Pranav Dar — Updated On August 27th, 2021
Beginner Computer Vision Datasets Deep Learning Image Listicle NLP Research & Technology Text Unstructured Data


The key to getting better at deep learning (or most fields in life) is practice. Practice on a variety of problems – from image processing to speech recognition. Each of these problem has it’s own unique nuance and approach.

But where can you get this data? A lot of research papers you see these days use proprietary datasets that are usually not released to the general public. This becomes a problem, if you want to learn and apply your newly acquired skills.

If you have faced this problem, we have a solution for you. We have curated a list of openly available datasets for your perusal.

In this article, we have listed a collection of high quality datasets that every deep learning enthusiast should work on to apply and improve their skillset. Working on these datasets will make you a better data scientist and the amount of learning you will have will be invaluable in your career. We have also included papers with state-of-the-art (SOTA) results for you to go through and improve your models.


How to use these datasets?

First things first – these datasets are huge in size! So make sure you have a fast internet connection with no / very high limit on the amount of data you can download.

There are numerous ways how you can use these datasets. You can use them to apply various Deep Learning techniques. You can use them to hone your skills, understand how to identify and structure each problem, think of unique use cases and publish your findings for everyone to see!

The datasets are divided into three categories – Image Processing, Natural Language Processing, and Audio/Speech Processing.

Let’s dive into it!


Image Datasets


MNIST is one of the most popular deep learning datasets out there. It’s a dataset of handwritten digits and contains a training set of 60,000 examples and a test set of 10,000 examples. It’s a good database for trying learning techniques and deep recognition patterns on real-world data while spending minimum time and effort in data preprocessing.

Size: ~50 MB

Number of Records: 70,000 images in 10 classes

SOTADynamic Routing Between Capsules



COCO is a large-scale and rich for object detection, segmentation and captioning dataset. It has several features:

  • Object segmentation
  • Recognition in context
  • Superpixel stuff segmentation
  • 330K images (>200K labeled)
  • 1.5 million object instances
  • 80 object categories
  • 91 stuff categories
  • 5 captions per image
  • 250,000 people with keypoints

Size: ~25 GB (Compressed)

Number of Records: 330K images, 80 object categories, 5 captions per image, 250,000 people with key points


Bored with Datasets? Solve real life project on Deep Learning 


ImageNet is a dataset of images that are organized according to the WordNet hierarchy. WordNet contains approximately 100,000 phrases and ImageNet has provided around 1000 images on average to illustrate each phrase.

Size: ~150GB

Number of Records: Total number of images: ~1,500,000; each with multiple bounding boxes and respective class labels

SOTAAggregated Residual Transformations for Deep Neural Networks


Open Images Dataset

Open Images is a dataset of almost 9 million URLs for images. These images have been annotated with image-level labels bounding boxes spanning thousands of classes. The dataset contains a training set of 9,011,219 images, a validation set of 41,260 images and a test set of 125,436 images.

Size: 500 GB (Compressed)

Number of Records: 9,011,219 images with more than 5k labels

SOTA : Resnet 101 image classification model (trained on V2 data): Model checkpoint, Checkpoint readme, Inference code.



VQA is a dataset containing open-ended questions about images. These questions require an understanding of vision and language. Some of the interesting features of this dataset are:

  • 265,016 images (COCO and abstract scenes)
  • At least 3 questions (5.4 questions on average) per image
  • 10 ground truth answers per question
  • 3 plausible (but likely incorrect) answers per question
  • Automatic evaluation metric

Size: 25 GB (Compressed)

Number of Records: 265,016 images, at least 3 questions per image, 10 ground truth answers per question

SOTATips and Tricks for Visual Question Answering: Learnings from the 2017 Challenge


The Street View House Numbers (SVHN)

This is a real-world image dataset for developing object detection algorithms. This requires minimum data preprocessing. It is similar to the MNIST dataset mentioned in this list, but has more labelled data (over 600,000 images). The data has been collected from house numbers viewed in Google Street View.

