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  • IJCAI-15 Competition

    Providers : Tmall

    Posted : 2015.03.17

    #Participants : 2008


This competition aims to promote applications of advanced techniques from AI research to real-world problems. Contestants will have access to vast amount of data provided by Tmall.com, the largest B2C platform in China. Top three winners will be invited to present their results at an IJCAI workshop and get a chance to test their algorithms online.The goal is to apply advanced and sophisticated machine learning and data mining techniques to predict which shoppers would become repeat buyers after sales promotion in Tmall.com. The main differences from most other AI competitions in the past are listed below:

1. A large sales promotion data set for public usage
2. A free distributed computation platform for top teams
3. A great opportunity for winners to deploy algorithms online 

It is the time to demonstrate your brilliant ideas in the real world!

Problem Definition
Merchants sometimes run big promotions (e.g., discounts or cash coupons) on particular dates (e.g., Boxing-day Sales, "Black Friday" or "Double 11 (Nov 11th)" , in order to attract a large number of new buyers. Unfortunately, many of the attracted buyers are one-time deal hunters, and these promotions may have little long lasting impact on sales. To alleviate this problem, it is important for merchants to identify who can be converted into repeated buyers. By targeting on these potential loyal customers, merchants can greatly reduce the promotion cost and enhance the return on investment (ROI). It is well known that in the field of online advertising, customer targeting is extremely challenging, especially for fresh buyers. However, with the long-term user behavior log accumulated by Tmall.com, we may be able to solve this problem.

In this challenge, we provide a set of merchants and their corresponding new buyers acquired during the promotion on the "Double 11" day. Your task is to predict which new buyers for given merchants will become loyal customers in the future. In other words, you need to predict the probability that these new buyers would purchase items from the same merchants again within 6 months.

The competition consists of two stages:
- In the first stage, a data set containing around 200k users is given for training, while the other of similar size for testing. Similar to other competitions, you may extract any features, then perform training with additional tools. You need to only submit the prediction results for evaluation. 
- In the second stage, the top 50 teams from the first stage will have the opportunity to work on a much larger data set on Alibaba' s cloud platform. You will need to submit your code in JAVA, then the distributed computation will be handled by the cloud platform. 

Competition Rules
One account per participant: It is not allowed to register multiple accounts.

Submission limits: You may submit multiple results as you wish. However, the evaluation is only carried out in specified time slots (once in every 4 hours). 

No private sharing: It is not allowed to share code or data outside of teams. Nevertheless,you may share the code or ideas to all participants on the forums.  

Team merge: Team mergers can be performed between 5th-10th,May. There are at most 10 members (including the leader) in one team. After merging, the submission and leaderboard are only applicable for the leader' s account. Ranking of the rest team members will be erased on May 11th. When the contest ends, all members of the winning teams will receive electronic certificate issued by Tmall.com. Detail of team merging will be released later. 

Eligibility of winners: Top 3 teams of each stage must submit a report and their code to the organizer to be eligible for the award.

Important Dates
April 1, 2015: Competition announcement

April 15, 2015: Competition begins

May 15, 2015, 23:59 UTC: First Stage Competition ends 

May 20, 2015: Second Stage Competition begins

June 20, 2015, 23:59 UTC: Second Stage Competition ends 

June 30, 2015: Final result announcement

First stage

First Prize: 4,000USD

Second Prize: 3,000USD

Third Prize: 2,000USD

Second stage 
Only the top 50 teams at the first stage are qualified for the second stage.

First Prize: 6,000USD

Second Prize: 4,000USD

Third Prize: 2,000USD

The top 3 teams may present their solutions at the IJCAI workshop "Social Influence Analysis", with additional 3,000USD as registration and travelling allowance.

Extra Online Competition
The top 3 teams at the second stage will have the opportuntiy to deploy their algorithms on Tmall.com for the ' ' Double-11' ' promotion, 2015. And the winner will be awarded by 50,000USD.

Remark1: The problem would be related but different from the first two competitions. Detail will be announced before September 2015.

Remark2: Participants at this stage would work onsite as interns for around two months. Besides the award, salary and housing allowances will be also provided.