Quora ML CodeSprint 2013

The Ultimate Quora Machine Learning Challenge

The contest has ended

Quora CodeSprints are one of our Trademark Contests. In these contests, you are working with real data from Quora. This gives you an insight of real-world problems Quora is trying to solve everyday.

The Prizes

  • The winner will get an office hour session with Adam D'Angelo.
  • Top 2 contestants will receive a copy of Best of Quora 2010-2012.
  • Top 5 contestants will win exclusive Quora T-shirts.
  • The best submission for every challenge will receive a copy of Best of Quora 2010-2012.


Quora uses a combination of machine learning algorithms and moderation to ensure high-quality content on the site. High question and answer quality has helped Quora distinguish itself from other Q&A sites on the web.

This contest hosts 3 machine learning challenges. The training and test data provided is sampled from real production data from Quora.

Here's a sample challenge, Quora Answer Classifier, for you to solve.


Quora has one of the best engineering teams in the valley and they are looking to add more hackers on their team. If you're interested in working at Quora, you can connect with the company once the contest is over.

Working at Quora

Our mission is to share and grow the world's knowledge. Join us.

The potential of this is huge. If we can execute on our mission we're going to make a big impact on the world.

We just need to get a smart group of people together that can get us there.

Make a positive impact on the world
Quora is a group of exceptionally talented people all working together to share and grow the world's knowledge. We believe our progress toward this mission will have a great long-term impact on the world. When people have access to more knowledge, they can make better decisions, find better jobs and do them better, solve problems in their life, raise their families better, and much more. Knowledge is important to the world and the downstream effects of increased access to it are huge.

This is going to be around forever
Much of the knowledge that we are surfacing will still be useful years or decades into the future. Every day, as our content base grows, Quora gets more useful to everyone. In support of this, we are a long-term focused company: we are not aiming for an acquisition and our goal is to build a sustainable independent business that can last forever. This means that your time spent here will not be wasted.

It's still the beginning
In the future Quora will be much bigger than it is today. The groundwork that is being laid now is especially important because its impact will be magnified as we scale up. Much of the fundamental work has yet to be done. Low-hanging fruit is everywhere. The vast majority of knowledge is still not on the internet -- that is the opportunity in front of us.


  • ML Libraries are available for you to use. Languages that support ML libraries are given here
  • Refer to the scoring documentation here.
  • This contest will appeal to programmers who're interested in machine learning challenge.
  • HackerRank admins decision will be final.
  • Please refrain from discussing strategy during the contest.
  • Any case of code plagiarism will result in disqualification of both the users from the contest. We've a fairly good plagiarism detector that works at the opcode level.
  • You can code directly on our interface. We support 20 major languages. You can have a look at the environment in which we run your code.
  • Quora reserves the right to use the ideas and code from all submissions to the contest.