README.md

---
language:
- fr
license: apache-2.0
size_categories:
- 1M<n<10M
task_categories:
- text2text-generation
tags:
- postocr
- ocr
dataset_info:
  features:
  - name: input
    dtype: string
  - name: output
    dtype: string
  splits:
  - name: train
    num_bytes: 5716780692
    num_examples: 4660739
  download_size: 3419064772
  dataset_size: 5716780692
configs:
- config_name: default
  data_files:
  - split: train
    path: data/train-*
---

# Synthetic OCR Correction Dataset
This dataset is a synthetic dataset generated for post-OCR correction tasks. It contains over 2,000,000 rows of French text pairs and follows the Croissant format. It is designed to train small language models (LLMs) for text correction.

## Description
To ensure the dataset closely resembles OCR-malformed texts, we applied various transformations randomly. This approach helps avoid the LLM identifying specific patterns and encourages it to select the correct word based on the surrounding context. Below are some of the transformations applied:

```bash

alterations = [
    lambda x: re.sub(r'[aeiouAEIOU]', '', x),  # Remove vowels
    lambda x: re.sub(r'\s+', ' ', x),          # Replace multiple spaces with a single space
    lambda x: re.sub(r'\b\w\b', '', x),        # Remove single letters
    lambda x: re.sub(r'[^\w\s]', '', x),       # Remove punctuation
    lambda x: ''.join(random.choice((char, '')) for char in x),  # Randomly drop characters
    lambda x: ' '.join([
        ''.join(random.sample(word, len(word))) if random.random() < X else word  # Scramble words with X% probability
        for word in x.split()
    ])  # Randomly scramble words
]

```

In addition to the transformations listed above, we also modify punctuation, add words, and create repetitions. Feel free to customize these transformations as needed.

## Recipe
Each word in the text has a 50% chance of being selected for alteration.
A random number of alterations is applied to the selected words.
In this release, between 10% and 50% of the words in each text can be altered.
We welcome community feedback to improve this dataset further. Please feel free to share your thoughts or suggestions!