---
license: mit
task_categories:
- text-generation
- question-answering
language:
- en
tags:
- pdf2dataset
- ocr
- chunked
size_categories:
- n<1K
configs:
- config_name: default
  data_files:
  - split: train
    path: data/train-*
dataset_info:
  features:
  - name: chunk_id
    dtype: string
  - name: text
    dtype: string
  - name: text_clean
    dtype: string
  - name: chapter
    dtype: string
  - name: section
    dtype: string
  - name: subsection
    dtype: string
  - name: images
    list: image
  - name: image_refs
    list: string
  - name: num_images
    dtype: int64
  - name: has_images
    dtype: bool
  - name: source_filename
    dtype: string
  - name: start_index
    dtype: int64
  - name: char_count
    dtype: int64
  splits:
  - name: train
    num_bytes: 26302876
    num_examples: 419
  download_size: 25996981
  dataset_size: 26302876
---

# EmpiresOfMedievalWestAfrica

Dataset created with [PDF2Dataset](https://github.com/svngoku/PDF2Dataset) -- OCR + structure-aware chunking pipeline.

## Dataset Summary

| Metric | Value |
|---|---|
| Total chunks | 419 |
| Avg chars/chunk | 665 |
| Avg images/chunk | 0.10 |
| Source files | 1 |
| Duplicates removed | 0 |
| Quality filtered | 4 |

## Schema

| Column | Type | Description |
|---|---|---|
| `chunk_id` | `string` | Unique identifier: `filename_chunk_N` |
| `text` | `string` | Raw markdown chunk with image refs |
| `text_clean` | `string` | Cleaned text without markdown formatting |
| `chapter` | `string` | H1 header active at chunk position |
| `section` | `string` | H2 header active at chunk position |
| `subsection` | `string` | H3+ header active at chunk position |
| `images` | `list[string]` | Base64 image data for images in chunk |
| `image_refs` | `list[string]` | Image reference IDs in chunk text |
| `num_images` | `int` | Number of images in chunk |
| `has_images` | `bool` | Whether chunk contains images |
| `source_filename` | `string` | Original source file name |
| `start_index` | `int` | Character offset in source document |
| `char_count` | `int` | Character count of chunk text |

## Source Files

| File | Chunks |
|---|---|
| `david_c._conrad_empires_of_medieval_west_africabook4me.org_.pdf` | 419 |

## Document Structure

Chapters found in the source documents:

- A Changeable King
- A Mix of Cultures
- A World Famous Arma
- Age Grade Societies
- Askiya Muhammad the Great
- BIBLIOGRAPHY
- CONNECTIONS
- CONTENTS
- Empires of Medieval West Africa
- Epilogue
- Ethnic Groups of the Ghana, Mali, and Songhay Empires
- HISTORY
- INDEX
- Introduction
- Making the Best of Life
- Mande Social Organization
- Mansa Musa the Great
- Mansa Musa's Pilgrimage
- Modern Mali
- Money Cowries
- Moroccan Firearms
- Muhammad and the Islamic Empire
- Other Influences
- RESOURCES: Books
- RESOURCES: Web Sites
- SOCIETY AND CULTURE
- SOME MALI BASICS
- Salt of the Sahara
- Secret Sites
- Sii Ali's Last Campaigns
- ... and 16 more

## Pipeline

This dataset was processed through the PDF2Dataset pipeline:

1. **OCR** -- Mistral OCR extracts text and images from PDF/image files
2. **Chunking** -- Structure-aware recursive splitting preserves document hierarchy
3. **Validation** -- Schema validation ensures every chunk has required fields
4. **Deduplication** -- Content-hash based dedup removes identical chunks
5. **Quality Filtering** -- Removes empty, too-short, or malformed chunks