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---
dataset_info:
features:
- name: __key__
dtype: string
- name: __url__
dtype: string
- name: jpg
dtype: image
splits:
- name: train
num_bytes: 1128223519
num_examples: 476118
download_size: 879225634
dataset_size: 1128223519
configs:
- config_name: default
data_files:
- split: train
path: data/train-*
license: gpl-3.0
---
# Dataset Summary
This is a simple dataset that I crawled (with labels) from the Internet.
As its title suggests, the dataset contains Captcha images.
One downloads and uses this dataset as usual:
```ipython
In [1]: from datasets import load_dataset
In [2]: dataset = load_dataset("phunc20/nj_biergarten_captcha)
```
The structure of the dataset is depicted in the following code
```ipython
In [3]: dataset
Out[3]:
DatasetDict({
train: Dataset({
features: ['__key__', '__url__', 'jpg'],
num_rows: 476118
})
})
In [4]: dataset["train"][0]["__key__"]
Out[4]: '001/2024-10-08T18:21:10.578994_y2jhuv'
In [5]: dataset["train"][0]["__url__"]
Out[5]: '/home/phunc20/git-repos/huggingface_hub/phunc20/nj_biergarten_captcha/001.tar'
In [6]: dataset["train"][0]["jpg"]
Out[6]: <PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=140x50>
```
- The `__key__` key's value contains part of the file's path; in particular,
the groundtruth Captcha (aka label) lies in this string,
which, in the above example, is `y2jhuv`, right after the understore sign `'_'`.
This retrieval pattern of label is universal across the entire dataset.
- One thing to notice is that the set of symbols appearing in this Captcha
dataset is `[a-z][1-9]`, or in Python's term, `string.ascii_lowercase + string.digits[1:]`.
`0` is excluded on purpose because this Captcha generator generates hard-to-distinguish
zeros and little-oh-s.
- The `__url__` key is normally of no interesting usage.
- The `"jpg"` key's value is a `PIL.Image` (obtained from the original JPEG file).
An immediate usage of the dataset is to train a Captcha cracker.
# Citation Information
```
@ONLINE{nj_biergarten_captcha,
author = "phunc20",
title = "nj_biergarten_captcha",
url = "https://huggingface.co/datasets/phunc20/nj_biergarten_captcha"
}
``` |