You R. Name

My name is Jiachen Hu (胡家琛), now working as an algorithm developer at ByteDance. I graduated from Peking University and received the PhD degree in 2025, where I am fortunate to be advised by Professor Liwei Wang, and spend wonderful times working with Chi Jin and Lihong Li remotely for past years. Before becoming a PhD candidate, I obtained my B.S. from Turing Class, Peking University.

I have broad interests in sample efficient reinforcement learning and online learning, especially the application-driven problems. In the past few years, my researches focused on statistically efficient bandits (e.g., multi-armed bandits, linear bandits), online exploration in structured MDPs/POMDPs, and understanding sim-to-real transfer. Please feel free to contact me if you are interested in my researches or having a chat with me!

My curriculum vitae can be found here. My WeChat can be found here.

news

Jan 15, 2016	A simple inline announcement with Markdown emoji!
Nov 07, 2015	A long announcement with details
Oct 22, 2015	A simple inline announcement.

latest posts

Mar 26, 2025	a post with plotly.js
Dec 04, 2024	a post with image galleries
May 14, 2024	Google Gemini updates: Flash 1.5, Gemma 2 and Project Astra

selected publications

PhysRev

Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?

A. Einstein^*†, B. Podolsky^*, and N. Rosen^*

Phys. Rev., New Jersey. More Information can be found here , May 1935

Abs DOI HTML PDF Video

In a complete theory there is an element corresponding to each element of reality. A sufficient condition for the reality of a physical quantity is the possibility of predicting it with certainty, without disturbing the system. In quantum mechanics in the case of two physical quantities described by non-commuting operators, the knowledge of one precludes the knowledge of the other. Then either (1) the description of reality given by the wave function in quantum mechanics is not complete or (2) these two quantities cannot have simultaneous reality. Consideration of the problem of making predictions concerning a system on the basis of measurements made on another system that had previously interacted with it leads to the result that if (1) is false then (2) is also false. One is thus led to conclude that the description of reality as given by a wave function is not complete.