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Warriors Team Members Warriors Team Members Hengxing Cai, Sun Yat-sen University, Guangdong Key Laboratory of Intelligent Transportation Systems (Team Leader) Runxing Zhong, Beihang University Chaohe Wang, Southwest Jiaotong University, Intel Ruihuan Zhou, Southwest Jiaotong University Kejie Zhou, University of Chinese Academy of Sciences Hongyun Lee, University of Chinese Academy of Sciences Kele Xu, National University of Defense Technology Zhifeng Gao, Peking University Renxin Zhong, Sun Yat-sen University, Guangdong Key Laboratory of Intelligent Transportation Systems Jiachen Luo, Sun Yat-sen University, Guangdong Key Laboratory of Intelligent Transportation Systems Yao Zhou, Chongqing University of Posts and Telecommunications, Tencent Ming Ding, Beijing China-Power Information Technology Co. Ltd Lang Li, ChinaTelecom Bestpay Co. Ltd Qiang Li, Fudan University Da Li, Beihang University Nan Jiang, Beihang University Xu Cheng, China Mobile Communications Corporation Shiwen Cui, Harbin Engineering University Hongfei Ye, Shanghai Jiao Tong University Jiawei Shen, Shanghai China-Cubee Information Technology Co. Ltd Background and Task Description Travel time prediction plays a very important role in traffic status monitoring. Estimate the next 2 hours average travel time based on historical and current traffic data. Framework Preprocessing → Feature engineer → Model → Ensemble Remove outliers Feature construction Simultaneous prediction Weighing trend filtering Feature selection Rolling Prediction Time series Preprocessing ¢ Remove Outliers (National Day: 10.1-10.7) ¢ Trend Filtering (missing data, outliers) 1 ‖� − �‖' + �‖��‖ 2 ' + Where x is output data, y is input data, � is smoothing parameter, and D is a second-order difference matrix. Feature Construction Road ID，Time of Day (hour, min), Day of week, Tollgate id, weekend or not Identity Feature Feature Construction Road ID，Time of Day (hour, min), Day of week, Tollgate id, weekend or not Identity Feature Wind speed, Air pressure, Temperature Weather Feature Feature Construction Road ID，Time of Day (hour, min), Day of week, Tollgate id, weekend or not Identity Feature Wind speed, Air pressure, Temperature Weather Feature Length, Width, Grade Network Feature Feature Construction Road ID，Time of Day (hour, min), Day of week, Tollgate id, weekend or Identity not Feature Wind speed, Air pressure, Temperature Weather Feature Length, Width, Grade Travel time & Network Time & Volume Volume Feature Feature 2 hours before (different size) Feature Construction Road ID，Time of Day (hour, min), Day of week, Tollgate id, weekend or not Identity Feature Wind speed, Air pressure, Temperature Max, Min, Mean, Weather Midian, Standard Feature Deviation, Kurtosis, Skewness Statistical Feature Length, Width, Grade Travel time & Network Time & Volume Volume Feature Feature 2 hours before (different size) Feature Construction Road ID，Time of Day (hour, min), Day of TOD-DOW, week, Road-Time, Tollgate id, weekend or Length- Identity Width, not Interaction Feature … Feature Wind speed, Air pressure, Temperature Max, Min, Mean, Weather Midian, Standard Feature Deviation, Kurtosis, Skewness Statistical Feature Length, Width, Grade Travel time & Volume 2 hours before Road Time & Volume (different size) Feature Feature Feature Selection For interaction feature: ¢ Removing features with low variance ¢ Feature selection using tree-based model (top 30%) Model ¢ Model1: Simultaneous Prediction (Xgboost) ¢ Model2: Rolling Prediction (Xgboost) ¢ Model3: Time Series Prediction (Arima) Cur r ent Wai t t o St ep dat a pr edi ct l engt h Step 1 Step 2 . Step 6 Rolling prediction Ensemble learning ¢ Result = 0.4*Model1 + 0.4*Model2 + 0.2*Model3 THANK YOU.
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