Size: 2.5 GB

Number of Records: 6,30,420 images in 10 classes

SOTADistributional Smoothing With Virtual Adversarial Training




This dataset is another one for image classification. It consists of 60,000 images of 10 classes (each class is represented as a row in the above image). In total, there are 50,000 training images and 10,000 test images. The dataset is divided into 6 parts – 5 training batches and 1 test batch. Each batch has 10,000 images.

Size: 170 MB

Number of Records: 60,000 images in 10 classes

SOTAShakeDrop regularization



Fashion-MNIST consists of 60,000 training images and 10,000 test images. It is a MNIST-like fashion product database. The developers believe MNIST has been overused so they created this as a direct replacement for that dataset. Each image is in greyscale and associated with a label from 10 classes.

Size: 30 MB

Number of Records: 70,000 images in 10 classes

SOTARandom Erasing Data Augmentation


Natural Language Processing

IMDB Reviews

This is a dream dataset for movie lovers. It is meant for binary sentiment classification and has far more data than any previous datasets in this field. Apart from the training and test review examples, there is further unlabeled data for use as well. Raw text and preprocessed bag of words formats have also been included.

Size: 80 MB

Number of Records: 25,000 highly polar movie reviews for training, and 25,000 for testing

SOTALearning Structured Text Representations


Twenty Newsgroups

This dataset, as the name suggests, contains information about newsgroups. To curate this dataset, 1000 Usenet articles were taken from 20 different newsgroups. The articles have typical features like subject lines, signatures, and quotes.

Size: 20 MB

Number of Records: 20,000 messages taken from 20 newsgroups

SOTAVery Deep Convolutional Networks for Text Classification,



Sentiment140 is a dataset that can be used for sentiment analysis. A popular dataset, it is perfect to start off your NLP journey. Emotions have been pre-removed from the data. The final dataset has the below 6 features:

  • polarity of the tweet
  • id of the tweet
  • date of the tweet
  • the query
  • username of the tweeter
  • text of the tweet

Size: 80 MB (Compressed)

Number of Records: 1,60,000 tweets

SOTAAssessing State-of-the-Art Sentiment Models on State-of-the-Art Sentiment Datasets



Mentioned in the ImageNet dataset above, WordNet is a large database of English synsets. Synsets are groups of synonyms that each describe a different concept. WordNet’s structure makes it a very useful tool for NLP.

Size: 10 MB

Number of Records: 117,000 synsets is linked to other synsets by means of a small number of “conceptual relations.

SOTA : Wordnets: State of the Art and Perspectives


Yelp Reviews

This is an open dataset released by Yelp for learning purposes. It consists of millions of user reviews, businesses attributes and over 200,000 pictures from multiple metropolitan areas. This is a very commonly used dataset for NLP challenges globally.

Size: 2.66 GB JSON, 2.9 GB SQL and 7.5 GB Photos (all compressed)

Number of Records: 5,200,000 reviews, 174,000 business attributes, 200,000 pictures and 11 metropolitan areas

SOTAAttentive Convolution


The Wikipedia Corpus

This dataset is a collection of a the full text on Wikipedia. It contains almost 1.9 billion words from more than 4 million articles. What makes this a powerful NLP dataset is that you search by word, phrase or part of a paragraph itself.

Size: 20 MB

Number of Records: 4,400,000 articles containing 1.9 billion words

SOTABreaking The Softmax Bottelneck: A High-Rank RNN language Model


The Blog Authorship Corpus

This dataset consists of blog posts collected from thousands of bloggers and has been gathered from Each blog is provided as a separate file. Each blog contains a minimum of 200 occurrences of commonly used English words.

