#PraCegoVer dataset

Automatically describing images using natural sentences is an essential task for visually impaired people's inclusion on the Internet. Although there are many datasets in the literature, most of them contain only English captions, whereas datasets with captions described in other languages are scarce.

PraCegoVer arose on the Internet, stimulating users from social media to publish images, tag #PraCegoVer, and add a short description of their content. Inspired by this movement, we have proposed the #PraCegoVer, a multi-modal dataset with Portuguese captions based on posts from Instagram. It is the first large dataset for image captioning in Portuguese with freely annotated images.

#PraCegoVer has 533,523 pairs with images and captions described in Portuguese collected from more than 14 thousand different profiles. Also, the average caption length in #PraCegoVer is 39.3 words and the standard deviation is 29.7.

New Release

We release pracegover_400k.json which contains 403,337 examples from the original dataset.json  after preprocessing and duplication removal. It is split into train, validation, and test with 242036, 80628, and 80673 examples, respectively.

Dataset Structure

#PraCegoVer dataset comprehends a main file dataset.json and a collection of compressed files named images.tar.gz.partX
containing the images. The file dataset.json comprehends a list of JSON objects with the attributes:

• user: anonymized user that made the post;
• filename: image file name;
• raw_caption: raw caption;
• caption: clean caption;
• date: post date.

Each instance in dataset.json is associated with exactly one image in the images directory whose filename is pointed by the attribute filename. Also, we provide a sample with five instances, so the users can download the sample to get an overview of the dataset before downloading it completely.

Download Instructions

If you just want to have an overview of the dataset structure, you can download sample.tar.gz. But, if you want to use the dataset, or any of its subsets (63k, 173k, and 400k), you must download all the files and run the following commands to uncompress and join the files:

cat images.tar.gz.part* > images.tar.gz
tar -xzvf images.tar.gz

Alternatively, you can download the entire dataset from the terminal using the python script download_dataset.py available in the PraCegoVer repository. In this case, first, you have to download the script and create an access token here. Then, you can run the following command to download and uncompress the image files:

python download_dataset.py --access_token=<your access token>