Fan Yeliang (Leo Van)

Research Interest

• I am working on application of data science in security and risk.
• Also I am saturated with application of data science in agriculture and industry.

Education

• 2012.09 ~ 2015.03, Hebei University of Technology, M.S. in Information Management
• 2008.09 ~ 2012.07, Hebei University of Technology, B.S. in Business Administration

Work Experiences

1. 2020.08 ~ Present, Meituan, Inc. Risk Data Mining Expert
2. 2015.04 ~ 2020.08, JD.com, Inc. Senior Algorithm Engineer

Project Experiences

Security & Risk

2020.08 ~ Present, Risk Data Mining Expert

Intelligent Agriculture

2019.07 ~ 2020.08, Algorithm & Product Leader

• Intelligent Farming and Intelligent Poultry Solutions: Lead the conception and design of intelligent farming and intelligent poultry business models and technology solutions. Led algorithm and product team members to build the data and algorithm models, and design the prototype of SaaS and APP from 0 to 1, which achieves the full solution from MVP to the real production environment.
• Intelligent Environmental Control: Design and development of intelligent environmental control algorithms and solutions based on time series analysis, deep learning and reinforcement learning. The intelligent environmental control algorithm consists two parts: environment models and control models. It realizes the reuse of models for same crop and livestock in different environments. With the expert knowledge engine and machine learning algorithms, the control error of various environmental indicators has been reduced by 50%+ compared with the farmers while keep the regular yield of vegatable, and total average cost (including water, electricity, fertilizer and etc.) is reduced by 20%+. In the 24-hour Hackathon simulation challenge of the 2019 International Autonomous Greenhouse Challenge, we achieved 4/21 of artificial intelligence strategy methods and 9/21 of net profit in virtual tomato planting.
• Intelligent Eggs Collection: Design and development of an intelligent eggs collection device and algorithm based on computer vision and sensors. During the eggs collection process in cage raising mode, with the data collected by cameras and sensors, it achieves the eggs counting and the belonged cages identification with accuracy of 99%+. Through the belonged cages identification, it is possible to analyze egg-feed ratio accurately, providing strong data support for hens elimination and a more detailed data source for eggs traceability.

Daat (Complex Network & Knowledge Graph)

2018.04 ~ 2019.06, Project Leader

• Data Knowledge Engineering & Data QA System: Design and development of ontology of data warehouse, data market and data tools. Based on the ontology and the extracted knowledge, we build the knowledge base of data. We also develop the data QA system with techniques such as: intent classification, slot filling, query rewrite, ranking and question matching based on DSSM. Data QA system is aimed at improving the usability and convenience for users to make use of data warehouse and data market. It can also answer the questions related to data concept, data processing flow and data tools. The system serves 3000+ internal users, and manual service with data related problems is reduced by 50%+ with its help.
• Automatic Sensitive Information Identification：Development of automatic sensitive information identification for data warehouse, which helps to make data encryption policy. The model is based on the Wide & Deep network with meta-information of the data (e.g., table name, table comment, column name, column comment, etc.) and value-information of the data (e.g., the data values of every column). Building the Wide network with extracted traditional features and the Deep network with text features using Char Embedding + CNN, it achieves 95%+ of the F1-Score on test data.
• Large Scale Heterogeneous Network Embedding: Development of large scale (ten millions of vertexes and hundred millions of edges) heterogeneous network embedding algorithm. We implement the algorithm based on meta-path with rich business meanings, and provide the embedding results as features for other business models, including risk management, marketing and recommendation.
• Recommendation and Marketing based on User Network and User Behavior: Leveraging historical orders, we build a large heterogeneous network of users which contains users, address, goods, and etc. With the embedding results of this network, we develop an algorithm for candidates generation of recommendation, which achieves 20%+ improvement compared with traditional methods.