Size: 300 MB

Number of Records: 681,288 posts with over 140 million words

SOTACharacter-level and Multi-channel Convolutional Neural Networks for Large-scale Authorship Attribution


Machine Translation of Various Languages

This dataset consists of training data for four European languages. The task here is to improve the current translation methods. You can participate in any of the following language pairs:

  • English-Chinese and Chinese-English
  • English-Czech and Czech-English
  • English-Estonian and Estonian-English
  • English-Finnish and Finnish-English
  • English-German and German-English
  • English-Kazakh and Kazakh-English
  • English-Russian and Russian-English
  • English-Turkish and Turkish-English

Size: ~15 GB

Number of Records: ~30,000,000 sentences and their translations

SOTAAttention Is All You Need

Engage with real life projects on Natural Language Processing here

Audio/Speech Datasets

Free Spoken Digit Dataset

Another entry in this list for inspired by the MNIST dataset! This one was created to solve the task of identifying spoken digits in audio samples. It’s an open dataset so the hope is that it will keep growing as people keep contributing more samples. Currently, it contains the below characteristics:

  • 3 speakers
  • 1,500 recordings (50 of each digit per speaker)
  • English pronunciations

Size: 10 MB

Number of Records: 1,500 audio samples

SOTARaw Waveform-based Audio Classification Using Sample-level CNN Architectures


Free Music Archive (FMA)

FMA is a dataset for music analysis. The dataset consists of full-length and HQ audio, pre-computed features, and track and user-level metadata. It an an open dataset created for evaluating several tasks in MIR. Below is the list of csv files the dataset has along with what they include:

  • tracks.csv: per track metadata such as ID, title, artist, genres, tags and play counts, for all 106,574 tracks.
  • genres.csv: all 163 genre IDs with their name and parent (used to infer the genre hierarchy and top-level genres).
  • features.csv: common features extracted with librosa.
  • echonest.csv: audio features provided by Echonest (now Spotify) for a subset of 13,129 tracks.

Size: ~1000 GB

Number of Records: ~100,000 tracks

SOTALearning to Recognize Musical Genre from Audio



This dataset contains ballroom dancing audio files. A few characteristic excerpts of many dance styles are provided in real audio format. Below are a few characteristics of the dataset:

  • Total number of instances: 698
  • Duration: ~30 s
  • Total duration: ~20940 s

Size: 14GB (Compressed)

Number of Records: ~700 audio samples

SOTAA Multi-Model Approach To Beat Tracking Considering Heterogeneous Music Styles


Million Song Dataset

The Million Song Dataset is a freely-available collection of audio features and metadata for a million contemporary popular music tracks. Its purposes are:

  • To encourage research on algorithms that scale to commercial sizes
  • To provide a reference dataset for evaluating research
  • As a shortcut alternative to creating a large dataset with APIs (e.g. The Echo Nest’s)
  • To help new researchers get started in the MIR field

The core of the dataset is the feature analysis and metadata for one million songs. The dataset does not include any audio, only the derived features. The sample audio can be fetched from services like 7digital, using code provided by Columbia University.

Size: 280 GB

Number of Records: PS – its a million songs!

SOTAPreliminary Study on a Recommender System for the Million Songs Dataset Challenge



This dataset is a large-scale corpus of around 1000 hours of English speech. The data has been sourced from audiobooks from the LibriVox project. It has been segmented and aligned properly. If you’re looking for a starting point, check out already prepared Acoustic models that are trained on this data set at and language models, suitable for evaluation, at

Size: ~60 GB

Number of Records: 1000 hours of speech

SOTALetter-Based Speech Recognition with Gated ConvNets



VoxCeleb is a large-scale speaker identification dataset. It contains around 100,000 utterances by 1,251 celebrities, extracted from YouTube videos. The data is mostly gender balanced (males comprise of 55%). The celebrities span a diverse range of accents, professions and age. There is no overlap between the development and test sets. It’s an intriguing use case for isolating and identifying which superstar the voice belongs to.

Size: 150 MB

Number of Records: 100,000 utterances by 1,251 celebrities

SOTA : VoxCeleb: a large-scale speaker identification dataset


Analytics Vidhya Practice Problems

For your practice, we also provide real life problems and datasets to get your hands dirty. In this section, we’ve listed down the deep learning practice problems on our DataHack platform.


