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I am David Yu-Tung Hui / 許宇同, and I develop model-free reinforcement learning algorithms.

My research goal is to create algorithms that learn about our world through interactions. I hope that these algorithms will one day help us discover new scientific knowledge. To achieve my goal, I work on Reinforcement Learning (RL) algorithms that formalize the learning-through-interaction process as an optimization problem. Specifically, I improve optimization in RL using insights from linear algebra and probability theory.

I've written two works on this theme:

1. Stabilizing Q-Learning for Continuous Control (MSc Thesis, 2022) showed that adding LayerNorm to critic networks prevented semi-gradient updates of the mean-squared temporal-difference error from diverging. Adding LayerNorm to DDPG solved high-dimensional continuous control tasks such as dog-run in DeepMind Control.

2. Double Gumbel Q-Learning (Spotlight @NeurIPS 2023) showed that Maximum-Entropy RL algorithms have two heteroscedastic Gumbel noise sources. Accounting for these noise sources improved the aggregate performance of SAC by 2x at 1M training timesteps.

In 2023, I graduated with an MSc from Mila, University of Montreal. I'm looking for opportunities where I can continue my research.

For more information about me, see:

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