Zongheng Yang

I'm a PhD student in Berkeley's RISELab, where I'm advised by Ion Stoica and collaborate closely with Joe Hellerstein. I research applying advances in deep learning to computer systems.

In my previous life, I worked at Google Brain (TensorFlow & deep learning models; 2016-2017), Databricks (intern; 2014), and Twitter (intern; 2013). I received my Bachelors in CS and in math from UC Berkeley. During my undergrad, I worked on various big data systems in the AMPLab.

Publications

• Qd-tree: Learning Data Layouts for Big Data Analytics.
  Zongheng Yang, Badrish Chandramouli, Chi Wang, Johannes Gehrke, Yinan Li, Umar Farooq Minhas, Per-Ake Larson, Donald Kossmann, Rajeev Acharya.
  To appear in SIGMOD 2020.
• Deep Unsupervised Cardinality Estimation.
  Zongheng Yang, Eric Liang, Amog Kamsetty, Chenggang Wu, Yan Duan, Xi Chen, Pieter Abbeel, Joseph M. Hellerstein, Sanjay Krishnan, Ion Stoica.
  To appear in VLDB 2020. [arXiv] [code]
• Learning to Optimize Join Queries With Deep Reinforcement Learning.
  Sanjay Krishnan, Zongheng Yang, Ken Goldberg, Joseph Hellerstein, Ion Stoica.
  arXiv, 2018. [blog]
• Ray: A Distributed Framework for Emerging AI Applications.
  Philipp Moritz, Robert Nishihara, Stephanie Wang, Alexey Tumanov, Richard Liaw, Eric Liang, Melih Elibol, Zongheng Yang, William Paul, Michael I. Jordan, Ion Stoica.
  OSDI 2018.

Earlier Work

• Natural TTS Synthesis by Conditioning WaveNet on Mel Spectrogram Predictions.
  Jonathan Shen, Ruoming Pang, Ron J. Weiss, Mike Schuster, Navdeep Jaitly, Zongheng Yang, Zhifeng Chen, Yu Zhang, Yuxuan Wang, RJ Skerry-Ryan, Rif A. Saurous, Yannis Agiomyrgiannakis, Yonghui Wu.
  ICASSP 2018.
• Tacotron: Towards End-to-End Speech Synthesis.
  Yuxuan Wang, RJ Skerry-Ryan, Daisy Stanton, Yonghui Wu, Ron J. Weiss, Navdeep Jaitly, Zongheng Yang, Ying Xiao, Zhifeng Chen, Samy Bengio, Quoc Le, Yannis Agiomyrgiannakis, Rob Clark, Rif A. Saurous.
  INTERSPEECH 2017.
• ZipG: A Memory-efficient Graph Store for Interactive Queries.
  Anurag Khandelwal, Zongheng Yang, Evan Ye, Rachit Agarwal, Ion Stoica.
  SIGMOD 2017.
• Ernest: Efficient Performance Prediction for Large-Scale Advanced Analytics.
  Shivaram Venkataraman, Zongheng Yang, Michael Franklin, Benjamin Recht, Ion Stoica.
  NSDI 2016.
• SparkR: Scaling R Programs with Spark.
  Shivaram Venkataraman, Zongheng Yang, Davies Liu, Eric Liang, Hossein Falaki, Xiangrui Meng, Reynold Xin, Ali Ghodsi, Michael Franklin, Ion Stoica, Matei Zaharia.
  SIGMOD 2016 (industrial track).

Earlier Projects

• Ray: contributed a fault-tolerant and highly available control-state storage (chain-replicated redis).
• TensorFlow: my public work at Google Brain included working on TensorFlow. One of my contributions is a new checkpoint format with much better efficiency.
• Succinct/ZipG: a data store that queries directly on compressed files. I worked on ZipG, a distributed graph store on top that focuses on memory-efficiency.
• SparkR: an R front-end for Apache Spark. Talk: SparkR: Enabling Interactive Data Science at Scale. Spark Summit, June 2014, San Francisco.
• Apache Spark: I was a Spark contributor, mostly on Spark SQL.