Twitter Sentiment Analysis

Hate Speech in the form of racism and sexism has become a nuisance on twitter and it is important to segregate these sort of tweets from the rest. In this Practice problem, we provide Twitter data that has both normal and hate tweets. Your task as a Data Scientist is to identify the tweets which are hate tweets and which are not.

Size: 3 MB

Number of Records: 31,962 tweets


Age Detection of Indian Actors

This is a fascinating challenge for any deep learning enthusiast. The dataset contains thousands of images of Indian actors and your task is to identify their age. All the images are manually selected and cropped from the video frames resulting in a high degree of variability interms of scale, pose, expression, illumination, age, resolution, occlusion, and makeup.

Size: 48 MB (Compressed)

Number of Records: 19,906 images in the training set and 6636 in the test set

SOTA: Hands on with Deep Learning – Solution for Age Detection Practice Problem


Urban Sound Classification

This dataset consists of more than 8000 sound excerpts of urban sounds from 10 classes. This practice problem is meant to introduce you to audio processing in the usual classification scenario.

Size: Training set – 3 GB (Compressed), Test set – 2 GB (Compressed)

Number of Records: 8732 labeled sound excerpts (<=4s) of urban sounds from 10 classes


If you are aware of other open datasets, which you recommend to people starting their journey on deep learning/ unstructured datasets, please feel free to suggest them along with the reasons, why they should be included.

If the reason is good, I’ll include them in the list. Let us know your experience with using any of these datasets in the comments section. And happy deep learning!

Not sure, how to start your Deep Learning Journey? Use our Learning Path for Deep Learning

Learnengage , compete and get hired!

About the Author

Pranav Dar
Pranav Dar

Senior Editor at Analytics Vidhya. Data visualization practitioner who loves reading and delving deeper into the data science and machine learning arts. Always looking for new ways to improve processes using ML and AI.

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29 thoughts on "25 Open Datasets for Deep Learning Every Data Scientist Must Work With"

