, RapidOCR is designed to work with Chinese and English, not other languages.

Extract images from the PDF with Tesseract:

%pip install -qU pytesseract

Note: you may need to restart the kernel to use updated packages.

from langchain_community.document_loaders.parsers import TesseractBlobParser

loader = PyMuPDF4LLMLoader(
    "./example_data/layout-parser-paper.pdf",
    mode="page",
    extract_images=True,
    images_parser=TesseractBlobParser(),
)
docs = loader.load()

print(docs[5].page_content[1863:])

API Reference:TesseractBlobParser

Extract images from the PDF with multimodal model:

%pip install -qU langchain_openai

Note: you may need to restart the kernel to use updated packages.

import os

from dotenv import load_dotenv

load_dotenv()

True

from getpass import getpass

if not os.environ.get("OPENAI_API_KEY"):
    os.environ["OPENAI_API_KEY"] = getpass("OpenAI API key =")

from langchain_community.document_loaders.parsers import LLMImageBlobParser
from langchain_openai import ChatOpenAI

loader = PyMuPDF4LLMLoader(
    "./example_data/layout-parser-paper.pdf",
    mode="page",
    extract_images=True,
    images_parser=LLMImageBlobParser(
        model=ChatOpenAI(model="gpt-4o-mini", max_tokens=1024)
    ),
)
docs = loader.load()

print(docs[5].page_content[1863:])

API Reference:LLMImageBlobParser | ChatOpenAI

Extract tables from the PDF

With PyMUPDF4LLM you can extract tables from your PDFs in markdown format :

loader = PyMuPDF4LLMLoader(
    "./example_data/layout-parser-paper.pdf",
    mode="page",
    # "lines_strict" is the default strategy and
    # is the most accurate for tables with column and row lines,
    # but may not work well with all documents.
    # "lines" is a less strict strategy that may work better with
    # some documents.
    # "text" is the least strict strategy and may work better
    # with documents that do not have tables with lines.
    table_strategy="lines",
)
docs = loader.load()

part = docs[4].page_content[3210:]
print(part)
display(Markdown(part))

Working with Files

Many document loaders involve parsing files. The difference between such loaders usually stems from how the file is parsed, rather than how the file is loaded. For example, you can use open to read the binary content of either a PDF or a markdown file, but you need different parsing logic to convert that binary data into text.

As a result, it can be helpful to decouple the parsing logic from the loading logic, which makes it easier to re-use a given parser regardless of how the data was loaded. You can use this strategy to analyze different files, with the same parsing parameters.

from langchain_community.document_loaders import FileSystemBlobLoader
from langchain_community.document_loaders.generic import GenericLoader
from langchain_pymupdf4llm import PyMuPDF4LLMParser

loader = GenericLoader(
    blob_loader=FileSystemBlobLoader(
        path="./example_data/",
        glob="*.pdf",
    ),
    blob_parser=PyMuPDF4LLMParser(),
)
docs = loader.load()

part = docs[0].page_content[:562]
print(part)
display(Markdown(part))

API Reference:FileSystemBlobLoader | GenericLoader

API reference

For detailed documentation of all PyMuPDF4LLMLoader features and configurations head to the GitHub repository: https://github.com/lakinduboteju/langchain-pymupdf4llm

Document loader conceptual guide
Document loader how-to guides

Overview​

Integration details​

Loader features​

Setup​

Credentials​

Installation​

Initialization​

Load​

Lazy Load​

Splitting mode & custom pages delimiter​

Extract the PDF by page. Each page is extracted as a langchain Document object:​

Extract the whole PDF as a single langchain Document object:​

Add a custom pages_delimiter to identify where are ends of pages in single mode:​