All Seeing Eyes (Chinese Address Analytics)

2015.04 ~ 2018.04, Project Leader

• Development of Chinese address analytics algorithms, including: segmentation, classification, integrity, POI identification and similarity (accuracy 90%+).
• Development of Address Profile System based on the basic algorithm engine. It increased the conversion rate of users by 30%+ in the offline payment service.
• Development of the anti-fraud and credit model based on the Chinese address analysis system. The anti-fraud model identified illegal encashment orders with 200,000 CNY/day, and more than 10 million users were granted credit with the credit model.
• This project has beed awarded the “Innovation Seed” prize of JingYa Cup Innovation Competition in JD.com ranking 20/378.
• Development of Enterprise Address Profile System based on the basic algorithm engine which serves for internal and external users with offline data and realtime query service on JD Enterprise Credit.
• Development of Rural Finance Service Station Location Selection Models based on the Address Profile System and rural finance business. It provides decision support for offline rural finance service station selection.

User Behavior Analytics

2017.10 ~ 2017.12, Algorithms Engineer

• Development of a user behavior representation method named on Behavior2Vec. Based on hierarchical clustering and depth search, a hybrid model for identifying user abnormal behavior is proposed. Compared with Bag of Words and N-GRAM methods, the number of abnormal users identified is 3+ times of traditional methods.

Mortgage Loan

2015.04 ~ 2015.10, Algorithms Engineer

• Development of a hybrid product life cycle identification model based on Bass Diffusion model, optimized time series similarity method and clustering method. It got an accuracy of 95%+ when identifying the excess inventory products, which helped to make loans goods pledge decisions and calculate the loan-to-value ratio.
• Development of product information fusion model and system with ElasticSearch which got 90%+ recognition accuracy and provided accurate and relevant information, such as price, etc.

Skills

Programing Languages

• Python:
• R:
• JavaScript / TypeScript:
• Rust:

Frameworks

• PyTorch:
• Spark:
• Qt:
• React:

Foreign Languages

• English: CET-6 518, fluent in speaking, reading and writing skillful in English.

Research Achievements

Papers

1. Zhou, F., Yin, H., Zhan, L., Li, H., Fan, Y., & Jiang, L. (2018). A Novel Ensemble Strategy Combining Gradient Boosted Decision Trees and Factorization Machine Based Neural Network for Clicks Prediction. In 2018 International Conference on Big Data and Artificial Intelligence (BDAI) (pp. 29-33). IEEE.
2. Li, J., Fan, Y.*, Xu, Y., & Feng, H. (2013). An Improved Forecasting Algorithm for Spare Parts of Short Life Cycle Products Based on EMD-SVM. In Information Science and Cloud Computing Companion (ISCC-C), 2013 International Conference on (pp. 722-727). IEEE.
3. Fan, Y., Li, J., Chu, C. (2014). IEAF: A Hybrid Method for Forecasting Short Life Cycle Spare Parts. Unpublished.

Patents

1. A kind of Chinese address segmenting method and system (CN 105159949, 2015)
2. Product inventory predicting method and product inventory predicting device (CN 106056239, 2016)
3. Data warehouse information processing method, device, system, medium (CN 109388637, 2018)
4. A kind of data processing method, device, equipment and medium (CN 110309235, 2019)
5. Method and apparatus for generating information (CN 110309235, 2019)

Technical Projects

• Technical Website: https://leovan.tech
• Github: https://github.com/leovan

1. Data Science Introduction With R: a getting started tutorial of data science based on R (in Chinese).
2. Data Science Introduction With Python: a getting started tutorial of data science based on Python (in Chinese).
3. Sci-Hub EVA: Sci-Hub EVA is a cross-platform Sci-Hub GUI application.
4. Duckling Chinese：Duckling Chinese is Python wrapper of duckling-fork-chinese based on Jpype1, which provides parsing service in Chinese of time, data, numeral, etc.
5. Hive Functions: useful custom Hive functions.
6. Cytoscape Manual: Cytoscape manual (Chinese Version).
7. Rasa Doc: Rasa document (Chinese Version).
8. Quarto Pseudocode Extension: A Quarto extension to render pseudocode for html and pdf document.
9. Quarto Watermark Extension: A Quarto extension to add watermark for html and pdf document.
10. Quarto Style Text Extension: A Quarto extension to render style text for html and pdf document.

Offline Version

Updated on: 2024-02-26