Sujatha Sivaraman
Sujatha Sivaraman says: March 29, 2018 at 11:48 am
Thanks Pranav. This is indeed going to be useful to strengthen your practice Reply
Sunny Toms
Sunny Toms says: March 29, 2018 at 2:48 pm
Good work Pranav. This is good info for deep learning self learners. Thank you. Reply
Fredrik says: March 29, 2018 at 2:53 pm
Very good, thanks! Reply
Mithlesh Patel
Mithlesh Patel says: March 29, 2018 at 3:50 pm
Thankyou Pranav, very useful for self learners. Reply
Raghu S
Raghu S says: March 29, 2018 at 3:57 pm
Sir, where can I get medical image dataset. Please provide necessary information. Reply
N says: March 29, 2018 at 4:36 pm
Great job Pranav, very usefuil Reply
Manish says: March 29, 2018 at 5:55 pm
Great job Pranav. Keep it. Reply
Swapna says: March 29, 2018 at 6:24 pm
Thanks Pranav. Good info for self learners Reply
Mathias Müller
Mathias Müller says: March 30, 2018 at 2:40 am
A machine translation researcher here, Regarding the machine translation data set you present: You clearly have not researched this well. You link randomly to the WMT machine translation shared task of 2011, although there are 7 newer editions, including 2018 ( Also, the "Attention is All you Need" paper from Google is _not_ state of the art on the 2011 data you are describing, the paper only has results from the 2014 shared task), and only from English to German, and English to French. By the way, the data sets are of course not called "Machine Translation of European Languages". WMT data is comprised of several individual data sets, such as Europarl, JRC Aquis, News Commentary or OpenSubtitles. Please do your homework. Reply
Pranav Dar
Pranav Dar says: March 30, 2018 at 4:02 pm
Hi Raghu, You can try to find something on the UCI Machine Learning site. They have a few medical datasets there. Apart from that, the below GitHub link contains some datasets that you might find useful: Reply
Peter says: March 31, 2018 at 11:55 pm
Thank You! Reply
ahmed awaad
ahmed awaad says: April 01, 2018 at 4:33 am
we need dataset about link quality Reply
David says: April 02, 2018 at 1:16 am
We maintain this huge list of color-names: Could also be useful to categorise or name colors Reply
V V CHAKRADHAR says: April 02, 2018 at 9:31 pm
Hey Pranav , I am working on Resume Ranking . Can you help me with a good link !! Reply
Pranav Dar
Pranav Dar says: April 03, 2018 at 11:41 am
Hi Ahmed, Can you elaborate a little bit on what you mean by "link quality"? Reply
Pranav Dar
Pranav Dar says: April 03, 2018 at 11:42 am
Hi Mathias, Thanks for taking the time to read through the article and giving us your suggestions! We have updated the link for the machine translation set accordingly. Since the latest version has incorporated a few other languages as well, we have updated the name to reflect that. Reply
Pranav Dar
Pranav Dar says: April 03, 2018 at 12:26 pm
Hi VV, Are you looking for a dataset or a general benchmark? You can check out this article to see how a job site is using ML to find deserving and qualified candidates: Reply
Pranav Dar
Pranav Dar says: April 03, 2018 at 12:29 pm
Looks pretty intriguing. Thanks for sharing, David! Reply
Mathias Müller
Mathias Müller says: April 03, 2018 at 2:58 pm
Hi Pranav Thanks for your reply. In retrospect, I do not like the condescending tone of my comment, my apologies. I am mainly taking issue because of the strong title ("Data every data scientist MUST work with"). Let me try to explain things a bit more. The theme of your post is to present individual data sets, say, the MNIST digits. But for machine translation, people usually aggregate and blend different individual data sets. Your section about machine translation is misleading in that it suggests there is a self-contained data set called "Machine Translation of Various Languages". An actual data set for machine translation you could mention is OpenSubtitles: Or Europarl: Or the English Gigaword corpus (a monolingual resource): Or a very recent resource, ParaCrawl: Reply
Darryl Ricketts
Darryl Ricketts says: April 04, 2018 at 7:41 am
The Wiki Corpus you link to is pay; $245 for the complete dump. Reply
Pranav Dar
Pranav Dar says: April 05, 2018 at 5:03 pm
Hi Darryl, Thanks for pointing it out. We have replaced it with the open dataset link. Let me know if you're still facing any issue with the link. Reply
Morten Bjoernsvik
Morten Bjoernsvik says: April 07, 2018 at 10:55 pm
I prefer rest apis so I do not have to download: - 15K met stations around the globe the oldest data I've found is from 1937 - I wich my city had the same more than 1000 datasets updated daily. Reply
Pranav Dar
Pranav Dar says: April 09, 2018 at 2:21 pm
Hi Morten, Thanks for sharing these links! These datasets will be useful for our community as well. Reply
Prashnna says: April 18, 2018 at 8:33 pm
Those of whom are interested in the Devnagari dataset for character recognition can utilize this ( resource. It's bigger than MNIST. P.S. Devnagari script is famous in Indian Subcontinent. (Nepal, India, Bangladesh, etc.) Reply
Sachin says: May 06, 2018 at 12:28 am
Thanks for the useful information. Can you please provide the dataset for link prediction. Reply
Pranav Dar
Pranav Dar says: May 07, 2018 at 6:17 pm
Hi Sachin, Can you elaborate on the context around this? Reply
Vishaal says: May 08, 2018 at 2:43 am
Thanks, this is a great resource! Reply
Leo says: July 28, 2018 at 5:28 am
Bookmarked. Thanks a lot! One note: Wikipedia corpus is definitely bigger than 30MB :) Reply
Kunal jain
Kunal jain says: November 22, 2018 at 10:59 am
Hi, thank you for the given information.... Reply

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