2018-IJCAI-top3

This is 2018 IJCAI alimama Top3 Code. 3/5204
We open source parts of the code and explain all the feature engineering.

Introduction

CTR estimation problem is a classic and valuable problem in the field of advertising algorithms.At present, the industry has a more mature solution to the problem of CTR estimation in steady flow.
The problem of this competition is to find a stable and reliable way to estimate the CTR problem during the promotion period in abnormal traffic.
We make exploratory analysis of the data on the change of abnormal flow, and construct the characteristics of sales volume, price and display times.And based on analysis of the distribution of data, we have constructed four different training sets.Each training set utilizes an integrated learning and neural network model.
The constructed offline validation strategy is the last hour and last two hours of the morning for abnormal traffic, and the evaluation indicators are Auc and Logloss.

Feature Engineering

User-Item/Shop/Brand/City
User/Shop/Item portrait
Click Time Feature
High order interaction characteristics
Sequence Statistical Feature
Trick Feature

Model

Lightgbm
Xgboost
Catboost
GBDT+LR
NN (DeepFFM,DeepFM,FNN)